Sodium-cooled fast reactor large-diameter thin-walled low thermal expansion tube structure
By incorporating axial and circumferential reinforcing ribs and plates into the large-diameter, thin-walled, low-thermal-expansion tubes of sodium-cooled fast reactors, combined with corrugated sections and corrosion-resistant layers, the problem of poor compressive strength of the tubes was solved, structural strength and service life were improved, and deformation and leakage were reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI XINFENG TUBE IND
- Filing Date
- 2025-07-17
- Publication Date
- 2026-05-26
Smart Images
Figure CN224283983U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe fittings technology, and in particular to a large-diameter, thin-walled, low-thermal-expansion pipe fitting structure for sodium-cooled fast reactors. Background Technology
[0002] Sodium-cooled fast reactors (SLFRs), as one of the key reactor types in fourth-generation nuclear energy systems, offer advantages such as efficient utilization of nuclear fuel and transmutation of long-lived radioactive waste. Their internal components must operate stably for extended periods under extreme conditions including high temperatures, strong neutron radiation, and liquid sodium corrosion, thus placing stringent requirements on key tubing materials. Large-diameter, thin-walled, low-thermal-expansion tubing is a core component of SLFRs, hence the urgent need for a suitable structure for it. However, due to their large diameter and thin walls, these tubing components exhibit poor compressive strength and are easily deformed by bending under stress. Utility Model Content
[0003] In response to the shortcomings of the existing production technology, the applicant provides a large-diameter, thin-walled, low-thermal-expansion tube structure for sodium-cooled fast reactors. By improving the large-diameter, thin-walled, low-thermal-expansion tube structure, its structural strength is enhanced and its compressive strength is improved to avoid bending deformation.
[0004] The technical solution adopted in this utility model is as follows:
[0005] A large-diameter, thin-walled, low-thermal-expansion tube structure for a sodium-cooled fast reactor includes: a tube body, multiple first reinforcing ribs, multiple second reinforcing ribs, and multiple reinforcing plates. The first reinforcing ribs are embedded in the tube body and are evenly distributed along the axial direction of the tube body. The second reinforcing ribs are embedded in the tube body and connected to the first reinforcing ribs. An accommodating space is formed between two adjacent first reinforcing ribs and two adjacent second reinforcing ribs. The multiple second reinforcing ribs are evenly distributed along the circumferential direction of the tube body. The reinforcing plates are embedded in the tube body, and each reinforcing plate fills the accommodating space formed between two adjacent first reinforcing ribs and two adjacent second reinforcing ribs.
[0006] Therefore, by setting first and second reinforcing ribs in the axial and circumferential directions of the tube body respectively, the structural strength of the entire sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure is improved. Compared with the existing tube structure, this tube structure strengthens the structural strength from two directions through first and second reinforcing ribs in two different directions, thereby improving the compressive strength of the tube and preventing the tube from bending and deforming under pressure, thus increasing the service life of the sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure. In addition, the reinforcing plate can strengthen the structural strength of other areas of the tube to prevent bending and deformation under pressure such as trampling, thereby further improving the service life of the sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure.
[0007] As a further improvement to the above technical solution: the second reinforcing rib penetrates through the first reinforcing rib and is connected to the first reinforcing rib. Thus, the design of the second reinforcing rib penetrating the first reinforcing rib allows the first and second reinforcing ribs to mutually constrain each other, thereby further improving the structural strength of the large-diameter, thin-walled, low-thermal-expansion tube structure of the sodium-cooled fast reactor.
[0008] As a further improvement to the above technical solution: the first reinforcing rib has an annular cross-sectional shape along the radial direction of the pipe body, and the diameter of the first reinforcing rib is d1; the second reinforcing rib has a circular cross-sectional shape along the radial direction of the pipe body, and the diameter of the second reinforcing rib is d2; d1 > d2. Thus, by using the design method of d1 > d2, the second reinforcing rib can be inserted into the first reinforcing rib.
[0009] As a further improvement to the above technical solution: the pipe body includes: an intermediate section, two corrugated sections, a first connecting section, and a second connecting section. The two corrugated sections are located at both ends of the intermediate section and are respectively installed on the two end faces of the intermediate section. The first connecting section and the second connecting section are respectively installed on the end faces of the two corrugated sections away from the intermediate section. Adjacent pipe body sections are connected by the first connecting section and the second connecting section. Therefore, because the corrugated sections have a certain degree of expansion and contraction, the overall size of the sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion pipe structure remains relatively small despite temperature changes, thereby reducing stress deformation caused by thermal expansion and contraction, and even leakage due to damage.
[0010] As a further improvement to the above technical solution: the first reinforcing rib, the second reinforcing rib, and the reinforcing plate are all embedded in the middle section.
[0011] As a further improvement to the above technical solution: the length of the intermediate section is L1, the length of the corrugated section is L2, the length of the first connecting section is L3, and the length of the second connecting section is L4; L1 > L2 > L3 > L4. Thus, by limiting the dimensions of each part of the pipe body, it is ensured that when the second connecting section is inserted into the first connecting section, the first connecting section will not cover the corrugated section and will not affect the expansion and contraction of the corrugated section.
[0012] As a further improvement to the above technical solution: the first connecting section has a first mounting groove, and a sealing gasket is embedded in the first mounting groove; the second connecting section of the preceding pipe body is inserted into the first mounting groove of the following pipe body, so that the two adjacent pipe body sections are connected. Thus, the first mounting groove facilitates the insertion of the second connecting section into the first connecting section; the sealing gasket ensures the sealing effect after the connection of two adjacent sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion pipe structures.
[0013] As a further improvement to the above technical solution: the end face of the first connecting section near the axis of the intermediate section is a slope, and the slope is inclined towards the side near the axis of the intermediate section. Therefore, this slope ensures that the fluid in the pipe flows without loss in the transition area between two adjacent pipes, thus achieving lossless fluid transport.
[0014] As a further improvement to the above technical solution: a second mounting groove is provided on the end face of the first connecting segment away from the axis of the intermediate segment, and a locking member is threadedly connected to the first connecting segment relative to the position of the second mounting groove. A mounting block is provided on the outer wall of the second connecting segment. Multiple second mounting grooves are provided, and these grooves are distributed in a ring with equal spacing. The locking member and the mounting block correspond one-to-one with each second mounting groove. The second connecting segment of the preceding pipe body is inserted into the first mounting groove of the following pipe body, and the mounting block of the preceding pipe body is inserted into the second mounting groove of the following pipe body. The locking member of the preceding pipe body is inserted into the second connecting segment of the following pipe body, thereby connecting the adjacent pipe body segments. Thus, through the cooperation of the mounting block and the second mounting groove, the connected two segments of the sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion pipe structure are limited, restricting the relative rotation of the two segments. This improves the connection effect between the two segments.
[0015] As a further improvement to the above technical solution: the inner walls of the intermediate section, the corrugated section, the first connecting section, and the second connecting section are all provided with a corrosion-resistant layer. Therefore, the corrosion-resistant layer improves the corrosion resistance of the large-diameter thin-walled low-thermal-expansion tube structure of the sodium-cooled fast reactor, thereby increasing the service life of the large-diameter thin-walled low-thermal-expansion tube structure of the sodium-cooled fast reactor.
[0016] The beneficial effects of this utility model are as follows:
[0017] By providing first and second reinforcing ribs in the axial and circumferential directions of the tube body, the structural strength of the entire sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure is improved. Compared with existing tube structures, this tube structure strengthens the structural strength from two directions through first and second reinforcing ribs in two different directions, thereby improving the compressive strength of the tube and preventing bending deformation due to pressure, thus extending the service life of the sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure. In addition, the reinforcing plates can strengthen the structural strength of other areas of the tube to prevent bending deformation due to pressure such as trampling, thereby further improving the service life of the sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure.
[0018] This utility model also has the following advantages:
[0019] 1. The design of the second reinforcing rib penetrating the first reinforcing rib of this utility model enables the first and second reinforcing ribs to restrain each other, thereby further improving the structural strength of the large-diameter thin-walled low thermal expansion tube structure of the sodium-cooled fast reactor; the design of d1>d2 enables the second reinforcing rib to be inserted into the first reinforcing rib.
[0020] 2. Because the corrugated section of this utility model has a certain degree of expansion and contraction, the overall size of the large-diameter thin-walled low-thermal-expansion tube structure of the sodium-cooled fast reactor can always maintain a small dimensional change when the temperature of the entire structure changes. This reduces stress deformation caused by thermal expansion and contraction, and even leakage caused by damage.
[0021] 3. This utility model can improve the corrosion resistance of the large-diameter thin-walled low-thermal-expansion tube structure of sodium-cooled fast reactor through the corrosion-resistant layer, thereby increasing the service life of the large-diameter thin-walled low-thermal-expansion tube structure of sodium-cooled fast reactor. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of the large-diameter thin-walled low thermal expansion tube of the sodium-cooled fast reactor of this utility model;
[0023] Figure 2 This is a cross-sectional view of the large-diameter, thin-walled, low-thermal-expansion tube structure of the sodium-cooled fast reactor of this utility model.
[0024] Figure 3For the present utility model Figure 2 Enlarged schematic diagram of a local structure at point A;
[0025] Figure 4 This is a schematic diagram of the installation of the first reinforcing rib, the second reinforcing rib, and the reinforcing plate of this utility model.
[0026] Figure 5 A cross-sectional view showing the installation of the first and second reinforcing ribs of this utility model;
[0027] Figure 6 This is a schematic diagram illustrating the connection of two large-diameter, thin-walled, low-thermal-expansion tube structures for sodium-cooled fast reactors according to this invention.
[0028] Figure 7 This is a first-view structural schematic diagram of the connection between two large-diameter, thin-walled, low-thermal-expansion tube structures of the present invention for sodium-cooled fast reactors.
[0029] Figure 8 For the present utility model Figure 7 Enlarged schematic diagram of the local structure at point B;
[0030] Figure 9 This is a second-view structural schematic diagram of the connection between two large-diameter, thin-walled, low-thermal-expansion tube structures of the present invention.
[0031] Among them: 1. Pipe fitting body;
[0032] 101. Intermediate section; 102. Corrugated section; 103. First connecting section; 104. Second connecting section; 105. First mounting groove; 106. Sealing gasket; 107. Second mounting groove; 108. Locking element; 109. Mounting block;
[0033] 2. First reinforcing rib;
[0034] 3. Second reinforcing rib;
[0035] 4. Reinforcing plate;
[0036] 5. Corrosion-resistant layer. Detailed Implementation
[0037] The specific embodiments of this utility model are described below with reference to the accompanying drawings.
[0038] like Figures 1 to 9The diagram shows the preferred embodiment of this utility model. The sodium-cooled fast reactor large-diameter thin-walled low thermal expansion tube structure of this embodiment includes: a tube body 1, a plurality of first reinforcing ribs 2, a plurality of second reinforcing ribs 3, and a plurality of reinforcing plates 4. The first reinforcing ribs 2 are embedded in the tube body 1, and the plurality of first reinforcing ribs 2 are evenly distributed along the axial direction of the tube body 1. The second reinforcing ribs 3 are embedded in the tube body 1 and are connected to the first reinforcing ribs 2. An accommodating space is formed between two adjacent first reinforcing ribs 2 and two adjacent second reinforcing ribs 3. The plurality of second reinforcing ribs 3 are evenly distributed along the circumferential direction of the tube body 1. The reinforcing plates 4 are embedded in the tube body 1, and each reinforcing plate 4 fills the accommodating space formed between two adjacent first reinforcing ribs 2 and two adjacent second reinforcing ribs 3. Therefore, by setting the first reinforcing rib 2 and the second reinforcing rib 3 in the axial and circumferential directions of the tube body 1 respectively, the structural strength of the entire sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure is improved. Compared with the existing tube structure, this tube structure strengthens the structural strength from two directions through the first reinforcing rib 2 and the second reinforcing rib 3 in two different directions, thereby improving the compressive strength of the tube and preventing the tube from bending and deforming due to pressure, thus improving the service life of the sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure. In addition, the reinforcing plate 4 can strengthen the structural strength of other areas of the tube to prevent bending and deformation due to pressure such as trampling, thereby further improving the service life of the sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure.
[0039] In this embodiment, the second reinforcing rib 3 penetrates the first reinforcing rib 2 and is connected to it. The first reinforcing rib 2 has a circular cross-sectional shape along the radial direction of the tube body 1, and its diameter is d1. The second reinforcing rib 3 has a circular cross-sectional shape along the radial direction of the tube body 1, and its diameter is d2; d1 > d2. Therefore, the design of the second reinforcing rib 3 penetrating the first reinforcing rib 2 allows the first reinforcing rib 2 and the second reinforcing rib 3 to mutually constrain each other, thereby further improving the structural strength of the large-diameter thin-walled low-thermal-expansion tube structure of the sodium-cooled fast reactor. The design of d1 > d2 allows the second reinforcing rib 3 to be inserted into the first reinforcing rib 2.
[0040] In this embodiment, the pipe body 1 includes: a middle section 101, two corrugated sections 102, a first connecting section 103, and a second connecting section 104. The two corrugated sections 102 are located at both ends of the middle section 101 and are respectively installed on the two end faces of the middle section 101. The first connecting section 103 and the second connecting section 104 are respectively installed on the end faces of the two corrugated sections 102 away from the middle section 101. Adjacent pipe body sections 1 are connected by the first connecting section 103 and the second connecting section 104. The length of the intermediate section 101 is L1, the length of the corrugated section 102 is L2, the length of the first connecting section 103 is L3, and the length of the second connecting section 104 is L4; L1 > L2 > L3 > L4; the first connecting section 103 has a first mounting groove 105, and a sealing gasket 106 is embedded in the first mounting groove 105; the second connecting section 104 of the preceding pipe body 1 is inserted into the first mounting groove 105 of the following pipe body 1, so that the two adjacent pipe body sections 1 are connected; the first connecting section 104 104 104 105 103 104 104 104 105 ...5 104 105 104 105 104 105 104 105 104 105 104 105 104 105 104 105 104 105 105 104 105 105 104 105 105 104 105 105 105 106 105 106 106 106 106 106 107 108 106 106 107 108 106 106 107 10 The end face of the connecting segment 103 near the axis of the intermediate segment 101 is beveled, and the bevel is inclined towards the side near the axis of the intermediate segment 101; a second mounting groove 107 is provided on the end face of the first connecting segment 103 away from the axis of the intermediate segment 101, and a locking member 108 is threadedly connected to the first connecting segment 103 relative to the position of the second mounting groove 107; a mounting block 109 is provided on the outer wall of the second connecting segment 104; multiple second mounting grooves 107 are provided, and the multiple second mounting grooves 107 are evenly spaced. The locking element 108 and the mounting block 109 are arranged in a ring shape, and each of them corresponds to the second mounting groove 107. The second connecting section 104 of the previous pipe body 1 is inserted into the first mounting groove 105 of the next pipe body 1, and the mounting block 109 of the previous pipe body 1 is inserted into the second mounting groove 107 of the next pipe body 1. The locking element 108 of the previous pipe body 1 is inserted into the second connecting section 104 of the next pipe body 1, so that the two adjacent pipe body sections 1 are connected.Therefore, because the corrugated section 102 has a certain degree of expansion and contraction, the overall size of the large-diameter thin-walled low-thermal-expansion tube structure of the sodium-cooled fast reactor remains relatively small during temperature changes, thereby reducing stress deformation caused by thermal expansion and contraction, and even leakage caused by damage. By limiting the dimensions of each part of the tube body 1, it is ensured that the second connecting section 104 is inserted into the first connecting section 103 without the first connecting section 103 covering the corrugated section 102, thus not affecting the expansion and contraction of the corrugated section 102. The first mounting groove 105 facilitates... The second connecting section 104 is inserted into the first connecting section 103; the sealing gasket 106 can ensure the sealing effect after the connection of two adjacent sodium-cooled fast reactor large-diameter thin-walled low thermal expansion tube structures; the inclined surface can ensure that the fluid in the tube does not lose fluid when flowing in the transition area between two adjacent tubes, so as to achieve lossless fluid transport; the mutual cooperation between the mounting block 109 and the second mounting groove 107 is used to limit the connection of the two sodium-cooled fast reactor large-diameter thin-walled low thermal expansion tube structures, so as to restrict the relative rotation of the two tubes, thereby improving the connection effect between the two tubes.
[0041] Specifically, the length L1 of the intermediate section 101 is much greater than the length L2 of the corrugated section 102, the length L3 of the first connecting section 103, and the length L4 of the second connecting section 104. This ensures that most of the large-diameter thin-walled low thermal expansion tube structure of the sodium-cooled fast reactor is in the structurally reinforced area, with only the shorter corrugated section 102 reserved for thermal expansion and contraction, and the shorter first connecting section 103 and second connecting section 104 used for installation connections between adjacent tube sections.
[0042] In this embodiment, the first reinforcing rib 2, the second reinforcing rib 3, and the reinforcing plate 4 are all embedded in the middle section 101.
[0043] In this embodiment, the inner walls of the intermediate section 101, the corrugated section 102, the first connecting section 103, and the second connecting section 104 are all provided with a corrosion-resistant layer 5. Therefore, the corrosion-resistant layer 5 improves the corrosion resistance of the large-diameter thin-walled low-thermal-expansion tube structure of the sodium-cooled fast reactor, thereby increasing the service life of the large-diameter thin-walled low-thermal-expansion tube structure of the sodium-cooled fast reactor.
[0044] The connection process of the adjacent two sections of sodium-cooled fast reactor large-diameter thin-walled low thermal expansion tube structure of this utility model is as follows: First, align the second connecting section 104 of the first section of the tube body 1 with the first connecting section 103 of the second section of the tube body 1, and align the mounting block 109 on the second connecting section 104 with the second mounting groove 107 on the first connecting section 103; finally, insert the second connecting section 104 of the first section of the tube body 1 into the first mounting groove 105 of the first connecting section 103 of the second section of the tube body 1, and tighten the locking member 108 by rotation to realize the installation between the two adjacent sections of the tube.
[0045] In summary, by providing first reinforcing ribs 2 and second reinforcing ribs 3 in the axial and circumferential directions of the tube body 1, the structural strength of the entire sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure is improved. Compared with existing tube structures, this tube structure strengthens the structural strength from two directions through first reinforcing ribs 2 and second reinforcing ribs 3 in two different directions, thereby improving the compressive strength of the tube and preventing the tube from bending and deforming under pressure, thus increasing the service life of the sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure. In addition, the reinforcing plate 4 can strengthen the structural strength of other areas of the tube to prevent bending and deformation under pressure such as trampling, thereby further improving the service life of the sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure.
[0046] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.
Claims
1. A structure for a large-diameter, thin-walled, low-thermal-expansion tube in a sodium-cooled fast reactor, characterized in that: include: Pipe body (1), and Multiple first reinforcing ribs (2) are embedded in the pipe body (1) and the multiple first reinforcing ribs (2) are evenly distributed along the axial direction of the pipe body (1); Multiple second reinforcing ribs (3) are embedded in the pipe body (1). The second reinforcing ribs (3) are connected to the first reinforcing ribs (2). An accommodating space is formed between two adjacent first reinforcing ribs (2) and two adjacent second reinforcing ribs (3). Multiple second reinforcing ribs (3) are evenly distributed along the circumferential direction of the pipe body (1). Multiple reinforcing plates (4) are embedded in the pipe body (1), and each reinforcing plate (4) fills the receiving space formed between two adjacent first reinforcing ribs (2) and two adjacent second reinforcing ribs (3).
2. The sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure as described in claim 1, characterized in that: The second reinforcing rib (3) passes through the first reinforcing rib (2) and is connected to the first reinforcing rib (2).
3. The sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure as described in claim 1, characterized in that: The first reinforcing rib (2) has a circular cross-sectional shape along the radial direction of the pipe body (1), and the diameter of the first reinforcing rib (2) is d1; The second reinforcing rib (3) has a circular cross-sectional shape along the radial direction of the pipe body (1), and the diameter of the second reinforcing rib (3) is d2; d1 > d2.
4. The sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure as described in claim 1, characterized in that: The pipe body (1) includes: The middle section (101), two corrugated sections (102), a first connecting section (103), and a second connecting section (104) are respectively located at both ends of the middle section (101) and are respectively installed on the two end faces of the middle section (101). The first connecting section (103) and the second connecting section (104) are respectively installed on the end faces of the two corrugated sections (102) away from the middle section (101). The two adjacent sections of the pipe body (1) are connected by the first connecting section (103) and the second connecting section (104).
5. The sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure as described in claim 4, characterized in that: The first reinforcing rib (2), the second reinforcing rib (3) and the reinforcing plate (4) are all embedded in the middle section (101).
6. The sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure as described in claim 4, characterized in that: The length of the middle section (101) is L1, the length of the corrugated section (102) is L2, the length of the first connecting section (103) is L3, and the length of the second connecting section (104) is L4. L1 > L2 > L3 > L4.
7. The sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure as described in claim 4, characterized in that: The first connecting section (103) has a first mounting groove (105), and a sealing gasket (106) is embedded in the first mounting groove (105); The second connecting segment (104) of the preceding pipe body (1) is inserted into the first mounting groove (105) of the following pipe body (1) so that the two adjacent pipe body segments (1) are connected.
8. The sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure as described in claim 4, characterized in that: The end face of the first connecting segment (103) near the axis of the middle segment (101) is an inclined surface, and the inclined surface is inclined to the side near the axis of the middle segment (101).
9. The sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure as described in claim 7, characterized in that: The first connecting segment (103) has a second mounting groove (107) on one end face away from the axis of the intermediate segment (101), and the first connecting segment (103) is threadedly connected to the position of the second mounting groove (107) with a locking member (108), and the outer wall of the second connecting segment (104) is provided with a mounting block (109). The second mounting slot (107) has multiple openings, and the multiple second mounting slots (107) are distributed in a ring with equal spacing. The locking member (108) and the mounting block (109) correspond one-to-one with the second mounting slot (107). The second connecting segment (104) of the preceding pipe body (1) is inserted into the first mounting groove (105) of the following pipe body (1), and the mounting block (109) of the preceding pipe body (1) is inserted into the second mounting groove (107) of the following pipe body (1), and the locking member (108) of the preceding pipe body (1) is inserted into the second connecting segment (104) of the following pipe body (1), so that the two adjacent pipe body segments (1) are connected.
10. The sodium-cooled fast reactor large-diameter thin-walled low-thermal-expansion tube structure as described in claim 4, characterized in that: The inner walls of the middle section (101), the corrugated section (102), the first connecting section (103), and the second connecting section (104) are all provided with a corrosion-resistant layer (5).