GB2524455A

GB2524455A - Lower tube socket with foreign matter filtering function

Info

Publication number: GB2524455A
Application number: GB1513650.0A
Authority: GB
Inventors: Min Su; Linna Feng; Jie Chen; Jun Ru; Tao Lei; Tao Qing; Jing Yong; Zhong Xiao
Original assignee: Nuclear Power Institute of China
Current assignee: Nuclear Power Institute of China
Priority date: 2013-06-18
Filing date: 2013-12-12
Publication date: 2015-09-23
Anticipated expiration: 2033-12-12
Also published as: CN103337262B; GB2524455B; AR095872A1; CN103337262A; GB201513650D0; WO2014201818A1

Abstract

A lower tube socket with a foreign matter filtering function, comprising a plurality of blades (8) the axes of which are in parallel with each other, and a plurality of rib assemblies (9) the axes of which are in parallel with each other, wherein the axes of the rib assemblies and the axes of the blades are mutually perpendicular; each rib assembly is composed of two symmetrical ribs, clamping grooves, the number of which corresponds to that of the blades, are arranged on the opposite surface of the two ribs respectively, and the blades are clamped in the clamping grooves; and each blade comprises several convex pieces, the convex directions of which are consistent, every two adjacent convex pieces are connected via a straight section, grooves are arranged on an upper end surface and a lower end surface of the straight section respectively, the opening direction of the grooves and the convex direction of each convex piece are mutually perpendicular, and the rib assemblies are clamped in the grooves. The lower tube socket has an excellent performance in the three respects, i.e. structural strength, filtering capability and pressure drop of coolant, respectively.

Description

Specification

Lower Tube Socket With Foreign Matter Filtering Function

Technical Field

The present invention relates to a lower tube socket of the reactor liiel component, specifically to a lower tube socket with a foreign matter filtering function.

Background Art

The lower tube socket is the lower component of the reactor fuel component and functions in supporting, positioning and distributing the flow of the coolant In addition, under the operation of the reactor, the coolant flows through the fuel component at a fast rate. The possible foreign matters in the coolant may cause damage to the fuel rods, resulting in the risk of breakage of the the! rods. In order to limit such risk, the lower tube socket needs to have a foreign matter filtering function so as to prevent foreign matters from flowing into the fuel component.

The rigidity and strength of the filtering portion of the existing lower tube socket is limited, with negative impact on the structural strength and stiffliess of the lower tube socket Under stringent load conditions, the lower tube socket is easy to suffer excessive deformation and even collapse.

Summary of the Invention

The present invention aims to provide a lower tube socket applicable to reactor fuel component, which can balance the structural strength and filtering capacity of the lower tube socket and pressure drop of the coolant and further improve structural strength and pressure drop of the coolant, thereby improving the overall performance of the fuel component, i.e. to provide a lower tube socket with a foreign matter filtering function.

The present invention is achieved by the following solution: a lower tube socket with a foreign matter filtering function, comprising multiple blades, wherein the blade includes multiple convex pieces projecting in the same direction; and two adjacent convex pieces are connected by a straight section. The convex piece comprises a plane piece and a bulge on one surface of the plane piece. The bulge is generally preferred to use streamlined bulge, such as spherical-shaped bulge. The straight section between the convex pieces can guarantee that the force passes the straight section in parallel reduce the force on the blade In the filtering structure. Meanwhil; the streamlined bulge can further is disperse the force in the vertical direction from above or downward.

It thither comprises multiple rib assemblies clamped with the blades, wherein the rib assemblies and blades are arranged in crisscross manner to constitute a grid structure. The rib assemblies are used for fixing the blades, and the clamping manner can support and fix the blades so as not to suffer deformation or offset.

The rib assembly consists of an upper rib and a lower rib arranged symmetrically, wherein the opposite surfaces of the upper rib and the lower rib are respectively provided with the same number of slots as the blades; the upper end surface and lower end surface of the straight section are provided with a groove; the opening direction of the groove is vertical to the projecting direction of the convex piece; the upper rib is located above the blade, with the slot of the upper rib clamped with the groove of the upper end surface of the straight section; and the lower rib is located below the blade, with the slot of the lower rib clamped with the groove of the lower end surface of the straight section. In the present invention, the upper rib and the lower rib are extended to the area between the blades to form a passage for further ensuring its strength and form a flow passage to together with the blade for filtering foreign matters.

The upper end surface of the upper rib becomes gradually wider and then narrower along the opening direction of the slot.

The cross-section of the convex piece is arc-shaped.

The straight section and the convex piece are connected by a smooth transitional section.

It further comprises a framing body, wherein both ends of the rib assembly and both ends of the blade are arranged in the framing body.

The framing body is further connected with a leg.

It further comprises a supporting base, wherein the supporting base is arranged in the framing body; and the axes of the supporting base is vertical to the upper surface of the framing body.

It further comprises a supporting base, wherein the supporting base is arranged between two adjacent blades or/and two adjacent rib assemblies; and the axes of the supporting base is vertical to the upper surface of the framing body.

It fbrther comprises a supporting base, wherein the supporting base is arranged in the rib assembly; and the axes of the supporting base is vertical to the s upper surface of the framing body.

The location of the support base is arranged with reference to the meter tube and the guide tube. Theoretically, the supporting base can be arranged at any position of the framing body. From the structural strength, it is a priority to mounting on the rib assembly, thus requiring the supporting base to be preferably mounted on the rib assembly.

The axes of the rib assembly is vertical to that of the blade to constitute a grid. The upper rib and the lower rib hold the blade respectively from above and below. In order to save space, the upper end surface and lower end surface of the straight section are provided with a groove respectively so that the slot of the upper rib and the slot of the lower rib can snap the groove respectively from two directions to ensure that the upper rib and lower rib are embedded in the blade, thereby saving space. Meanwhile, the above-described manner can ensure that the blade will not move in the longitudinal and transverse direction relative to the upper rib and the lower rib to form a cross-shaped fastener, thereby enhancing the fixing function.

Based on the above configuration, in light of the problems of the prior art in structural strength, filtering ability and pressure drop of the coolant, the present invention claims a lower tube socket with better performance, which adopts multiple blades composed of multiple arcshaped convex pieces to arrange the blades neatly and symmetrically at a certain space so that a passage for filtering foreign matters is formed between two parallel convex pieces on two adjacent s blades. Two upper and lower ribs of the same structure arranged symmetrically are used to clamp the blade from above and below as well as the gap between the two adjacent convex pieces to further divide th.e how passage between two adjacent blades into a single fullyc1osed flow passage, thereby enhancing the filtering function and reducing the pressure drop of the coolant in order to o increase the structural strength, the supporting base is embedded in.. the combination composed of the blade and the rib to provide installation structure for the meter tube and guide tube of the fuel component. The combination is fixed by the framing body, and namely that the two ends of the rib and the two ends of the blade are mounted on the framing body. The whole structure is supped by a legS The entire structure of the above is combined as a whole to constitute the lower tube socket.

In the present invention, the blade is composed of a plurality of arcshaped convex pieces, with good stiffness and strength. The ribs pass through the entire blade, further increasing the structural strength of the lower tube socket.

Compared with the open flow passage, the individual closed flow passage improves filtering capability of the lower tube soclcet and reduces pressure drop of the coolant. The geometry of the blade and rib can also help reduce the pressure drop of the coolant, in light of the above factors, the lower tube socket is advanced in structural strength, filtering capability and pressure drop of coolant.

Brief Description of Drawings

Fig. 1 is the structural diagram of a reactor fuel component.

Fig. 2 is the isometric view of the lower tube socket.

Fig. 3 is combination view of blade and rib assembly Fig. 4 is the schematic structural view of the blade.

Fig. 5 is the schematic section view of the blade.

Fig. 6 is the schematic structural view of the upper rib.

to Fig. 7 is the end surface view of the upper rib, Fig. S is the sectional view of the lower lube socket.

Fig. 9 is the schematic view of the structure and force of the blade.

Fig. 10 is the schematic view of the structure and force of the blade of prior aft Fig. ills the schematic sectional view of the rib assembly.

Fig. 12 is the schematic sectional view of the rib assembly of prior art.

Fig. 13 is the schematic view of the location relationship between tfie rib

assembly and the blade of the prior art,

The numbers in the figures respectively represent the contents as follows: 1-reactor fuel component; 2-including top nozzle; 3-grid; 4-fuel rod; 5-meter tube; 6-guide tube; flower tube socket; 8-blade; 9-rib assembly; 91-upper rib; 92-lower rib; 10-framing body; Il-leg 12-supporting base; l3JIow passage; l4convex piece; l5groove; i& straight section; I7smooth transitional section; and 20sl.ot, In Fig. 1, indicates the flow direction of the coolant. In Fig. 9 and Fig. 10, represents the force direction of the blade.

s Enhodirnents Embodiment I As shown in Fig. 14, the lower tube socket with a foreign matter filtering ftnction comprises multiple blades 8 with the axes parallel with each other and multipl.e rib assemblies 9 with. the axes parallel with each other, wherein the axes to of the rib assembly is vertical to that of the bladeS; the rib assembly 9 conskts of an upper rib 91. and a lower rib 92 arranged symmetrically; the opposite surfaces of the upper rib 91 and the lower rib 92 are respectively provided with the same number of slots 20 as the blades 8; the blade 8 includes multiple convex pieces 14 projecting in the same direction; two adjacent convex pieces 14 are connected by a straight section 16; the up*per end surface and lower end surface of the straight section 16 are provided with a groove 1 5; the opening direction o:i 1:he groove 15 is vertical to the projecting direction of the convex piece 14; the upper rib 91 is located above the blade 8, wth the slot of the upper rib 91 clamped with the groove of the upper end sur:face of the blade 8; and the lower rib 92 is located below the blade 8, with the slot of the lower rib 92 clamped with the groove of the lower end surface of the blade 8.

The upper end surface of the upper rib 91 becomes gradually wider and then narrower along the opening direction of the slot 20.

The cross-section of the convex piece is arc-shaped. The convex piece 14 comprises a plane piece and a bulge on one surface of the plane piece. The bulge is generally preferred to be spherical-shaped.

s The straight section 16 and the convex piece 14 are connected by a smooth transitional section 17.

It further comprises a framing body 10, wherein both ends of the rib assembly and both ends of the blade are arranged in the framing body 10.

The framing body 10 is further connected with aleg 11.

It further comprises a supporting base 12, wherein the supporting base 12 is arranged in the framing body; and the axes of the supporting base 12 is vertical to the upper surface of the framing body 10.

It further comprises a supporting base 12, wherein the supporting base 12 is arranged between two adjacent blades or/and two adjacent rib assemblies; and the is axes of the supporting base 12 is vertical to the upper suite of the framing body It fEather comprises a supporting base 12, wherein the supporting base 12 is arranged in the rib assembly; and the axes of the supporting base 12 is vertical to the upper surface of the framing body 10.

The location of the support base 12 is arranged with reference to the meter tube S and the guide tube. Theoretically, the supporting base can be arranged at any position of the framing body. From the structural strength, it is a priority to mounting on the rib assembly, thus requiring the supporting base 12 to be preferably mounted on the rib assembly.

As shown in Fig. 1, the reactor the! component comprises a top nozzle 2, a grid 3 and a lower tube socket 7 sequentially disposed from top to bottom, wherein in case of operation of the reactor, the coolant flows in from the lower tube socket 7 and flows out of the top nozzle 2. The thel rod 4, the meter tube 5 and the guide tube 6 are arranged in the grid 3.

As shown in Fig. 2 and Fig. 3, the lower tube socket 7 comprises a combination composed of the blade 8 and the rib assembly 9, wherein the rib c assembly is mounted on the framing body 10, the leg Ii is used for supporting the whole lower tube socket, and the supporting base 12 is embedded in combination for connecting the meter tube S and the guide tube. The blades 8 are under dense arrangement neatly and symmetrically on both sides. The upper rib 91 arid the lower rib 92 hold the blade 8 respectively from above and below. The Is arrangement location of: rib assemblies 9 corresponds to the location of the guide tube 6. The rib assembly 9 is located below the guide tube 6. After the blade 8 and the rib assembly 9 are arranged well, holes are cut at the location corresponding to the meter tube 5 and the guide tube 6. The supporting base 12 is installed in the hole, namely that the supporting base 12 is embedded into the combination and the blade 8 and the rib assembly 9 are embedded in the framing body 10. The framing body 10 is supported by the leg 11, The framing body 10 and the leg 11 may be combined or he respectively an integral. The entire structures above are integrated into a whole to form the lower tube socket 7.

Specifically, as shown in Fig, 4 -8, the blade 8 is composed of 16 convex pieces 14, wherein the convex piece 14 is high enough to close the flow passage 13; two convex pieces 14 are connected by a straight section 16; in the upper side and the lower side of the straight section 16 are respectively opened with a groove for clamping the rib assemblies 9; the straight section 16 and the project member 14 are connected by a smooth transitional section 17; the upper rib 91 and the lower rib 92 respectively contain as many slots 20 as the blades 8; after clamping, the upper rib 91 and the lower rib 92 are high enough to close the flow to passage 13; and the upper rib 91 and the lower rib 92 are of arc smooth transition.

In the embodiment, the blade is composed of a plurality of arcshaped convex pieces, with good stifthess and strength. The rib assemblies pass through the entire blade, further increasing the structural strength of the lower tube socket Compared with the open flow passage, the individual closed flow passage is improves filtering capability of the lower tube socket and reduces pressure drop of the coolant. The geometry of the blade and the upper rib can also help reduce the pressure drop of the coolant. In light of the above factors, the lower tube socket is advanced in structural strength, filtering capability and pressure drop of coolant.

The function of the following structures is described in details as follows: the smooth transition between the convex pieces helps to reduce the pressure drop of the coolant. The geometry of the upper rib 91 and the lower rib 92 helps to reduce pressure drop of the coolant. The closed flow passage 13 composed of the blade 8 and the rib assembly 9 helps to reduce pressure drop of the coolant and improve filtering capability. The rib assembly 9 passes through the blades, which helps to improve the strength of the structure.

The present invention consists of multiple arc-shaped projection cells (see Fig. 9). In the background art, sur&ce of the blade transversely passes through the entire blade (see Fig. 10), As shown in Fig. 9 and Fig. 10, j shows the direction of the force applied on the blade. In the force direction, in the present invention, the blade 8 between two arc bulges is connected with the plane which is in consistent direction with the pressure. However, in the pressure direction, the blade 22 of the to background art is more like a spring so that in case that force is applied on the lower nozzle, the bladeS of the present invention is multiple times better than the blade 22 of the background art in terms of stiffliess and strength. Further, in the present invention, the upper rib 91 and the lower rib 92 are through. As shown in Fig. 11 and Fig. 12, the area of bending (shearing) section A91 1 of the upper rib is is three times that of the bending (shearing) section C291 and the area of the bending (shearing) section D191 of the lower rib of the background art. The area of the bending (shearing) section B92l of the lower rib 92 is equal to that of the bending (shearing) section A91 1 of the upper rib in the present invention. See Fig. 11 and Fig. 12. After calculation, the bending section factor (bending resistance) and shearing section factor (shearing resistance) of the bending (shearing) section A91l of the upper rib of the present invention are respectively 1.2 and 3 times that of the bending (shearing) section C29l of the upper rib of the background art.

Therefore, in terms of the mechanical properties of the blades and ribs, in case of the same overall size, the mechanical properties of the present invention is higher than that of the background art by over 20%. On this basis, the present invention has sufficient mechanical property margin to adjust the size and shape of the s blades and ribs to increase the flow area and difficulty for foreign matters to pass, thereby well balancing the structural strength of the lower tube socket, pressure drop of the coolant and the filtering capacity.

As shown in Fig. 13, in the background art, the blade 22 as shown in Fig. 10 is adopted, wherein the arc surthce of the blade 22 passes laterally through the entire blade. Then, two cylinders with circular cross section are adopted to respectively suppress the upper end and the lower end of the blade 22. Therefore, this method and structure result in poor stability. Compared with it, the present invention has clearly significant progress and prominent distinguishing features.

Embodiment 2 is The difference between this embodiment and the embodiment 1 lies in that: the convex piece 14 comprises a plane piece and a bulge on one surface of the plane piece; and the bulge is generally preferred to be streamlined bulge.

Embodiment 3 The difference between this embodiment and the embodiment 1 lies in that: the convex piece 14 comprises a plane piece and a bulge on one suthce of the plane piece; and the bulge is generally preferred to be rn-shaped.

Embodiment 4 The difference between this embodiment and the embodiment 1. lies in that: the convex piece 14 comprises a plane piece and a bulge on one surface of the plane i ieee; and the bulge k generally preferred to be Cshaped.

As described above, the present invention can be achieved vefl. Ckkns