Channel structure and heavy water tank for single crystal silicon irradiation

Abstract

The disclosure provides a channel structure for single crystal silicon irradiation, comprising a body and at least one sealing piece, the body is cylindrical along its axial direction, the body is used for penetrating a through hole formed on a top plate of a heavy water tank and is used for carrying a single crystal silicon ingot device, the body has a first end extending into the inside of the through hole and a second end located outside the through hole; the body is provided with a first flange at the second end, the first flange is detachably connected with the top plate of the heavy water tank through a plurality of threaded connecting pieces; at least one sealing piece is clamped between the connecting end face of the first flange and the top plate of the heavy water tank, the sealing piece has an opening and is provided with a first contact plane and a second contact plane on the opposite sides of the opening, the first contact plane abuts against the bottom end face of the first flange, and the second contact plane abuts against the top face of the top plate of the heavy water tank.

Description

Technical Field

[0001] This disclosure relates to a channel structure for monocrystalline silicon irradiation and a heavy water tank. Background Technology

[0002] Neutron irradiation in a nuclear reactor is a critical step in the production of high-purity neutron-doped single-crystal silicon (NTD-Silicon). The single-crystal silicon ingot is typically placed in the reactor core or reflector zone through irradiation channels. These irradiation channels need to penetrate the top plate of the reactor's heavy water tank; therefore, the connection and sealing between the channels and the top plate are critical safety barriers.

[0003] In existing technologies, the connection between the irradiation channels and the heavy water tank top plate is typically achieved through welding. However, the welding process can cause significant thermal deformation and residual stress in the heavy water tank top plate, affecting its structural integrity and long-term reliability. Furthermore, once the channels or seals require inspection, maintenance, or replacement, the disassembly and reinstallation of the welded connections are extremely complex and time-consuming, and may even cause secondary damage to the heavy water tank top plate, significantly increasing maintenance costs and reactor downtime.

[0004] In existing technologies, flange connections are still used to connect the irradiation channels to the top plate of the heavy water tank. However, the existing single-seal structure is insufficient to meet the high safety requirements of nuclear reactor environments, posing a risk of leakage due to a single failure.

[0005] Based on this, the inventors of this disclosure propose a channel structure and a heavy water tank for irradiation of single-crystal silicon, in order to solve one or more of the above-mentioned technical problems. Summary of the Invention

[0006] This disclosure solves the above-mentioned technical problems through the following technical solution: The first aspect of this disclosure provides a channel structure for irradiating single-crystal silicon, comprising: The body is cylindrical along its axial direction. The body is used to pass through a through hole in the top plate of the heavy water tank and to support a single crystal silicon ingot device. The body has a first end extending into the through hole and a second end located outside the through hole. The main body is provided with a first flange at the second end, and the first flange is detachably connected to the top plate of the heavy water tank through multiple threaded connectors. At least one sealing element is sandwiched between the connection end face of the first flange and the top plate of the heavy water tank. The sealing element has an opening and a first contact plane and a second contact plane are provided on opposite sides of the opening. The first contact plane abuts against the bottom end face of the first flange, and the second contact plane abuts against the top surface of the top plate of the heavy water tank.

[0007] This disclosure involves sandwiching a sealing element with an opening and a first contact plane and a second contact plane respectively on opposite sides of the opening between the connecting end faces of the first flange and the top plate of the heavy water tank. This allows the sealing element to form independent sealing contact surfaces on both sides of the opening, which tightly abut against the bottom end face of the first flange and the top surface of the heavy water tank top plate, respectively. Compared with the single-seal structure of the prior art, this sealing element, through its opening structure, can generate elastic deformation under pressure to compensate for minor deformations or surface defects of the mating surface. This achieves a reliable sealing effect under lower clamping force, effectively reducing the dependence of the seal on the flange clamping force and the stress concentration requirements of the connecting components, significantly improving the sealing reliability, and reducing the risk of leakage due to seal failure.

[0008] According to one embodiment of this disclosure, the opening is disposed facing the body side.

[0009] According to one embodiment of this disclosure, the first contact plane and / or the second contact plane are provided with support protrusions.

[0010] According to one embodiment of this disclosure, the included angle of the opening is less than 180 degrees.

[0011] According to one embodiment of this disclosure, the included angle of the opening is in the range of 30-60°.

[0012] According to one embodiment of this disclosure, the number of seals is at least two; Each pair of the seals forms a sealing unit, with the openings of the two seals of the sealing unit facing each other.

[0013] According to one embodiment of this disclosure, the sealing element is a metal sealing ring; A reinforcing ring is also fitted inside the seal.

[0014] According to one embodiment of this disclosure, the wall thickness of the shaft segment extending into the through hole is less than the wall thickness of the shaft segment extending out of the through hole.

[0015] According to one embodiment of this disclosure, a bearing mounting hole is provided at the bottom of the inner cavity of the main body, and the bearing mounting hole is used to install a bearing supporting the bottom end of the single crystal silicon ingot device.

[0016] According to one embodiment of this disclosure, the body is further provided with a second flange on the side of the second end opposite to the first end, and the single crystal silicon ingot device is detachably connected to the body through the second flange.

[0017] A second aspect of this disclosure provides a heavy water tank, comprising: The tank body has a heavy water tank top plate, and the heavy water tank top plate has at least one through hole; The pore structure for monocrystalline silicon irradiation described above is detachably installed at the through hole in the top plate of the heavy water tank. Attached Figure Description

[0018] The above and other features, properties and advantages of this disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein: Figure 1 A cross-sectional view at an angle of the channel structure for monocrystalline silicon irradiation provided in an embodiment of this disclosure; Figure 2 for Figure 1 A schematic diagram of one embodiment of a sealing element in a channel structure for monocrystalline silicon irradiation disclosed in this paper; Figure 3 for Figure 1 This is a schematic diagram of another embodiment of the sealing element in a channel structure for monocrystalline silicon irradiation disclosed by Nakamoto.

[0019] 1. Body; 11. First end; 12. Second end; 13. First flange; 14. Threaded connector; 15. Bearing mounting hole; 16. Bearing; 17. Second flange; 2. Top plate of heavy water tank; 21. Through hole; 3. Single crystal silicon ingot device; 4. Seal; 41. First contact plane; 42. Second contact plane; 43. Support protrusion; 44. Reinforcing ring; 5. Sealing unit. Detailed Implementation

[0020] The present disclosure will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present disclosure. However, the present disclosure can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present disclosure. Therefore, the scope of protection of the present disclosure should not be limited by the content of this specific embodiment.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and foregoing description of the drawings of this disclosure are intended to cover non-exclusive inclusion.

[0022] In existing technologies, there are two main methods for connecting the channel structure used for monocrystalline silicon irradiation to the heavy water tank top plate. One is welding. The welding process generates significant thermal deformation and residual stress on the heavy water tank top plate, which not only affects the structural integrity, dimensional accuracy, and long-term reliability of the heavy water tank top plate, but also may lead to the deterioration of the mechanical properties of the top plate material in the weld heat-affected zone, reducing its fatigue resistance and radiation resistance during long-term nuclear reactor operation. When the channel or sealing structure needs to be inspected, maintained, or replaced, the disassembly and reinstallation of the welded connection is extremely complex and time-consuming, often requiring mechanical cutting or grinding to remove the weld. During the operation, secondary damage to the heavy water tank top plate may even be caused, and foreign objects such as metal debris may be introduced, affecting the water quality in the heavy water tank and the safety of the reactor core, significantly increasing maintenance costs and downtime.

[0023] Secondly, there is the flange connection. However, existing flange connections mostly use non-metallic conventional sealing rings. When facing the harsh irradiation environment of a nuclear reactor, non-metallic sealing materials are prone to irradiation aging, embrittlement, or degradation, resulting in insufficient sealing reliability and the risk of media leakage due to a single failure. At the same time, due to the lack of an effective detachable sealing fit structure between the channel body and the heavy water tank top plate, the installation positioning of the seal between the flange and the top plate connection end face is not precise enough, and the fit is not tight enough. It is difficult to ensure the sealing effectiveness under low stress compression conditions. Moreover, conventional sealing rings mostly use line contact or point contact, which requires high manufacturing precision of the mating surfaces and has limited tolerance. Once there are slight machining marks or local flatness deviations on the flange or top plate sealing surface, it may lead to sealing failure, further limiting the safety and maintainability of the channel structure in long-term service.

[0024] Therefore, a single-crystal silicon irradiation channel structure is needed that can avoid large deformation of the heavy water tank top plate, facilitate disassembly and replacement, achieve reliable sealing between the flange and the top plate end face, and adapt to the long-term irradiation and high-temperature alternating conditions of nuclear reactors.

[0025] Reference Figure 1 The pore structure for monocrystalline silicon irradiation disclosed herein specifically includes a body 1, which is cylindrical along its axial direction and has an inner cavity with an opening on one side for accommodating the monocrystalline silicon ingot device 3 to be irradiated. The body 1 has a first end 11 and a second end 12 along its axial direction. The first end 11 extends into a through-hole 21, and the second end 12 is located outside the through-hole 21. The first end 11 is located inside the irradiation area of ​​the heavy water tank, and the second end 12 is located outside the heavy water tank, facilitating the installation, disassembly, and maintenance of the pores by operators at the top of the stack.

[0026] The main body 1 has a first flange 13 and a second flange 17 spaced axially at its second end 12. The second flange 17 is located above the first flange 13. The first flange 13 is detachably connected to the top plate 2 of the heavy water tank via multiple threaded connectors 14. The specific threaded connectors 14 can be bolts, screws, etc., and their type, size, and quantity can be selected according to actual needs and are not limited here. The second flange 17 is detachably connected to the monocrystalline silicon ingot device 3 via multiple threaded connectors 14. The first flange 13 is used to achieve a sealing connection between the main body 1 and the top plate 2 of the heavy water tank, and the second flange 17 is used to achieve a load-bearing connection between the main body 1 and the monocrystalline silicon ingot device 3.

[0027] The main body 1 is detachably connected to the heavy water tank top plate 2, which fundamentally avoids the thermal deformation and residual stress problems of the heavy water tank top plate 2 caused by traditional welding processes. This ensures the structural integrity and dimensional accuracy of the heavy water tank top plate 2, allowing for convenient disassembly and reinstallation of the channel structure when inspection, maintenance, or replacement is required, significantly reducing maintenance costs and downtime. Furthermore, the detachable connection method facilitates complete replacement of the channels or seals 4 after they reach their designed service life, improving the maintainability and economy of the equipment throughout its entire lifespan.

[0028] To ensure the sealing between the main body 1 and the top plate 2 of the heavy water tank, this disclosure provides at least one sealing element 4 between the connecting end faces of the first flange 13 and the top plate 2 of the heavy water tank. The sealing element 4 has an opening and a first contact surface 41 and a second contact surface 42 on both sides of the opening. The first contact surface 41 abuts against the bottom end face of the first flange 13, and the second contact surface 42 abuts against the top surface of the top plate 2 of the heavy water tank. The sealing element 4 forms two elastic arms on both sides of the opening. The sealing element 4 forms surface contact seals with the bottom end face of the first flange 13 and the top surface of the top plate 2 of the heavy water tank through the two elastic arms, so that the sealing element 4, as an integral elastic element, provides sealing pressure in both the upper and lower directions simultaneously.

[0029] Compared to line or point contact sealing, the arrangement of the first contact plane 41 and the second contact plane 42 allows for planar contact, which distributes the clamping force over a larger contact area. Under the same bolt preload, this significantly reduces the peak pressure per unit area of ​​the contact surface. This avoids plastic deformation or crushing failure of the seal 4 caused by localized stress concentration, thus establishing a reliable surface seal even under low clamping force. In other words, this disclosure achieves a sealed connection between the heavy water tank top plate 2 and the first flange 13 with a lower bolt preload. The lower bolt preload reduces the stress level requirements for the heavy water tank top plate 2 and the first flange 13, which helps reduce the risk of creep deformation caused by long-term high preload on the heavy water tank top plate 2.

[0030] Moreover, compared to line seals or point seals, planar contact requires lower manufacturing precision for the mating surfaces and has a larger tolerance margin. This allows minor machining marks, uneven surface roughness, or local flatness deviations within a certain range on the bottom face of the first flange 13 and the top surface of the heavy water tank 2 to be covered by the planar contact, thus preventing immediate loss of sealing function due to local surface defects. This reduces the processing cost and calibration difficulty of the connection face between the first flange 13 and the heavy water tank top plate 2.

[0031] Please refer to Figure 2 Both the first contact plane 41 and the second contact plane 42 are provided with supporting protrusions 43. Specifically, Figure 2 In this design, support protrusions 43 are provided on both the first contact plane 41 and the second contact plane 42. However, the support protrusions 43 can also be provided on either the first contact plane 41 or the second contact plane 42. For example, support protrusions 43 can be provided only on the first contact plane 41 and not on the second contact plane 42; or, support protrusions 43 can be provided only on the second contact plane 42 and not on the first contact plane 41. The number, height, and shape of the support protrusions 43 can be designed according to the size specifications of the seal 4 and the sealing pressure requirements, and are not limited here.

[0032] The support protrusion 43 is provided on the first contact plane 41 and / or the second contact plane 42 so that when the first flange 13 is pressed down by the threaded connection 14, the support protrusion 43, as a local protrusion structure on the contact plane, will first contact the bottom end face of the first flange 13 and / or the top surface of the heavy water tank top plate 2. As the clamping force continues to increase, the support protrusion 43 will convert part of the axial clamping force into a radial deformation force that causes the opening of the seal 4 to shrink inward or expand outward, thereby achieving a reliable seal under low clamping force conditions.

[0033] More importantly, the pre-deformation of the opening caused by the support protrusion 43 gives the seal 4 a stronger pressure self-tightening response capability. When the internal medium pressure increases, the pre-retracted opening can be expanded by the pressure to further tighten the mating surface; the pre-expanded opening can be further fitted to the bottom face of the first flange 13 and / or the top face of the heavy water tank top plate 2 under the pressure, so that it can still maintain an effective seal under pressure fluctuation conditions.

[0034] by Figure 2For example, with the support protrusion 43 as the fulcrum, when the first flange 13 is subjected to the clamping force of the threaded connection 14 and continues to increase, if the clamping force is biased towards the side of the support protrusion 43 facing the opening, then points A and B of the seal 4 will shrink inward towards each other, causing points E and F of the seal 4 to expand outward and contact the bottom end face of the first flange 13 and the top surface of the heavy water tank top plate 2 to form a seal. At this time, the seal 4 itself has two sealing areas, one is the position of the support protrusion 43; the other is the area of ​​points E and F of the seal 4. As the clamping force increases, these two sealing areas will become tighter, thereby improving the sealing reliability of the seal 4. Similarly, when the clamping force is biased towards the side of the support protrusion 43 away from the opening, points A and B of the seal 4 will expand outward, causing points C and D of the seal 4 to expand outward and contact the bottom face of the first flange 13 and the top face of the heavy water tank top plate 2 to form a seal. At this time, the seal 4 itself also has two sealing areas, namely the support protrusion 43 and the C and D areas of the seal 4. It can be seen that no matter which side of the support protrusion 43 the clamping force is biased towards, the seal 4 can automatically form two independent sealing areas through the elastic deformation of the opening, achieving a double sealing effect, thereby greatly improving the reliability and redundancy of the seal.

[0035] In one implementation, the included angle of the opening is less than 180 degrees.

[0036] By limiting the included angle of the opening, the seal 4 can maintain a non-closed elastic open ring structure. During the assembly and pressing process, the elastic arms on both sides of the opening can generate elastic deformation and accumulate rebound force, thereby forming a continuous adaptive pressing seal between the first flange 13 and the top plate 2 of the heavy water tank.

[0037] Furthermore, the included angle of the opening ranges from 30 to 60°.

[0038] Limiting the opening angle to 30-60° ensures that the opening angle of seal 4 guarantees sufficient elastic restoring force for the elastic arm, while preventing insufficient elastic deformation capacity or assembly difficulties due to an excessively narrow opening. This angle range allows seal 4 to achieve a suitable initial sealing pressure under low clamping conditions, while simultaneously enabling a self-tightening effect through the elastic expansion of the opening when the internal medium pressure increases. This balances the effectiveness of low-pressure sealing with the sealing margin under high-pressure conditions, which is beneficial for seal 4 to maintain a reliable seal during long-term irradiation service in nuclear reactors.

[0039] Optionally, the seal 4 is a metal sealing ring, and a reinforcing ring 44 is also provided on the inner side of the seal 4.

[0040] Seal 4 uses a metal sealing ring, which can withstand the stringent requirements of long-term neutron irradiation and high-temperature environment in nuclear reactors on sealing materials, avoiding the aging, embrittlement, or radiation degradation problems that may occur with non-metallic sealing materials under strong irradiation. The metal sealing ring has good elastic recovery performance and temperature and pressure resistance, and can achieve reliable metal sealing under relatively low clamping force, reducing the stress concentration requirements of the heavy water tank top plate 2 and flange connection parts. At the same time, its structural strength and durability are also conducive to maintaining stable sealing performance throughout the entire life of the reactor.

[0041] A reinforcing ring 44 is further provided inside the sealing element 4, which provides radial support to the metal sealing ring. This prevents excessive radial deformation or collapse of the metal sealing ring during the tightening process, ensuring that the sealing ring maintains the correct sealing contact posture after assembly and tightening. Furthermore, under the long-term irradiation and temperature alternation conditions of a nuclear reactor, the metal sealing ring may experience irradiation creep or stress relaxation, leading to a gradual decrease in elastic recovery force. The radial support of the reinforcing ring 44 compensates for the deformation loss caused by material relaxation in the metal sealing ring, allowing it to maintain effective clamping force on the bottom face of the first flange 13 and the top face of the heavy water tank top plate 2 even after relaxation. This extends the effective service life of the sealing element 4 and ensures sealing reliability throughout its entire lifespan. In addition, the reinforcing ring 44, fitted inside the sealing ring, also serves as an installation positioning reference during assembly, making the installation position of the sealing ring between the first flange 13 and the top plate more precise and consistent, avoiding sealing failure due to sealing ring misalignment or tilting. Meanwhile, the presence of the reinforcing ring 44 gives the seal 4 better overall rigidity, making it less prone to deformation or damage during handling and assembly, which helps improve assembly quality and the reliability of on-site operation.

[0042] Please refer to Figure 3 The number of seals 4 is at least two, and each pair of seals 4 forms a sealing unit 5. The openings of the two seals 4 in the sealing unit 5 are arranged facing each other. The openings facing each other mean that the opening of one seal 4 faces a first direction, and the opening of the other seal 4 faces a second direction opposite to the first direction. The two seals 4 are arranged in a mirror-symmetrical manner in the axial section, so that their respective open ends are adjacent to each other and their closed ends are far apart from each other.

[0043] That is, multiple sealing units 5 can be provided between the connection end face of the first flange 13 and the top plate 2 of the heavy water tank, and thus multiple sealing elements 4 can be provided. The specific number of sealing units 5 and sealing elements 4 can be selected according to actual needs and is not limited here. Increasing the number of sealing units 5 can further improve the sealing redundancy between the first flange 13 and the top plate 2 of the heavy water tank.

[0044] by Figure 3For example, the two seals 4 can form a redundant sealing structure with two opposing openings. When one seal 4 fails due to irradiation aging, surface wear or pressure fluctuations, the other seal 4 can still provide an effective seal independently, thus realizing a single-failure prevention design and significantly improving the sealing reliability and fault tolerance of the duct structure.

[0045] Furthermore, the two seals 4 are positioned with their openings facing each other, and under different pressure directions, they respectively bear the effects of compression or expansion, thus providing a complementary sealing effect and further enhancing the sealing effect between the first flange 13 and the heavy water tank top plate 2. Specifically, when the medium pressure acts on the sealing unit 5 from a certain direction, the opening of one of the seals 4 tends to expand under pressure, and its elastic arm expands outward, increasing the compression force with the mating surfaces (the bottom face of the first flange 13 and / or the top face of the heavy water tank top plate 2); while the opening of the other seal 4 tends to contract under the same pressure direction, its elastic arm can still maintain a basic seal by relying on the assembly preload. When the pressure direction is reversed, the roles of the two seals 4 are interchanged, thereby achieving complementary sealing under bidirectional pressure conditions, effectively enhancing the adaptability of the first flange 13 and the heavy water tank top plate 2 to pressure fluctuations and directional changes.

[0046] For example, when pressure acts from the inside of the heavy water tank outwards, the inward-facing seal 4, with pressure entering its inner cavity from the open end, expands the elastic arm, causing it to press more tightly against the bottom face of the first flange 13 and the top face of the heavy water tank. The outward-facing seal 4, with pressure acting on the outer wall, causes its opening to tend to contract, but the basic seal can still be maintained by the assembly preload.

[0047] When the pressure direction is reversed, such as during external pressure leak detection or negative pressure transients, the roles of the two seals 4 are interchanged.

[0048] The two seals 4 disclosed herein have a self-tightening effect that is passively triggered on the side of the seal 4 facing away from the main body 1. The better the self-tightening effect of the seal 4 closer to the main body 1, the weaker the self-tightening effect of the outer seal 4. As the seal 4 closer to the main body 1 gradually fails, the outer seal 4 will automatically increase its self-tightening effect, thereby achieving complementary sealing.

[0049] Please continue to refer to Figure 1 The wall thickness of the shaft section that extends into the through hole 21 is less than the wall thickness of the shaft section that extends out of the through hole 21.

[0050] This configuration effectively reduces the absorption and scattering losses of neutrons on the channel walls, increases the neutron irradiation dose that penetrates the channel walls to reach the single-crystal silicon ingot, thereby shortening the irradiation time, improving irradiation efficiency, and increasing production capacity.

[0051] Meanwhile, the thicker wall section extending outward from the through hole 21 can ensure the structural strength and load-bearing capacity of the connection area between the main body 1 and the top plate 2 of the heavy water tank, so that it will not undergo plastic deformation or instability under the action of bolt pre-tightening force and gravity load of the single crystal silicon ingot device 3.

[0052] Furthermore, a bearing mounting hole 15 is provided at the bottom of the inner cavity of the main body 1. The bearing mounting hole 15 is used to install the bearing 16 supporting the bottom end of the single crystal silicon ingot device 3.

[0053] By opening a bearing mounting hole 15 at the bottom of the inner cavity of the main body 1, the single crystal silicon ingot device 3 can achieve precise radial alignment and axial positioning through the bearing 16 during the rotating irradiation process. This effectively avoids eccentric swinging, scraping and wear between the single crystal silicon ingot device 3 and the inner wall of the channel during rotation, thereby significantly improving the operational reliability of the channel structure, extending the service life of the single crystal silicon ingot device 3, and ensuring the safety and stability of the nuclear reactor during long-term irradiation operation.

[0054] This disclosure also proposes a heavy water tank, including a tank body and the above-mentioned channel structure. The tank body has a heavy water tank top plate 2, and at least one through hole 21 is provided on the heavy water tank top plate 2. The channel structure is detachably installed at the through hole 21.

[0055] The heavy water tank can be detachably installed with the above-mentioned channel structure through the through hole 21 on the top plate 2 of the heavy water tank. On the basis of realizing the original core cooling and reflection functions, it integrates advantages such as no welding deformation, detachable assembly and maintenance, dual redundant sealing to prevent single failure, low stress surface sealing, high irradiation efficiency, and low wear and long life. It provides a safe, reliable, efficient and maintainable complete equipment-level solution for monocrystalline silicon irradiation operations in nuclear reactors.

[0056] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "joining", and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can also refer to a mechanical connection. For those skilled in the art, the specific meaning of the above terms in the embodiments of this disclosure can be understood according to the specific circumstances.

[0057] This disclosure uses specific terms to describe embodiments of the present disclosure. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the present disclosure. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the present disclosure can be appropriately combined.

[0058] While this disclosure has described above with reference to preferred embodiments, it is not intended to limit the scope of this disclosure. Any changes and modifications can be made by those skilled in the art without departing from the spirit and scope of this disclosure. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this disclosure, without departing from the content of the technical solution, fall within the protection scope defined by the claims of this disclosure.

Claims

1. A channel structure for irradiating single-crystal silicon, characterized in that, include: The body is cylindrical along its axial direction. The body is used to pass through a through hole in the top plate of the heavy water tank and to support a single crystal silicon ingot device. The body has a first end extending into the through hole and a second end located outside the through hole. The main body is provided with a first flange at the second end, and the first flange is detachably connected to the top plate of the heavy water tank through multiple threaded connectors. Two sealing elements are sandwiched between the connection end face of the first flange and the top plate of the heavy water tank. The sealing elements have an opening and a first contact plane and a second contact plane are provided on opposite sides of the opening. The first contact plane abuts against the bottom end face of the first flange, and the second contact plane abuts against the top surface of the top plate of the heavy water tank. Two of the seals form a sealing unit, and the openings of the two seals in the sealing unit are arranged facing each other; The sealing element is a metal sealing ring; A reinforcing ring is also fitted inside the sealing element; The first contact plane and / or the second contact plane are provided with support protrusions.

2. The channel structure for single-crystal silicon irradiation according to claim 1, characterized in that, The wall thickness of the shaft section extending into the through hole is less than the wall thickness of the shaft section extending out of the through hole.

3. The channel structure for single-crystal silicon irradiation according to claim 1, characterized in that, The bottom of the inner cavity of the main body is provided with a bearing mounting hole, which is used to install a bearing supporting the bottom end of the single crystal silicon ingot device.

4. The channel structure for single-crystal silicon irradiation according to claim 1, characterized in that, The main body is further provided with a second flange on the side of the second end opposite to the first end, and the single crystal silicon ingot device is detachably connected to the main body through the second flange.

5. A heavy water tank, characterized in that, include: The tank body has a heavy water tank top plate, and the heavy water tank top plate has at least one through hole; The channel structure for monocrystalline silicon irradiation as described in any one of claims 1-4, wherein the channel structure for monocrystalline silicon irradiation is detachably installed at the through hole in the top plate of the heavy water tank.

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