CN103337262A - A kind of bottom nozzle with filtration foreign matter function - Google Patents

Abstract

The invention discloses a kind of bottom nozzle that filters the foreign matter function that has, comprise blade and some axis rib assembly parallel to each other that some axis are parallel to each other, the axis of described rib assembly and the axis of blade are orthogonal; The rib assembly is made of the rib of two symmetries, and the face that two ribs are relative has the draw-in groove corresponding with blade quantity separately, and described blade is installed in the draw-in groove; Described blade comprises the projection piece of some protrusion direction unanimities, connected by straight section between adjacent two projection pieces, straight section upper surface and lower surface all have groove, and the opening direction of described groove and the protrusion direction of projection piece are orthogonal, and the rib assembly is installed in the groove.This bottom nozzle all has good performance aspect structural strength, filtration capacity, the cooling medium pressure drop three.

Description

A kind of bottom nozzle with filtration foreign matter function

Technical field

The invention belongs to a kind of of reactor fuel assemblies bottom nozzle, specifically refer to a kind of bottom nozzle that filters the foreign matter function that has.

Background technology

Bottom nozzle is the lower junction member of reactor fuel assemblies, the function of supporting, location and distribution coolant flow is provided for fuel assembly, in addition, because during reactor operation, through fuel assembly, the foreign matter that may contain in the cooling medium can cause damage to fuel rod to cooling medium with very fast velocity flow, cause fuel rod that damaged risk takes place, in order to limit this risk, bottom nozzle need have the function of filtering foreign matter, flows in the fuel assembly to avoid foreign matter.

Existing bottom nozzle, rigidity and the intensity of its filtration fraction structure are limited, and structural strength and the rigidity of bottom nozzle are brought negative effect, under the load-up condition of strictness, cause the bottom nozzle distortion excessive easily, even generation are caved in.

Summary of the invention

The purpose of this invention is to provide a kind of bottom nozzle that is suitable for reactor fuel assemblies, make this bottom nozzle can accomplish good balance and can further promote in the performance aspect structural strength and the cooling medium pressure drop in the performance aspect structural strength, filtration capacity, the cooling medium pressure drop three, thereby improve the overall performance of fuel assembly, a kind of bottom nozzle that filters the foreign matter function that has namely is provided.

Implementation of the present invention is as follows: a kind of bottom nozzle with filtration foreign matter function, comprise some blades, and described blade comprises the projection piece of some protrusion direction unanimities, is connected by straight section between adjacent two projection pieces.Projection piece comprises planar member and is arranged on the projection of planar member one side.It is fairshaped projection that the projection ordinary priority is used crowning, for example the projection of sphere shape.Straight-line segment between the projection piece can guarantee that it is subjected to parallel this straight-line segment of process of force direction energy, to reduce the stressed of blade in its filtration, adopt fairshaped projection simultaneously, also can further disperse its from the top vertical direction or below vertical direction stressed.

Also comprise some and the rib assembly blade clamping, the crisscross formation network that arranges of described rib assembly and blade.The rib assembly is used for fixed blade, adopts snap fit, but auxiliary blade and fixed blade are not out of shape it and are offset.

The rib assembly constitutes being much of rib and following rib by two, and the face that last rib is relative with following rib has the draw-in groove corresponding with blade quantity separately; Straight section upper surface and lower surface all have groove, and the opening direction of described groove and the protrusion direction of projection piece are orthogonal; Last rib is positioned at the blade top, and groove of the draw-in groove of rib and straight section upper surface is connected together on it, and following rib is positioned at the blade below, and draw-in groove of rib and the groove of straight section lower surface are connected together under it.The present invention will go up rib and following rib and extend to zone between the blade, and form and connect structure up and down, further guarantee its intensity, can also form the runner that filters foreign matter with blade simultaneously.

The described end face width of going up rib along the opening direction of draw-in groove ascending arrive again little.

The square section of described projection piece is arc surfaced.

Adopt to seamlessly transit between straight section and the projection piece and be connected.

Also comprise framework, the two ends of rib assembly and the two ends of blade all are embedded on the framework.

Described framework also is connected with supporting leg.

Also comprise supporting base, described supporting base is arranged in the framework, and the axis of supporting base is vertical with the framework upper surface.

Also comprise supporting base, described supporting base is embedded between the two adjacent blades between the Huo and adjacent two rib assemblies, and the axis of supporting base is vertical with the framework upper surface.

Also comprise supporting base, described supporting base is embedded on the rib assembly, and the axis of supporting base is vertical with the framework upper surface.

The position of supporting base arranges, be with gauge pipe and guide pipe as the reference standard, in theory, supporting base is the optional position that can be arranged in the framework.Pay the utmost attention on structural strength and be installed on the rib assembly, therefore require supporting base preferentially to be embedded on the rib assembly.

The orthogonal formation grid of the axis of described rib assembly and the axis of blade, last rib and following rib clamp blade from the above and below of blade respectively, for conserve space, wherein the straight section upper surface of blade and lower surface all have groove, the draw-in groove of going up the draw-in groove of rib and following rib like this can be respectively from both direction interlock groove, make that going up rib is embedded in the blade with following rib, conserve space, the mode that adopts above-mentioned interlock to inlay simultaneously can make blade the vertical and horizontal direction with respect on rib and following rib must not move, to form criss-cross fastener, strengthened fixed function.

Based on said structure, the present invention is directed to the problem that prior art exists aspect structural strength, filtration capacity, cooling medium pressure drop three, provide a kind of performance better bottom nozzle, it adopts the blade of being made up of a plurality of cambered surface projection pieces, blade with neat and symmetrical being arranged in together of a determining deviation, is formed the runner that can filter foreign matter between two parallel projection pieces on two adjacent blades; And use the identical symmetrically arranged upward rib of two root architectures and following rib to clamp blade from both direction up and down and the gap between blade adjacent protrusion part of blade respectively, runner between two adjacent blades further is divided into the runner of single complete closed, can strengthens filtering function and can reduce the cooling medium pressure drop; In order to increase structural strength, supporting base is embedded in the assembly of being made up of blade and rib assembly, for guide pipe and the gauge pipe of fuel assembly provides mounting structure; The combinations thereof body is fixed by framework, and namely the two ends of the two ends of rib assembly and blade all are embedded on the framework, and above-mentioned total is supported by supporting leg; Above total fully in conjunction with as a whole, is namely become bottom nozzle.

Among the present invention, blade is made up of a plurality of cambered surface projection pieces, rigidity and intensity are better, rib has connected whole blade, further improved the structural strength of bottom nozzle, and the runner of single sealing has improved the filtration capacity of bottom nozzle with respect to open runner, reduced the cooling medium pressure drop, the geometric configuration of blade and rib also adopts the form that is conducive to reduce the cooling medium pressure drop, comprehensive above factor, this bottom nozzle all has good performance aspect structural strength, filtration capacity, the cooling medium pressure drop three.

Description of drawings

Fig. 1 is the structural representation of reactor fuel assemblies.

Fig. 2 is the bottom nozzle shaft side figure.

The combination synoptic diagram of Fig. 3 blade and rib assembly.

Fig. 4 is the structural representation of blade.

Fig. 5 is the schematic cross-section of blade.

Fig. 6 is the structural representation of last rib.

Fig. 7 is the end view of last rib.

Fig. 8 is the cut-open view of bottom nozzle.

Fig. 9 is structure and the stressed synoptic diagram of blade.

Figure 10 is blade construction and the stressed synoptic diagram of prior art.

Figure 11 is the schematic cross-section of rib assembly.

Figure 12 is the schematic cross-section of the rib assembly of prior art

Figure 13 is that the position of rib assembly and blade concerns synoptic diagram in the prior art.

Label among the figure is expressed as respectively: 1, reactor fuel assemblies; 2, comprise base; 3, screen work; 4, fuel rod; 5, gauge pipe; 6, guide pipe; 7, bottom nozzle; 8, blade; 9, rib assembly; 91, go up rib; 92, following rib; 10, framework; 11, supporting leg; 12, supporting base; 13, runner; 14, projection piece; 15, groove; 16, straight section; 17, seamlessly transit; 20 draw-in grooves.

Among Fig. 1 ↑ the expression cooling medium flow to direction.Among Fig. 9 and Figure 10 ↓ the expression blade be subjected to force direction.

Embodiment

Embodiment one

Shown in Fig. 1-8.A kind of bottom nozzle with filtration foreign matter function comprises the rib assembly 9 that some axis blade parallel to each other 8 and some axis are parallel to each other, and the axis of the axis of described rib assembly 9 andblade 8 is orthogonal; Rib assembly 9 constitutes being much ofrib 91 and followingrib 92 by two, andlast rib 91 has the draw-in groove 20 corresponding withblade 8 quantity separately with followingrib 92 relative faces; Describedblade 8 comprises theprojection piece 14 of some protrusion direction unanimities, is connected bystraight section 16 between adjacent twoprojection pieces 14, andstraight section 16 upper surfaces and lower surface all havegroove 15, and the protrusion direction of the opening direction of describedgroove 15 andprojection piece 14 is orthogonal;Last rib 91 is positioned atblade 8 tops, groove of the draw-in groove ofrib 91 andblade 8 upper surfaces adopts interlock mode mouth to mouth to be connected together on it, followingrib 92 is positioned atblade 8 belows, and draw-in groove ofrib 92 and the groove ofblade 8 lower surfaces adopt interlock mode mouth to mouth to be connected together under it.

The described end face width of going uprib 91 along the opening direction of draw-in groove 20 ascending arrive again little.

The square section of described projection piece is arc surfaced.Projection piece 14 comprises planar member and is arranged on the projection of planar member one side.The projection ordinary priority is used the projection of sphere shape.

Adopt betweenstraight section 16 and theprojection piece 14 and seamlesslytransit 17 and be connected.

Also compriseframework 10, the two ends of rib assembly and the two ends of blade all are embedded on theframework 10.

Describedframework 10 also is connected with supportingleg 11.

Also comprise supporting base 12, described supporting base 12 is arranged in the framework, and the axis of supporting base 12 is vertical withframework 10 upper surfaces.

Also comprise supporting base 12, described supporting base 12 is arranged on and is embedded between the two adjacent blades between the Huo and adjacent two rib assemblies, and the axis of supporting base 12 is vertical withframework 10 upper surfaces.

Also comprise supporting base 12, described supporting base 12 is embedded on the rib assembly, and the axis of supporting base 12 is vertical withframework 10 upper surfaces.

The position of supporting base 12 arranges, be withgauge pipe 5 and guide pipe as the reference standard, in theory, supporting base is the optional position that can be arranged in the framework.Pay the utmost attention on structural strength and be installed on the rib assembly, therefore require supporting base 12 preferentially to be embedded on the rib assembly.

Reactor fuel assemblies 1 as shown in Figure 1 comprises thelast base 2,screen work 3, thebottom nozzle 7 that from top to bottom arrange successively, and cooling medium is flowed into bybottom nozzle 7 during reactor operation, is flowed out by last base 2.Fuel rod 4,gauge pipe 5,guide pipe 6 all are arranged in thescreen work 3.

Bottom nozzle 7 shown in accompanyingdrawing 2, accompanyingdrawing 3 comprises the assembly that is made ofblade 8 and rib assembly 9, assembly is embedded on theframework 10, supportingleg 11 is used for supporting whole bottom nozzle structure, and supporting base 12 is embedded in the assembly in order to connectgauge pipe 5 andguide pipe.Blade 8 is neat and comparatively intensive being arranged in together with a determining deviation,blade 8 the right and left symmetric offset spread;Last rib 91 and followingrib 92clamp blade 8 from the both direction up and down of blade respectively with uniform spacing, the position of thecorresponding guide pipe 6 of the arrangement position of rib assembly 9, and rib assembly 9 is positioned at the below ofguide pipe 6; Afterblade 8 arranges with rib assembly 9, the hole is cut in position atcorresponding gauge pipe 5 andguide pipe 6, in the hole and installation bearing seat 12, being about to supporting base 12 is embedded in the assembly,blade 8 and rib assembly 9 are embedded in theframework 10,framework 10 is supported by supportingleg 11, andframework 10 can be combination with supportingleg 11, also can itself be exactly one; Above total fully in conjunction with as a whole, is namely becomebottom nozzle 7.

Concrete, shown in accompanying drawing 4-8,blade 8 is made up of 16projection pieces 14, the height of projection ofprojection piece 14 is enough to closed flow 13, connected bystraight section 16 between twoprojection pieces 14,straight section 16 has agroove 15 on both sides up and down and is used for being installed of rib assembly 9, is connected with seamlessly transitting 17 betweenstraight section 16 and theprojection piece 14;Last rib 91 and followingrib 92 each self-contained draw-in groove 20 corresponding withblade 8 quantity, after being installed, the height oflast rib 91 and followingrib 92 is enough to closed flow 13, andlast rib 91 and followingrib 92 all adopt the circular arc smooth transition everywhere.

In the present embodiment, blade is made up of a plurality of cambered surface projection pieces, rigidity and intensity are better, the rib assembly has connected whole blade, further improved the structural strength of bottom nozzle, and the runner of single sealing has improved the filtration capacity of bottom nozzle with respect to open runner, reduced the cooling medium pressure drop, the geometric configuration of blade and last rib also adopts the form that is conducive to reduce the cooling medium pressure drop, comprehensive above factor, this bottom nozzle all has good performance aspect structural strength, filtration capacity, the cooling medium pressure drop three.

The function of the following structure of specific description is: seamlessly transit between the projection piece, be conducive to reduce the cooling medium pressure drop.The geometric configuration oflast rib 91 and followingrib 92 is conducive to reduce the cooling mediumpressure drop.Blade 8 constitutes the runner 13 that seals with rib assembly 9, is conducive to reduce the cooling medium pressure drop and improves filtration capacity.Rib assembly 9 connectsblade 8, is conducive to improve the intensity of structure.

Blade is formed (seeing accompanying drawing 9) by a plurality of cambered surface protrusion unit among the present invention, the cambered surface of blade laterally runs through whole piece blade (seeing accompanying drawing 10) in the background technology, as Fig. 9 and shown in Figure 10, among the figure ↓ presentation graphs in blade be subjected to force direction, under the diagram pressure direction, because being the plane consistent with pressure direction between two cambered surface projections, theblade 8 among the present invention connects, and in thebackground technology blade 22 shown in similar a kind of spring under the pressure direction, therefore when bottom nozzle was stressed,blade 8 of the present invention had rigidity and the intensity than blade the last 22 several times of background technology.In addition, among the present invention,last rib 91 and followingrib 92 up/down perforations, as Figure 11 and shown in Figure 12, bending resistance of rib (cutting) section A 911 areas are 3 times of rib bending resistance (cutting) cross section D191 area of going up rib bending resistance (cutting) the cross section C291 of rib and following rib in the background technology on it, the area of bending resistance (cutting) section A 911 of bending resistance (cutting) the cross section B921 of the followingrib 92 among the present invention and last rib equates, sees accompanyingdrawing 11 and 12.Through calculating, the bending resistant section coefficient (counter-bending ability) of bending resistance (cutting) section A 911 that goes up rib of the present invention and shearing resistance section factor (anti-shear ability) be respectively in the background technology on 1.2 times and 3 times of rib bending resistance (cutting) cross section C291 of rib.Therefore, the mechanical property of comprehensive blade and rib, under same overall dimensions, mechanical property of the present invention will be better than background technology more than 20%, and based on this, the present invention will have the surplus on enough mechanical propertys to adjust the size and shape of blade and rib, increase circulation area, increase foreign matter by difficulty, realize bottom nozzle well balanced on performance aspect structural strength, cooling medium pressure drop, the filtration capacity three.

Shown in Figure 13, in background technology, adoptblade 22 as shown in figure 10, the cambered surface of thisblade 22 laterally runs through the whole piece blade.Adopt two cross sectional shapes to be circular cylinder then, the two ends up and down ofblade 22 are lived in compacting respectively.Therefore its poor stability of this method and structure than the present invention, can obviously determine the present invention and have obvious improvement and outstanding difference technical characterictic.

Embodiment 2

The difference of present embodiment andembodiment 1 is:projection piece 14 comprises planar member and is arranged on the projection of planar member one side.It is fairshaped projection that the projection ordinary priority is used crowning.

Embodiment 3

The difference of present embodiment andembodiment 1 is:projection piece 14 comprises planar member and is arranged on the projection of planar member one side.The projection ordinary priority uses crowning to be the projection of m shape.

Embodiment 4

The difference of present embodiment andembodiment 1 is:projection piece 14 comprises planar member and is arranged on the projection of planar member one side.The projection ordinary priority uses crowning to be the projection of C shape.

As mentioned above, then can well realize the present invention.

Claims (10)

1. one kind has the bottom nozzle that filters the foreign matter function, and it is characterized in that: comprise some blades (8), described blade (8) comprises the projection piece (14) of some protrusion direction unanimities, is connected by straight section (16) between adjacent two projection pieces (14).

2. a kind of bottom nozzle that filters the foreign matter function that has according to claim 1 is characterized in that: also comprise some and rib assembly (9) blade (8) clamping, described rib assembly (9) and the crisscross formation network that arranges of blade (8).

3. a kind of bottom nozzle that filters the foreign matter function that has according to claim 2, it is characterized in that: rib assembly (9) constitutes being much of rib (91) and following rib (92) by two, and the face that last rib (91) is relative with following rib (92) has the draw-in groove (20) corresponding with blade (8) quantity separately; Straight section (16) upper surface and lower surface all have groove (15), and the protrusion direction of the opening direction of described groove (15) and projection piece (14) is orthogonal; Last rib (91) is positioned at blade (8) top, the groove of the draw-in groove of rib on it (91) and straight section (16) upper surface is connected together, following rib (92) is positioned at blade (8) below, and draw-in groove of rib (92) and the groove of straight section (16) lower surface are connected together under it.

4. a kind of bottom nozzle that filters the foreign matter function that has according to claim 3 is characterized in that: the described end face width of going up rib (91) along the opening direction of draw-in groove (20) ascending arrive again little.

5. a kind of bottom nozzle that filters the foreign matter function that has according to claim 3, it is characterized in that: the square section of described projection piece (14) is arc surfaced.

6. a kind of bottom nozzle that filters the foreign matter function that has according to claim 3 is characterized in that: adopt between straight section (16) and the projection piece (14) to seamlessly transit (17) and be connected.

7. a kind of bottom nozzle that filters the foreign matter function that has according to claim 3, it is characterized in that: also comprise framework (10), the two ends of rib assembly (9) and the two ends of blade all are embedded on the framework (10); Described framework (10) also is connected with supporting leg (11).

8. a kind of bottom nozzle that filters the foreign matter function that has according to claim 7, it is characterized in that: also comprise supporting base (12), described supporting base (12) is arranged in the framework (10), and the axis of supporting base (12) is vertical with framework (10) upper surface.

9. a kind of bottom nozzle that filters the foreign matter function that has according to claim 7, it is characterized in that: also comprise supporting base (12), described supporting base (12) is embedded between the two adjacent blades between the Huo and adjacent two rib assemblies, and the axis of supporting base (12) is vertical with framework (10) upper surface.

10. a kind of bottom nozzle that filters the foreign matter function that has according to claim 7, it is characterized in that: also comprise supporting base (12), described supporting base (12) is embedded on the rib assembly (9), and the axis of supporting base (12) is vertical with framework (10) upper surface.

Images