CN204407016U - A kind of fuel assembly bottom nozzle of equilibrium core entrance coolant flow - Google Patents
A kind of fuel assembly bottom nozzle of equilibrium core entrance coolant flow Download PDFInfo
- Publication number
- CN204407016U CN204407016U CN201420836492.3U CN201420836492U CN204407016U CN 204407016 U CN204407016 U CN 204407016U CN 201420836492 U CN201420836492 U CN 201420836492U CN 204407016 U CN204407016 U CN 204407016U
- Authority
- CN
- China
- Prior art keywords
- flow
- lattice plate
- discharge orifice
- lower lattice
- fuel assembly
- 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.)
- Active
Links
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
Landscapes
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
Abstract
The utility model discloses a kind of fuel assembly bottom nozzle of equilibrium core entrance coolant flow, relate to pressurized-water reactor design field, the fuel assembly bottom nozzle of equilibrium core entrance coolant flow described in the utility model, comprise lower lattice plate, support frame and filtration, described lower lattice plate is positioned at described support frame top, described filtration is in the top of described lower lattice plate or bottom, described lower lattice plate runs through the guiding pore be provided with for installing fuel assembly guide pipe, for install fuel assembly gauge pipe instrument pore and for cooling medium circulation and the discharge orifice group that reallocates to flow, for reactor core lower area assignment of traffic uneven phenomenon on contour cross section that reactor core lower plate large discharge orifice jet causes, carried out structural design optimization, to obtain reactor core bottom cooling medium evenly flowing.
Description
Technical field
The utility model relates to pressurized-water reactor design field, particularly relates to a kind of fuel assembly bottom nozzle of equilibrium core entrance coolant flow.
Background technology
Pressurized-water reactor fuel assembly is made up of some fuel rods, guide pipe parts, gauge pipe parts, screen work, upper bottom nozzle etc. usually, wherein, bottom nozzle is as the important component part of fuel assembly skeleton, be one of main load bearing component of fuel assembly, its reliability directly affects the security of fuel assembly under operation, transport and running status.Simultaneously bottom nozzle is also important interface unit, its structural design to the operating performance of fuel assembly and and in-pile component compatibility have a direct impact.As the entrance of Core cooling agent, the hydraulic performance of bottom nozzle is also one of important indicator of its combination property, has material impact to reactor core entrance coolant flux distribution homogeneity, fuel assembly pressure drop.
By finding the analysis of existing fuel assembly bottom nozzle, each main fuel company of the world is the main performance considered in its high strength, low pressure drop, anti-foreign matter etc. in bottom nozzle design.The bottom nozzle design of current main flow can be divided into two classes.Primary load bearing structure and anti-foreign matter structure for representative with the DFBN bottom nozzle of Westinghouse Electric, unite two into one, use lattice plate under little discharge orifice by the first kind.Under little discharge orifice, the circulation of lattice plate is than low, maintain very strong anti-foreign matter ability and the intensity allowance of abundance, simultaneously by the Venturi tube patent (Authorization Notice No. CN100592434C) of Westinghouse Electric's core patented technology, when lower circulation than significantly reduce the pressure drop of lattice slab integral; Equations of The Second Kind is the mainstay thinking of other fuel corporation use at present, namely main structural bearing function is realized by the framed structure of high as far as possible circulation ratio, keep lower pressure drop simultaneously, guarantee higher filterableness by the filter screen of all kinds of characteristic or filter-plate structure with less pressure drop.
Above-mentioned existing two class bottom nozzle designs, its shortcoming existed is: lack the optimal design of distributing balanced flow.When cooling medium flows into fuel assembly by reactor core lower plate, flow is uneven.Just to the region of reactor core lower plate discharge orifice, form fluerics, flow is larger; In neighboring area, reactor core lower plate discharge orifice, form turbulent region, flow is less.In existing bottom nozzle design, bottom nozzle lattice plate all adopt pass identical, equally distributed discharge orifice, under this design form, when cooling medium is by distributing after bottom nozzle again, flow distribution is still owed evenly, easily produces laterally stream, increases the risk that erosion is lost in fuel rod vibration wearing and tearing.
Therefore, in order to solve this problem, those skilled in the art is devoted to the fuel assembly bottom nozzle developing a kind of equilibrium core entrance coolant flow.
Utility model content
Because the above-mentioned defect of prior art, technical problem to be solved in the utility model is to provide a kind of fuel assembly bottom nozzle of equilibrium core entrance coolant flow, for the unevenness of inlet flow rate, lattice plate arranges the discharge orifice of uneven distribution under bottom nozzle, realize the flow equilibrium after flow reallocation, reduce laterally stream, reduce the risk that fuel rod lost efficacy because of vibration abrasion.Bottom nozzle described in the utility model, except possessing basic supporting and location, low pressure drop, anti-foreign matter function, also possesses the flow equilibrium partition characteristic that the design of relatively existing bottom nozzle is more excellent.
For achieving the above object, the utility model provides a kind of fuel assembly bottom nozzle of equilibrium core entrance coolant flow, comprise lower lattice plate, support frame and filtration, described lower lattice plate is positioned at described support frame top, described filtration is in the top of described lower lattice plate or bottom, described lower lattice plate runs through the guiding pore be provided with for installing fuel assembly guide pipe, for install fuel assembly gauge pipe instrument pore and for cooling medium circulation and the discharge orifice group that reallocates to flow, it is characterized in that, described filtration, the flow distribution discrepancy equation that described lower lattice plate and described discharge orifice group thereof are configured to when flowing into according to cooling medium flows out flow.
Further, described discharge orifice group is made up of the discharge orifice that one group of shape of cross section is different, and the shape of cross section of described discharge orifice comprises triangle, square, pentagon, hexagon and circle; Corresponding described lower lattice plate central area, inlet flow rate is large compared with peripheral regions, the shape that described cross-sectional area is less is selected in described discharge orifice, in surrounding flow comparatively zonule, and the described discharge orifice shape that under selecting same holes characteristic dimension, described cross-sectional area is larger; Described hole characteristic size refers to the diameter of circular hole or the external diameter of a circle of non-circular hole.
Further, described discharge orifice group is made up of variform discharge orifice, one group of longitudinal cross-section, and described longitudinal cross-section shape comprises straight hole, both sides chamfering or two chamfering, internal diameter is step-like and the necking down hole of rounding off; Corresponding described lower lattice plate central area, inlet flow rate is large compared with peripheral regions, and the shape that described longitudinal cross-section area is less is selected in described discharge orifice, and in surrounding flow comparatively zonule, under same characteristic features size is selected in described discharge orifice, larger shape is amassed in longitudinal cross-section; Described hole characteristic size refers to the diameter of circular hole or the external diameter of a circle of non-circular hole.
Further, described lower lattice plate is square structure, and described lower lattice plate thickness is uneven, corresponding described lower lattice plate central area, and inlet flow rate is large compared with peripheral regions, and described lower lattice plate adopts the thickness large compared with surrounding; In surrounding flow comparatively zonule, described lower lattice plate adopts the thickness little compared with center.
Further, described filter plate is square structure, described filter plate is furnished with square opening, the chip of circular port or net formula filtration; Corresponding described lower lattice plate central area, inlet flow rate is large compared with peripheral regions, adopts the described filtration of larger flow resistance coefficient, in surrounding flow comparatively zonule, adopts the described filtration of less flow resistance coefficient.
Further, described filter plate thickness is 0.5mm ~ 10mm, is processed or plate stamping manufacture by panel machine, and described lower lattice plate and described filter plate are by weld or the mode such as riveted joint is connected.
Further, described filtration is for filtering band, and by band machine work or stamped, described filtration band is carried out Automatic manual transmission by the groove that described lower lattice plate is opened and is welded to connect.
Further, described hole characteristic size is between 4.5mm ~ 11mm.
In better embodiment of the present utility model, the fuel assembly bottom nozzle of a kind of equilibrium core entrance coolant flow described in the utility model, is formed primarily of the support frame of square lower lattice plate, lower lattice plate bottom and the filtration of lower lattice plate top or bottom; Described lower lattice plate runs through and is provided with guiding pore for installing fuel assembly guide pipe, instrument pore for installing fuel assembly gauge pipe and hole, discharge orifice group for cooling medium circulation with reallocate to flow.
Described discharge orifice hole group, wherein discharge orifice is different according to manufacturing process, and wherein the shape of cross section of discharge orifice can adopt difformity.Because discharge orifice shape of cross section is different, by affect cooling medium pass through after flow reallocate.Described pass can be triangle, square, pentagon, hexagon or circle etc., above-mentioned pass circulation area is different from the ratio of wetted perimeter, under same characteristic features size, above-mentioned pass its to the descending change of the flow restriction function of liquid coolant, cause coefficient of shock resistance different.Corresponding region, jet-core region place, reactor core lower plate large discharge orifice, inlet flow rate is comparatively large, and the shape of cross section that cross-sectional area is less can be selected in discharge orifice, increasing runoff restriction; In surrounding flow comparatively zonule, discharge orifice can select same characteristic features size down cross-sectional to amass larger shape, reduces flow restriction function, and after realizing the reallocation of bottom nozzle flow, the flow of cooling medium acts on more uniformly.
Described discharge orifice hole group, can be chosen as circular hole or non-circular hole, and hole characteristic size (circular hole aperture, other equilateral non-circular hole circumscribed circle diameter etc.) designs according to the distribution of reactor core entrance coolant flow.Corresponding region, jet-core region place, reactor core lower plate large discharge orifice, inlet flow rate is comparatively large, and discharge orifice can adopt less characteristic dimension, strengthens flow restriction function; Peripheral regions flow comparatively zonule, discharge orifice adopts larger characteristic dimension, relaxes flow restriction function.By the combination of different shaped jet holes and characteristic dimension, realize the assignment of traffic of cooling medium after the reallocation of bottom nozzle flow more even, reduce life of laterally miscarrying, reduce fuel rod vibration abrasion risk.Described hole characteristic size can be selected between 4.5mm ~ 11mm.
Described discharge orifice hole group, wherein the vertical sectional shape of discharge orifice can adopt difformity.Because longitudinal cross-section shape is different, by affect cooling medium pass through after flow reallocate.Described longitudinal cross-section shape, discharge orifice can be step-like or the necking down hole etc. of rounding off for simple straight hole, both sides chamfering or two chamfering, internal diameter, under same characteristic features size, according to analysis and test assessment, the ascending change of the flow restriction function of above-mentioned pass to liquid coolant.According to the size of different longitudinal cross-sections shape to cooling medium circulation stream quantitative limitation effect, be arranged into the region that uninterrupted is different, to realize the effect of balanced flow.
Described lower lattice plate, be square structure, its thickness can adopt off-gauge.Because the thickness of lower lattice plate has impact to a certain degree to the pressure drop that cooling medium circulates, the larger pressure drop of thickness is larger, and therefore at flow comparatively large regions, lower lattice plate adopts comparatively heavy thickness; In flow comparatively zonule, lower lattice plate adopts less thickness.Make the flow of cooling medium more even, thus reach the effect subtracting small cross flow.
Described filter plate, be square structure, thickness is 0.5mm ~ 10mm, it is furnished with square opening, circular port, profiled holes or other chip or net formula filtration.Circulation filtration designs for the distribution of reactor core entrance coolant flow, flow adopts the structure of larger flow resistance coefficient compared with the discharge orifice of large regions, strengthen flow restriction function, flow adopts the structure of less flow resistance coefficient compared with the discharge orifice of zonule, relaxes flow restriction function.By the combination of different flow resistances coefficient construction, realize flow reallocation within the scope of single subassembly, make the flow of cooling medium more even, thus reach the effect subtracting small cross flow.
Feature on above-mentioned discharge orifice hole group, lower lattice plate, filter plate can adopt one or more combinations to realize the more uniform object of assignment of traffic of the rear cooling medium of bottom nozzle flow reallocation.
The fuel assembly bottom nozzle of a kind of equilibrium core entrance coolant flow described in the utility model, advantage is as follows:
(1) the utility model is by different shape of cross section, longitudinal cross-section shape, characteristic dimension and the arrangement mode of hole, discharge orifice group on lattice plate under bottom nozzle, after bottom nozzle flow can be made to reallocate, cooling medium flow on contour cross section, reactor core porch is more even, reduce life of laterally miscarrying, weaken fuel rod and screen work vibration stimulus source, reduce fuel rod vibration abrasion risk.
(2) the utility model is by the uneven thickness distribution of lattice plate under bottom nozzle, after bottom nozzle flow can be made to reallocate, cooling medium flow on contour cross section, reactor core porch is more even, reduce life of laterally miscarrying, weaken fuel rod and screen work vibration stimulus source, reduce fuel rod vibration abrasion risk.
(3) the utility model is by the layout of the filter disc of different shape, size and the arrangement mode on filtration unit, filter screen or other filtration, after bottom nozzle flow can be made to reallocate, cooling medium flow on contour cross section, reactor core porch is more even, reduce life of laterally miscarrying, weaken fuel rod and screen work vibration stimulus source, reduce fuel rod vibration abrasion risk.
(4) bottom nozzle for nuclear fuel assembly that relates to of the utility model, by the combined crosswise of filtration on lower lattice plate current water hole and filtration unit, filters the foreign matter in cooling medium effectively; By the layout of discharge orifice on lower lattice plate, stress distribution is rationalized, meet Structural strength calls; By the pass pore diameter characteristics of discharge orifice on lower lattice plate, meet the functional requirement of low pressure drop; Simultaneously by filtration and the layout of the different resistance coefficients on the layout in uneven thickness of the different shape of lower lattice plate current water hole hole group and layout, lower lattice plate, filtration unit, the cooperation of three kinds of modes, realizes the more uniform object of reactor core entrance coolant flux distribution.
Be described further below with reference to the technique effect of accompanying drawing to design of the present utility model, concrete structure and generation, to understand the purpose of this utility model, characteristic sum effect fully.
Accompanying drawing explanation
Fig. 1 is that bottom nozzle described in the utility model and reactor core lower plate are assembled and cooling medium flows to schematic diagram;
Fig. 2 is reactor core lower plate vertical view described in the utility model;
Fig. 3 is the different area schematic of reactor core lower plate flow described in the utility model;
Fig. 4 is the front perspective view of a bottom nozzle described in the utility model preferred embodiment;
Fig. 5 is the reverse side perspective view of a bottom nozzle described in the utility model preferred embodiment;
Fig. 6 is the floor map of a lower lattice plate described in the utility model preferred embodiment;
Fig. 7 is the upward view of a bottom nozzle described in the utility model preferred embodiment;
Fig. 8 is the lower lattice plate cut-open view of a bottom nozzle described in the utility model preferred embodiment;
Name in accompanying drawing corresponding to Reference numeral is called: 1-bottom nozzle; 2-reactor core lower plate; 3-flow comparatively large regions; 4-flow comparatively zonule; 5-filter plate; Lattice plate under 6-; 7-support frame; 8-discharge orifice group; 9-filters band.
Embodiment
As shown in Figure 1, the bottom nozzle 1 in preferred embodiment of the present utility model, is arranged in reactor core lower plate 2, and cooling medium flows into bottom nozzle 1 by three (not shown) in reactor core lower plate 2 or four (as depicted in figs. 1 and 2) discharge orifices.As shown in Figure 3, be just flow comparatively large regions 3 to the region of discharge orifice in reactor core lower plate 2; Peripheral regions is flow comparatively zonule 4.
Embodiment 1:
As shown in Figure 4 and Figure 5, the bottom nozzle 1 of the preferred embodiment in the utility model, is made up of square filter plate 5, lower lattice plate 6 and support frame 7.Wherein the filter plate 5 of the superiors mainly plays filtering foreign matter, is processed or plate stamping manufacture by panel machine.Filter plate 5 is made up of frame, circular hole slab, lath etc., and the frame periphery of filter plate 5 coordinates with lower lattice plate size, and for the length of side is about the square of 180mm ~ 220mm, border width is about 5 ~ 10mm, and thickness is about 0.5 ~ 2mm.The circular hole slab of filter plate 5 is divided into 9 pieces, every block is distributed with the circular port that diameter is about 5 ~ 7mm, and this circular port plays the effect of anti-foreign matter on the one hand, and play the effect controlling flow on the other hand, the thickness of circular hole slab is about 0.5 ~ 2mm.The lath of filter plate 5 connects frame and circular hole slab, and the discharge orifice of lattice plate 6 under 4 deciles.Lath thickness is about 0.5 ~ 2mm, and width is about 1 ~ 1.5mm.Lower lattice plate 6 is processed by panel machine, and for the length of side is about the square of 180mm ~ 220mm, thickness is about 15 ~ 25mm, and lower lattice plate 6 has circular discharge orifice 8 by mach mode, and the diameter of discharge orifice 8 is about 9 ~ 15mm.Support frame 7 is manufactured by casting or mach mode, plays the effect of supporting.Lower lattice plate 6 and support frame 7 are by being welded to connect; Lower lattice plate 6 and filter plate 5 are by weld or the mode such as riveted joint is connected.
As can be seen from said structure, by offering less discharge orifice, aperture on the position of the corresponding flow of filter plate 5 compared with large regions 3, realize the effect of limited flow; The position of the corresponding flow of filter plate 5 compared with zonule 4 uses lath, reduces flow restriction function; Can flow equilibrium be optimized, anti-foreign matter function can be realized again.The pressure drop that bottom nozzle 1 is lower is ensure that by the discharge orifice 8 lower lattice plate 6 being offered larger aperture.
Said structure is a kind of design always, namely uses different filtrations in the zones of different of filter plate 5.At the filtration that flow uses characteristic dimension less compared with large regions 3, at the filtration that flow uses characteristic dimension larger compared with zonule 4.
Embodiment 2:
As shown in Figure 7, the bottom nozzle 1 of the preferred embodiment in the utility model, is made up of lower lattice plate 6, support frame 7, filtration band 9.
Wherein descend lattice plate 6 by panel machine processing and manufacturing, for the length of side is about the square of 180mm ~ 220mm, thickness is about 15 ~ 25mm, and lower lattice plate 6 has different circular discharge orifice 8, aperture by mach mode.As shown in Figure 6, discharge orifice 8 has 3 kinds of different pore sizes, and offer less discharge orifice, aperture 8 at flow compared with on large regions 3 correspondence position, aperture is about 5 ~ 7mm; Offer larger discharge orifice, aperture 8 at flow compared with on large regions 4 correspondence position, aperture is about 9 ~ 14mm; The discharge orifice 8 that aperture is about 7 ~ 9mm is offered at the intersection in these two regions.Filter band 9 by band machine work or stamped, filter band 9 thickness and be about 0.5 ~ 1.5mm, be arranged on larger discharge orifice, aperture 8,4 grades divide discharge orifice 8, play the effect of filtering foreign matter.Support frame 7 is manufactured by casting or mach mode, plays the effect of supporting.Lower lattice plate 6 and support frame 7 are by being welded to connect; Filter band 9 carry out Automatic manual transmission by the groove that lower lattice plate 6 is opened and be welded to connect.
As can be seen from said structure, by offering less discharge orifice, aperture 8 on the position of the corresponding flow of lower lattice plate 6 compared with large regions 3, realize the effect of limited flow; Offer larger discharge orifice, aperture 8 at the corresponding flow of filter plate 5 compared with the position of zonule 4, reduce flow restriction function; By the cooperation of different pore size discharge orifice, both ensure comparatively low pressure drop, realize the function optimizing flow equilibrium simultaneously.And filter band 9 by installing at larger discharge orifice place, realize the effect of filtering foreign matter; Less discharge orifice 8, aperture inherently has the function of anti-foreign matter.
Said structure is another kind of design, namely utilizes zones of different on lower lattice plate 6 to use the discharge orifice 8 of different pore size.In the discharge orifice 8 that flow uses characteristic dimension less compared with large regions 3, in the discharge orifice 8 that flow uses characteristic dimension larger compared with zonule 4.
Embodiment 3:
The present embodiment difference from Example 2 is, the thickness of described lower lattice plate 6 is different.Lower lattice plate 6 adopts different thickness in zones of different.As shown in Figure 8, lower lattice plate 6 flow comparatively large regions 3 correspondence position adopt comparatively heavy thickness, be about 22 ~ 26mm; Adopt less thickness at flow compared with zonule 4 correspondence position, be about 18 ~ 22mm.The lower lattice plate 6 of said structure, both improve bearing strength, realized again the effect optimizing assignment of traffic.Thicker region can adopt illustrated trapezium structure and circular configuration.
As mentioned above, just can realize the utility model preferably, but above-described embodiment is only and realizes representative configurations of the present utility model.For strengthening effect of the present utility model, structure composition several in above-described embodiment can be used in implementation process, also can make otherwise to carry out the adjustment of coefficient of shock resistance according to principle of the present utility model thus reach balanced flow, reduce reactor core entrance laterally stream, reduce the object of fuel assembly fuel rod and screen work band Flow vibration, thus strengthen the safety and reliability of fuel assembly.
More than describe preferred embodiment of the present utility model in detail.Should be appreciated that the ordinary skill of this area just can make many modifications and variations according to design of the present utility model without the need to creative work.Therefore, all technician in the art according to design of the present utility model on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should by the determined protection domain of claims.
Claims (8)
1. the fuel assembly bottom nozzle of an equilibrium core entrance coolant flow, comprise lower lattice plate, support frame and filtration, described lower lattice plate is positioned at described support frame top, described filtration is in the top of described lower lattice plate or bottom, described lower lattice plate runs through the guiding pore be provided with for installing fuel assembly guide pipe, for install fuel assembly gauge pipe instrument pore and for cooling medium circulation and the discharge orifice group that reallocates to flow, it is characterized in that, described filtration, the flow distribution discrepancy equation that described lower lattice plate and described discharge orifice group thereof are configured to when flowing into according to cooling medium flows out flow.
2. the fuel assembly bottom nozzle of a kind of equilibrium core entrance coolant flow as claimed in claim 1, it is characterized in that, described discharge orifice group is made up of the discharge orifice that one group of shape of cross section is different, and the shape of cross section of described discharge orifice comprises triangle, square, pentagon, hexagon and circle; Corresponding described lower lattice plate central area, inlet flow rate is large compared with peripheral regions, the shape that described cross-sectional area is less is selected in described discharge orifice, in surrounding flow comparatively zonule, and the described discharge orifice shape that under selecting same holes characteristic dimension, described cross-sectional area is larger; Described hole characteristic size refers to the diameter of circular hole or the external diameter of a circle of non-circular hole.
3. the fuel assembly bottom nozzle of a kind of equilibrium core entrance coolant flow as claimed in claim 1, it is characterized in that, described discharge orifice group is made up of variform discharge orifice, one group of longitudinal cross-section, and described longitudinal cross-section shape comprises straight hole, both sides chamfering or two chamfering, internal diameter is step-like and the necking down hole of rounding off; Corresponding described lower lattice plate central area, inlet flow rate is large compared with peripheral regions, and the shape that described longitudinal cross-section area is less is selected in described discharge orifice, and in surrounding flow comparatively zonule, under same characteristic features size is selected in described discharge orifice, larger shape is amassed in longitudinal cross-section; Described hole characteristic size refers to the diameter of circular hole or the external diameter of a circle of non-circular hole.
4. the fuel assembly bottom nozzle of a kind of equilibrium core entrance coolant flow as claimed in claim 1, it is characterized in that, described lower lattice plate is square structure, described lower lattice plate thickness is uneven, corresponding described lower lattice plate central area, inlet flow rate is large compared with peripheral regions, and described lower lattice plate adopts the thickness large compared with surrounding; In surrounding flow comparatively zonule, described lower lattice plate adopts the thickness little compared with center.
5. the fuel assembly bottom nozzle of a kind of equilibrium core entrance coolant flow as claimed in claim 1, it is characterized in that, described filter plate is square structure, described filter plate is furnished with square opening, the chip of circular port or net formula filtration; Corresponding described lower lattice plate central area, inlet flow rate is large compared with peripheral regions, adopts the described filtration of larger flow resistance coefficient, in surrounding flow comparatively zonule, adopts the described filtration of less flow resistance coefficient.
6. the fuel assembly bottom nozzle of a kind of equilibrium core entrance coolant flow as claimed in claim 5, it is characterized in that, described filter plate thickness is 0.5mm ~ 10mm, is processed or plate stamping manufacture by panel machine, and described lower lattice plate and described filter plate are by weld or the mode such as riveted joint is connected.
7. the fuel assembly bottom nozzle of a kind of equilibrium core entrance coolant flow as claimed in claim 5, it is characterized in that, described filtration is for filtering band, and by band machine work or stamped, described filtration band is carried out Automatic manual transmission by the groove that described lower lattice plate is opened and is welded to connect.
8. the fuel assembly bottom nozzle of a kind of equilibrium core entrance coolant flow as claimed in claim 3, it is characterized in that, described hole characteristic size is between 4.5mm ~ 11mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420836492.3U CN204407016U (en) | 2014-12-19 | 2014-12-19 | A kind of fuel assembly bottom nozzle of equilibrium core entrance coolant flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420836492.3U CN204407016U (en) | 2014-12-19 | 2014-12-19 | A kind of fuel assembly bottom nozzle of equilibrium core entrance coolant flow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204407016U true CN204407016U (en) | 2015-06-17 |
Family
ID=53430856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420836492.3U Active CN204407016U (en) | 2014-12-19 | 2014-12-19 | A kind of fuel assembly bottom nozzle of equilibrium core entrance coolant flow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204407016U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538064A (en) * | 2014-12-19 | 2015-04-22 | 上海核工程研究设计院 | Fuel assembly lower pipe seat for balancing flow rate of coolant at reactor core inlet |
| CN109935351A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of fuel assembly and its bottom nozzle and bottom device |
-
2014
- 2014-12-19 CN CN201420836492.3U patent/CN204407016U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538064A (en) * | 2014-12-19 | 2015-04-22 | 上海核工程研究设计院 | Fuel assembly lower pipe seat for balancing flow rate of coolant at reactor core inlet |
| CN104538064B (en) * | 2014-12-19 | 2017-05-31 | 上海核工程研究设计院 | A kind of fuel assembly bottom nozzle of equilibrium core entrance coolant flow |
| CN109935351A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of fuel assembly and its bottom nozzle and bottom device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104538064A (en) | Fuel assembly lower pipe seat for balancing flow rate of coolant at reactor core inlet | |
| CN201353446Y (en) | Filter cloth and filter press device of plate and frame filter press | |
| CN207591421U (en) | A kind of multistage filtering y-type filter | |
| CN204407016U (en) | A kind of fuel assembly bottom nozzle of equilibrium core entrance coolant flow | |
| CN105327621A (en) | End component, hollow fiber membrane module and membrane filter unit | |
| CN102867547A (en) | Lower pipe seat and bottom device of light-water reactor nuclear fuel assembly | |
| CN102750991B (en) | The down pipe base for nucleus fuel component of a kind of band filter plate and filter plate complete processing thereof | |
| CN103247351A (en) | Low-pressure-drop foreign matter prevention type lower pipe seat of fuel assembly | |
| CN202650556U (en) | Nuclear fuel assembly lower tube socket with filter plate | |
| CN202650555U (en) | Nuclear fuel assembly lower tube socket foreign matter preventing plate for efficient foreign matter filtering | |
| CN204683932U (en) | A kind of dry-touch type diaper | |
| CN202356030U (en) | Support plate for flat plate membrane element, flat plate membrane element and flat plate membrane component | |
| CN211246477U (en) | Concentrated nitric acid bleaching tower divides acid dish | |
| CN205663482U (en) | Filter | |
| CN208626747U (en) | A kind of water filter being conveniently replaceable filter core | |
| CN209302287U (en) | A kind of filter core of multistage filtering | |
| CN207861057U (en) | A kind of oil tank of oil truck | |
| KR101371719B1 (en) | Fuel filter for vehicle | |
| CN108970194B (en) | Non-woven fabrics filters water tank | |
| CN205109149U (en) | Special lamination of filter | |
| CN206198817U (en) | A kind of diesel car transmission filter | |
| CN203089046U (en) | Dish washing machine and filtering system and lifting cup thereof | |
| CN105927324B (en) | Filter | |
| CN213537461U (en) | Composite filter element structure | |
| CN204407015U (en) | A kind of fuel assembly bottom nozzle of dual anti-foreign matter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE |
|
| CP01 | Change in the name or title of a patent holder |