A crucible structure and thermal field

Abstract

This application discloses a crucible side structure and a thermal field, relating to the field of photovoltaic technology. The crucible side structure is used to support a crucible in a thermal field, including a spliced ​​crucible side body and a crucible support. The crucible side body includes a first crucible side and a second crucible side. The crucible side body has a straight wall structure near the opening side of the crucible side structure and a side wall structure with an R-angle connected thereto. The first crucible side has a first curved portion at one end near the second crucible side, and the first curved portion and the second crucible side form a side wall structure. A heat-conducting groove is formed in the side wall structure, one end of which is connected to the thermal field outside the crucible side structure, and the other end is not connected to the inner surface of the crucible side structure. The tangent on the outer side of the first curved portion has a first included angle α with the horizontal plane, with a value range of 20°≤α≤90°. The first inclined annular surface on the outer side of the second crucible side has a second included angle β with the horizontal plane, with a value range of 15°~20°. This design facilitates single-person assembly and disassembly, promotes heat exchange between the crucible and the outside environment, and improves production efficiency.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and more specifically, to a crucible side structure and thermal field. Background Technology

[0002] In the large-scale production of monocrystalline silicon, the main production equipment is the monocrystalline furnace.

[0003] In the hot zone of a single crystal furnace, the outer surface of the quartz crucible holding the molten silicon and silicon rods is covered by a support structure, also known as the crucible side structure. Currently used crucible side structures consist of two parts: the crucible support and the crucible side. The crucible side is often a single-piece structure, making it quite heavy. Disassembly requires personnel to first use crucible side clamps to remove the crucible side, and then work together to remove the crucible support. This is difficult for a single person. Furthermore, because the crucible side is a solid, one-piece structure with uniform wall thickness, heat exchange is not conducive, resulting in an ineffective longitudinal temperature gradient within the crucible and poor oxygen reduction. Summary of the Invention

[0004] In view of this, this application provides a crucible side structure and thermal field, which facilitates single-person assembly and disassembly, promotes heat exchange between the crucible and the outside environment, and improves production efficiency.

[0005] In a first aspect, this application provides a crucible side structure for supporting a crucible in a hot field. The crucible side structure includes a crucible side body and a crucible support assembled from parts. The crucible support is disposed at the bottom of the crucible side structure. The crucible side body includes a first crucible side and a second crucible side assembled from parts. The first crucible side is near the opening side of the crucible side structure, and the second crucible side is near the crucible support. The first crucible side, the second crucible side, and the crucible support are used to cooperate with each other to support the crucible. Wherein:

[0006] The crucible body has a straight wall structure near the opening side of the crucible structure and a side wall structure with an R-angle connected to the straight wall structure. The thickness of the side wall structure is uneven. The first crucible body has a first curved part at the end near the second crucible body. The first curved part and the second crucible body form a side wall structure. A heat conduction groove is opened in the side wall structure. One end of the heat conduction groove is connected to the heat field outside the crucible body structure, and the other end is not connected to the inner surface of the crucible body structure.

[0007] The tangent on the outer side of the first curved part has a first included angle α with the horizontal plane. The value of the first included angle α is 20°≤α≤90°. The first included angle α gradually increases along the direction from the crucible support to the opening of the crucible side structure.

[0008] The outer surface of the second crucible side has a first inclined annular surface, and the first inclined annular surface has a second included angle β with the horizontal plane. The value range of the second included angle β is: 15°≤β≤20°. The vertical distance between the first inclined annular surface and the horizontal plane gradually increases along the side of the second crucible side that is closer to the crucible support and the side that is closer to the first crucible side.

[0009] Optionally, where:

[0010] The side of the first curved portion that contacts the second crucible side has multiple evenly distributed blind holes, and the side of the second crucible side that contacts the first curved portion has multiple evenly distributed through holes that correspond one-to-one with the blind holes. Each blind hole is connected to the corresponding through hole through its open end, forming a heat-conducting groove.

[0011] Optionally, where:

[0012] The blind hole has a closed end opposite to the open end, and the horizontal distance L between the closed end and the inner surface of the first crucible side is in the range of 6mm≤L≤15mm.

[0013] Optionally, where:

[0014] The side of the first curved portion that contacts the second crucible side has a second inclined annular surface and a first horizontal annular surface that are in contact, and the opening end of the blind hole is located on the first horizontal annular surface; the side of the second crucible side that contacts the first curved portion has a first boss, the first boss has a second horizontal annular surface that contacts the first curved portion, a through hole passes through the first boss, and one side opening of the through hole is located on the second horizontal annular surface.

[0015] The side of the second crucible that contacts the first curved portion also has a third inclined annular surface that is in contact with the second horizontal annular surface. The second inclined annular surface and the third inclined annular surface are parallel to each other, and the first horizontal annular surface and the second horizontal annular surface are parallel to each other.

[0016] Optionally, where:

[0017] At least one blind hole extends in a vertical direction; and / or, at least one through hole extends in a vertical direction.

[0018] Optionally, where:

[0019] The number of blind holes and through holes ranges from 20 to 50, and the diameter Φ of both blind holes and through holes ranges from 5mm to 8mm.

[0020] When the blind hole extends in a vertical direction, the value of the length d1 of the blind hole in the vertical direction is: 20mm≤d1≤50mm; when the through hole extends in a vertical direction, the value of the length d2 of the through hole in the vertical direction is: 20mm≤d2≤50mm.

[0021] Optionally, where:

[0022] The crucible side structure also includes multiple auxiliary support parts disposed on the outer side of the first inclined annular surface, and the auxiliary support parts are evenly distributed on the outer side of the first inclined annular surface.

[0023] Optionally, where:

[0024] The auxiliary support includes a long strip of reinforcing rib, and the extension direction of the auxiliary support is the same as the extension direction of the generatrix of the first inclined annulus.

[0025] Optionally, where:

[0026] The side of the second crucible that contacts the crucible support has a fourth inclined annular surface and a third horizontal annular surface. The side of the crucible support that contacts the second crucible side has a second protrusion. The second protrusion has a fourth horizontal annular surface that contacts the second crucible side. The side of the crucible support that contacts the second crucible side also has a fifth inclined annular surface that contacts the fourth horizontal annular surface. The fourth inclined annular surface and the fifth inclined annular surface abut in parallel. The third horizontal annular surface and the fourth horizontal annular surface abut in parallel.

[0027] Secondly, this application also provides a hot zone, which includes the crucible side structure described in the first aspect.

[0028] Compared with the prior art, the crucible side structure and thermal field provided in this application achieve at least the following beneficial effects:

[0029] Compared to the existing two-part crucible side structure, the crucible side structure provided in this application comprises three parts: a first crucible side, a second crucible side, and a crucible support. This breaks down the two larger and heavier parts of the existing technology into three smaller components, simplifying the structure and facilitating single-person assembly and disassembly, thus accelerating the assembly and disassembly process. Furthermore, it allows for replacement of components based on their wear and tear, saving costs. In the existing technology, the crucible side is thicker at the radius (R-angle). This application divides the radius (R-angle) and part of the crucible support structure of the existing crucible side into a second crucible side, and increases the first included angle α between the outer side of the first curved portion and the horizontal plane, and the second included angle β between the first inclined annular surface and the horizontal plane. Increasing the first included angle α reduces the thickness of the first curved portion, with a more significant thinning effect near the straight wall structure. Similarly, increasing the second included angle β thins the second crucible side, with a more significant thinning effect near the first crucible side. Since the sidewall structure with the radius (R-angle) is composed of the first curved portion and the second crucible side... As the first curved section and the second crucible side are thinned respectively, the sidewall structure also achieves a reduction in thickness, with the thinning degree and effect at the R-corner position being more significant. This not only reduces the weight of the crucible side structure, making it easier for a single person to assemble and disassemble, further accelerating the assembly and disassembly speed of the crucible side structure, but also increases the heat transfer rate between the external and internal thermal fields of the crucible side structure. The sidewall structure of the crucible side structure has heat-conducting grooves, one end of which connects to the external thermal field of the crucible side structure, while the other end does not connect to the inner surface of the crucible side structure, further accelerating the heat transfer rate between the external and internal thermal fields of the crucible side structure. Furthermore, in existing crucible sides, due to their uniform thickness and overall relatively thick structure, thinning is generally performed as a whole. However, the crucible side structure provided in this application is divided into three parts, allowing for localized thinning only at the locations of the first curved section and the first inclined annular surface to reduce the thickness at the R-corner position, thus reducing the difficulty and cost of thinning.

[0030] Of course, any product implementing this application does not necessarily need to achieve all of the technical effects described above at the same time.

[0031] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0032] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0033] Figure 1 The diagram shown is a schematic representation of the structure of the crucible side in the prior art.

[0034] Figure 2The diagram shown is a schematic diagram of a crucible support structure in the prior art;

[0035] Figure 3 The figure shown is a cross-sectional view of the crucible side structure provided in an embodiment of this application;

[0036] Figure 4 The diagram shown is a structural schematic of the first crucible side provided in an embodiment of this application;

[0037] Figure 5 The diagram shown is a structural schematic of the second crucible side provided in an embodiment of this application;

[0038] Figure 6 The diagram shown is a schematic diagram of the structure of the crucible holder provided in an embodiment of this application. Detailed Implementation

[0039] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0040] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0041] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0042] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0044] In the large-scale production of monocrystalline silicon, the main production equipment is the monocrystalline furnace.

[0045] Figure 1 The diagram shown is a schematic representation of the structure of the crucible side in the prior art. Figure 2 The diagram shown is a schematic diagram of a crucible support structure in the prior art.

[0046] In the hot zone of a single crystal furnace, the outer surface of the quartz crucible holding the molten silicon and silicon rods is covered with a support structure to hold the quartz crucible in place; this structure is also known as the crucible side structure. For example... Figure 1 and Figure 2As shown, the crucible side structure currently in use consists of two parts: the crucible support structure 11 and the crucible side 10. The crucible side 10 is mostly a one-piece structure, so it is quite bulky. When disassembling, the disassembly personnel need to first use the crucible side clamp to remove the crucible side 10, and then work together to remove the crucible support structure 11. It is difficult to operate when a single person is disassembling. On the other hand, since the crucible side 10 is a one-piece solid structure and the wall thickness of the crucible side 10 is uniform, it is not conducive to heat exchange, which makes it impossible to effectively form a longitudinal temperature gradient inside the crucible, resulting in poor oxygen reduction effect.

[0047] Figure 3 The figure shown is a cross-sectional view of the crucible side structure provided in an embodiment of this application; Figure 4 The diagram shown is a structural schematic of the first crucible side provided in an embodiment of this application; Figure 5 The diagram shown is a structural schematic of the second crucible side provided in an embodiment of this application; Figure 6 The diagram shown is a schematic diagram of the structure of the crucible holder provided in an embodiment of this application.

[0048] To solve the above technical problems, such as Figures 3-6 As shown, this application proposes a crucible side structure 2 for supporting the crucible in a hot field, which facilitates single-person assembly and disassembly, promotes heat exchange between the crucible and the outside environment, and improves production efficiency.

[0049] like Figures 3-6 As shown, the crucible side structure 2 includes a crucible side body 21 and a crucible support 22 assembled together; the crucible support 22 is located at the bottom of the crucible side structure 2, and the crucible side body 21 includes a first crucible side 211 and a second crucible side 212 assembled together, the first crucible side 211 being closer to the opening side of the crucible side structure 2, and the second crucible side 212 being closer to the crucible support 22. The first crucible side 211, the second crucible side 212, and the crucible support 22 are used to cooperate with each other to support the crucible; wherein:

[0050] The crucible body 21 has a straight wall structure near the opening side of the crucible structure 2 and a side wall structure with an R-angle connected to the straight wall structure. The thickness of the side wall structure is uneven. The first crucible body 211 has a first curved part at one end near the second crucible body 212. The first curved part and the second crucible body 212 form a side wall structure. A heat conduction groove 23 is opened in the side wall structure. One end of the heat conduction groove 23 is connected to the heat field outside the crucible structure 2, and the other end is not connected to the inner surface of the crucible structure 2.

[0051] The tangent on the outer side of the first curved part has a first included angle α with the horizontal plane. The value of the first included angle α is 20°≤α≤90°. The first included angle α gradually increases along the direction from the crucible support 22 to the opening of the crucible side structure 2.

[0052] The outer surface of the second crucible side 212 has a first inclined annular surface 2121. The first inclined annular surface 2121 has a second included angle β with the horizontal plane. The value of the second included angle β is in the range of 15°≤β≤20°. The second crucible side 212 points from the side near the crucible support 22 to the side near the first crucible side 211. The vertical distance between the first inclined annular surface 2121 and the horizontal plane gradually increases.

[0053] In specific implementation, such as Figures 3-6 As shown, the crucible is located inside the crucible side structure 2, and the outer surface of the crucible is in contact with the inner surface of the crucible side structure 2. During the melting process, the bottom heater located outside the crucible side structure 2 is in the open state, and the heat transferred by the heater is transferred from the heat field outside the crucible side structure 2 to the inner surface of the crucible side structure 2 by thermal radiation through the heat conduction groove 23 on the side wall structure. During the crystal pulling process, the bottom heater located outside the crucible side structure 2 is in the closed state, and the heat on the crucible is transferred from the inside of the crucible side structure 2 to the heat field outside the crucible side structure 2 by thermal radiation through the heat conduction groove 23 on the side wall structure.

[0054] From the above composition and specific implementation process of the crucible side structure 2, it can be seen that, as Figures 1-6As shown, compared with the existing two-part crucible side structure, the crucible side structure 2 provided in this application embodiment includes three parts: a first crucible side 211, a second crucible side 212, and a crucible support 22. This breaks down the two larger and heavier parts in the prior art into three smaller components, simplifying the structure and reducing the pressure of handling components during assembly and disassembly. This facilitates single-person assembly and disassembly operations and speeds up the assembly and disassembly rate of the crucible side structure 2. Furthermore, since the stress conditions and wear rates differ at different locations of the crucible side structure 2, the crucible support 22 wears out more slowly in actual use, while the contact area between the first crucible side 211 and the second crucible side 212 wears out faster. By dividing the crucible side structure 2 into three parts, the corresponding components can be replaced according to the wear conditions of different parts, saving costs.The sidewall structure formed by the second crucible side 212 and the first curved portion has an R-angle. In the prior art, the crucible side 10 is thicker at the R-angle position. In this embodiment, the R-angle of the crucible side 10 and a part of the crucible support structure 11 in the prior art are divided into the second crucible side 212. The first included angle α between the outer side of the first curved portion and the horizontal plane is adjusted to: 20°≤α≤90°. The range of the second included angle β between the first inclined annular surface 2121 of the outer surface of the second crucible side 212 and the horizontal plane is adjusted to: 15°≤β≤20°. Both of these are larger than the included angles in the prior art. In order to adapt to the shape of the crucible, the curvature of the inner surface of the crucible side structure 2 is not changed. As the first included angle α increases, the outer side of the first curved portion and the crucible side structure 2... As the distance between the inner surfaces shortens, the thickness at the first bend decreases. Furthermore, since the first included angle α gradually increases in the direction from the crucible support 22 to the opening of the crucible side structure 2, the thickness reduction effect of the first bend near the straight wall structure is more pronounced. As the second included angle β increases, without changing the curvature of the inner surface of the crucible side structure 2, the distance between the first inclined annular surface 2121 and the inner surface of the crucible side structure 2 gradually shortens, and the thickness of the second crucible side 212 gradually decreases. Moreover, since the vertical distance between the first inclined annular surface 2121 and the horizontal plane gradually increases along the direction from the side near the crucible support 22 to the side near the first crucible side 211 on the second crucible side 212, that is, as the second included angle β increases... As the thickness of the second crucible side 212 increases, the thinning of the second crucible side 212 near the first crucible side 211 becomes more pronounced. Furthermore, since the inclination angle of the first curved portion near the second crucible side 212 is essentially the same as the inclination angle of the second crucible side 212 near the first crucible side 211, the thickness of the first curved portion near the second crucible side 212 can also be reduced accordingly as the thickness of the second crucible side 212 near the first crucible side 211 decreases. Since the first curved portion and the second crucible side 212 together form a sidewall structure with an R-angle, the sidewall structure also achieves a thickness reduction as the thickness of the first curved portion and the second crucible side 212 decreases. The junction of the first crucible side 211 and the second crucible side 212 is where the thicker R-angle of the crucible side 10 in the prior art is located. At the location, the effect of thickness reduction is more obvious. This not only reduces the weight of the crucible side structure 2, making it easier for a single person to disassemble and assemble, but also further accelerates the disassembly and assembly speed of the crucible side structure 2. At the same time, the thinner sidewall at the R-corner position can also accelerate the heat transfer rate between the external and internal heat fields of the crucible side structure 2. When adjusting the first included angle α and the second included angle β, it is necessary to balance the thickness reduction and sufficient strength. If the thickness reduction is too large, the R-corner of the crucible side structure 2 will be too thin, and the strength of the crucible side structure 2 will be insufficient, making it easy to be damaged during use and adversely affecting production. If the thickness reduction is too small, the R-corner of the crucible side structure 2 will be too thick, the weight reduction will not be significant, the difficulty of single-person disassembly and assembly will be increased, and the improvement in heat transfer will not be significant.The sidewall structure of the crucible side structure 2 has a heat-conducting groove 23. One end of the heat-conducting groove 23 is connected to the heat field outside the crucible side structure 2, and the other end is not connected to the inner surface of the crucible side structure 2. This reduces the distance between the heat field outside the crucible side structure 2 and the inner surface of the crucible side structure 2, further accelerating the heat transfer rate between the external heat field and the internal heat field of the crucible side structure 2. Since the heat-conducting groove 23 is set on the sidewall structure, when the sidewall structure is thinned, the length of the heat-conducting groove 23 is also shortened accordingly, which improves the heat exchange capacity between the external heat field and the internal heat field of the crucible side structure 2. When the crucible is located inside the crucible side structure 2, during the melting process, the bottom heater outside the crucible side structure 2 is in the on state. The heat transferred by the heater can radiate heat from the thermal field outside the crucible side structure 2 to the inner surface of the crucible side structure 2 through the heat conduction grooves 23 on the side wall structure. This allows for faster heat transfer to the crucible, which is in close contact with the inner surface of the crucible side structure 2, increasing the melting efficiency and thus improving production efficiency. During the crystal pulling process, the bottom heater outside the crucible side structure 2 is in the off state. The heat on the crucible can radiate heat better from the inside to the outside of the crucible side structure 2 through the heat conduction grooves 23 on the side wall structure, accelerating the cooling of the crucible. In addition, in the existing crucible side 10, since the crucible side 10 has a uniform thickness and a relatively thick overall thickness, thinning is generally done as a whole. However, the crucible side structure 2 provided in this embodiment is divided into three parts, allowing for local thinning only at the locations of the first curved portion and the first inclined annular surface 2121 to reduce the thickness at the R-corner position, thus reducing the difficulty and cost of thinning.

[0055] It should be noted that, as the vertical distance between the first inclined annular surface 2121 and the horizontal plane gradually increases along the direction from the side near the crucible support 22 to the side near the first crucible support 211 on the second crucible side 212, when the second included angle β changes, the thickness of the second crucible side 212 at the position near the crucible support 22 does not change significantly, and the load-bearing capacity of the second crucible side 212 on the crucible does not change significantly.

[0056] For example, the thickness of the first curved portion near the second crucible side 212 can also be changed according to the outer diameter at the R-angle position, or it can be changed separately.

[0057] For example, the first included angle α can be 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, etc., and the second included angle β can be 15°, 16°, 17°, 18°, 19°, 20°, etc. These are just examples and are not specific limitations.

[0058] For example, in practical applications, the first included angle α at the junction of the first curved portion and the second crucible side 212 can be 27°.

[0059] As one possible implementation, such as Figures 3-5As shown, the side of the first curved portion that contacts the second crucible side 212 has a plurality of uniformly distributed blind holes 2111, and the side of the second crucible side 212 that contacts the first curved portion has a plurality of uniformly distributed through holes 2122 that correspond one-to-one with the blind holes 2111. Each blind hole 2111 is connected to the corresponding through hole 2122 through its open end, forming a heat-conducting groove 23.

[0060] Based on this, such as Figures 3-5 As shown, blind holes 2111 are evenly distributed on the side of the first curved portion that contacts the second crucible side 212. This ensures the strength of the crucible side structure 2 and its support for the crucible while maintaining the heat exchange rate. If the holes completely penetrate the first crucible side 211, the support for the crucible will be weakened, and the risk of silicon leakage will increase. Through holes 2122 are evenly distributed on the side of the second crucible side 212 that contacts the first curved portion. This allows heat to penetrate as much as possible into the crucible and to dissipate as much heat as possible. The heat-conducting groove 23, formed by the blind holes 2111 and the corresponding through holes 2122, is located at the contact position between the first crucible side 211 and the second crucible side 212. The heat-conducting groove 23 formed at the contact position between the first crucible side 211 and the second crucible side 212 is relatively close to the inner surface of the crucible side structure 2. Therefore, when the crucible is located inside the crucible side structure 2, the heat-conducting groove 23 is also relatively close to the crucible, which can accelerate the heat exchange rate between the crucible and the heat field located outside the crucible side structure 2. At the same time, as Figure 3 As shown, since the heat-conducting groove 23 is located close to the bottom of the crucible side structure 2, when the crucible is located inside the crucible side structure 2, the distance between the heat-conducting groove 23 and the bottom of the crucible is also relatively close. While accelerating the heat exchange between the crucible and the external heat field of the crucible side structure 2, it can also reduce the temperature of the bottom of the crucible. After the bottom of the crucible cools down, the natural convection from the bottom to the surface of the silicon melt weakens, improving the original longitudinal convection. Since the oxygen at the bottom of the crucible is transported to the surface of the solution by natural convection, the amount of oxygen transported is reduced accordingly after the crucible side cools down and the natural convection weakens, which has the effect of reducing oxygen content. The frequency of concentric circles on the silicon wafer produced is reduced, and defects are also reduced, thus improving the quality of the silicon wafer and thereby improving the quality and efficiency of the solar cell.

[0061] For example, when the feeding technology used in the single crystal furnace is the external multi-feed single crystal pulling technology (Outter Czochralski, OCZ), the crucible side structure provided in this application embodiment has a more significant effect in reducing oxygen content, and can reduce oxygen content by about 0.5 ppma.

[0062] In some examples, such as Figure 3 As shown, at least one blind hole 2111 extends in a vertical direction; and / or, at least one through hole 2122 extends in a vertical direction.

[0063] Based on this, such as Figure 3As shown, the extension direction of blind hole 2111 and through hole 2122 can be vertical, or it can be inclined or curved. When the extension direction of blind hole 2111 and through hole 2122 is vertical, the heat conduction groove 23 connected by blind hole 2111 and corresponding through hole 2122 also extends in the vertical direction. At this time, the length of heat conduction groove 23 is the shortest, and the heat transfer path is also the shortest. This can accelerate the heat conduction of the internal and external heat fields of the crucible side structure 2, which is beneficial to the heat exchange between the external heat field of the crucible side structure 2 and the crucible.

[0064] In some examples, such as Figures 3-5 As shown, the number of blind holes 2111 and through holes 2122 ranges from 20 to 50, and the diameter Φ of blind holes 2111 and through holes 2122 ranges from 5mm to 8mm.

[0065] When the extension direction of blind hole 2111 is vertical, the value range of the length d1 of blind hole 2111 in the vertical direction is: 20 mm ≤ d1 ≤ 50 mm; when the extension direction of through hole 2122 is vertical, the value range of the length d2 of through hole 2122 in the vertical direction is: 20 mm ≤ d2 ≤ 50 mm.

[0066] Based on this, such as Figures 3-5 As shown, the number of heat conduction grooves 23 ranges from 20 to 50, and the diameter ranges from 5 mm to 8 mm. If the number of blind holes 2111, through holes 2122 and heat conduction grooves 23 is too small or the diameter is too small, the desired heat leakage effect will not be achieved. If the number of blind holes 2111, through holes 2122 and heat conduction grooves 23 is too large or the diameter is too large, it will have an adverse effect on the strength of the crucible side structure 2, thereby affecting the efficiency and safety in the production process. When the extension direction of blind hole 2111 and through hole 2122 is vertical, the lengths d1 and d2 of blind hole 2111 and through hole 2122 in the vertical direction are both in the range of 20mm~50mm. This can achieve good heat leakage effect without changing the service life of crucible side structure 2. If the length of blind hole 2111 and through hole 2122 is too long, it may have an adverse effect on the strength and service life of crucible side structure 2, and may even cause silicon leakage. If the length of blind hole 2111 and through hole 2122 is too short, the heat transfer path is also shorter, and the heat exchange rate between the outside of crucible side structure 2 and crucible is also slower, which reduces the production rate and production quality.

[0067] For example, the number of blind holes, through holes, and heat conduction grooves can be 20, 30, 40, 50, etc., and the diameter of blind holes, through holes, and heat conduction grooves can be 5mm, 6mm, 7mm, 8mm, etc. When the extension direction of the blind hole is vertical, the length d1 of the blind hole in the vertical direction can be 20mm, 30mm, 40mm, 50mm, etc. When the extension direction of the through hole is vertical, the length d2 of the through hole in the vertical direction can be 20mm, 30mm, 40mm, 50mm, etc. The lengths of blind holes and through holes can be the same or different. This is only an example and is not specifically limited.

[0068] In some examples, such as Figure 3 As shown, the blind hole has a closed end opposite to the open end, and the horizontal distance L between the closed end and the inner surface of the first crucible side is in the range of 6mm≤L≤15mm.

[0069] Based on this, such as Figure 3 As shown, when setting the blind hole 2111, the penetration degree of the blind hole 2111 on the first crucible side 211 can be controlled by adjusting the horizontal distance L between the closed end of the blind hole 2111 and the inner surface of the first crucible side 211. This allows for the adjustment of the distance between the crucible and the heat-conducting groove 23 on the crucible side structure 2. If the distance between the crucible and the heat-conducting groove 23 is too close, the penetration degree of the blind hole 2111 will be too large, which will not only reduce the service life of the crucible side structure 2 and fail to provide good support for the crucible, but also increase the risk of silicon leakage. If the penetration degree of the blind hole 2111 is too small, that is, the distance between the crucible and the heat-conducting groove 23 is too far, the improvement of the heat exchange rate will not be significant, and a good heat leakage effect cannot be achieved.

[0070] For example, the horizontal distance L between the closed end and the inner surface of the first crucible side can be 6mm, 8mm, 10mm, 12mm, 15mm, etc. This is just an example and is not specifically limited.

[0071] As one possible implementation, such as Figures 3-5 As shown, the side of the first curved portion that contacts the second crucible side 212 has a second inclined annular surface and a first horizontal annular surface that are in contact, and the opening end of the blind hole 2111 is located on the first horizontal annular surface; the side of the second crucible side 212 that contacts the first curved portion has a first boss 2123, the first boss 2123 has a second horizontal annular surface that contacts the first curved portion, the through hole 2122 passes through the first boss 2123, and one side opening of the through hole 2122 is located on the second horizontal annular surface;

[0072] The side of the second crucible 212 that contacts the first curved portion also has a third inclined annular surface that is in contact with the second horizontal annular surface. The second inclined annular surface and the third inclined annular surface are parallel to each other, and the first horizontal annular surface and the second horizontal annular surface are parallel to each other.

[0073] Based on this, such as Figures 3-5 As shown, the first crucible side 211 and the second crucible side 212 overlap each other through two parallel abutting inclined annular surfaces and a horizontal annular surface. The side of the second crucible side 212 that contacts the first curved portion also has a first boss 2123, making the overlap with the first crucible side 211 more stable. The opening end of the blind hole 2111 is located on the first horizontal annular surface, the through hole 2122 penetrates the first boss 2123, and one side opening is located on the second horizontal annular surface. The blind hole 2111 and the through hole 2122 are interconnected by parallel abutting the first horizontal annular surface and the second horizontal annular surface. As the first included angle α increases, the thickness of the first curved portion decreases. The external heat field of the crucible side structure 2 can not only exchange heat with the internal heat field of the crucible side structure 2 through the heat conduction groove 23, but also transfer heat through the blind hole 2111 and the side wall of the first curved portion, thus accelerating the heat exchange rate between the internal and external heat fields of the crucible side structure 2. The other opening of the hole 2122 can be located on the annular surface of the first boss 2123 that is opposite to the second horizontal annular surface, or it can be located on the vertical annular surface of the first boss 2123 that is connected to the second horizontal annular surface. When the extension direction of the through hole 2122 is vertical, the other opening of the through hole 2122 is located on the annular surface of the first boss 2123 that is opposite to the second horizontal annular surface, that is, it penetrates the first boss 2123 in the vertical direction. At this time, the length d2 of the through hole 2122 in the vertical direction is the same as the height of the first boss 2123 in the vertical direction. Without changing the overall height and width of the second crucible side 212, as the second included angle β between the first inclined annular surface 2121 and the horizontal plane increases, not only does the second crucible side 212 become thinner, but the height of the first boss 2123 also decreases accordingly. Consequently, the length d2 of the through hole 2122 in the vertical direction also decreases, the heat transfer path is shortened, and the heat transfer between the crucible and the external thermal field of the crucible side structure 2 is further accelerated, thus improving production efficiency and production quality to a greater extent.

[0074] It should be noted that when the second included angle β is moderate and the height of the first protrusion in the vertical direction is large, the heat transfer between the crucible and the external thermal field of the crucible side structure is dominated by the heat conduction groove. When the second included angle β increases to a certain extent, the heat transfer becomes dominated by the side wall where the first inclined annular surface on the second crucible side is located.

[0075] As one possible implementation, such as Figures 3-5 As shown, the crucible side structure 2 also includes a plurality of auxiliary support parts 24 disposed on the outer side of the first inclined annular surface 2121, and the auxiliary support parts 24 are evenly distributed on the outer side of the first inclined annular surface 2121.

[0076] Based on this, such as Figures 3-5As shown, in the crucible side structure 2, the second crucible side 212 is mainly an inclined surface. Multiple evenly distributed auxiliary support parts 24 can be provided on the outer side of the first inclined annular surface 2121 of the second crucible side 212 to improve the stress distribution at the second crucible side 212, increase its strength and load-bearing capacity, and ensure normal and safe production. The first crucible side 211 is located at the upper opening of the crucible side structure 2, where the horizontal stress is relatively small. The crucible support 22, on the other hand, experiences almost entirely longitudinal forces. Furthermore, since the crucible side structure 2 is mainly made of carbon-carbon composite material, and the crucible support 22 has a crucible shaft providing support below it, no additional auxiliary support parts 24 are needed at the first crucible side 211 and the crucible support 22.

[0077] In some examples, the auxiliary support includes at least one of the following: a strip-shaped reinforcing rib, a well-shaped reinforcing rib, a fan-shaped reinforcing rib, an X-shaped reinforcing rib, a circular reinforcing rib, a composite reinforcing rib, an annular reinforcing rib, or an irregularly shaped reinforcing rib.

[0078] For example, such as Figures 3-5 As shown, when the auxiliary support 24 includes a long strip reinforcing rib, the extension direction of the auxiliary support 24 is the same as the extension direction of the generatrix of the first inclined annular surface 2121.

[0079] Based on this, when the auxiliary support 24 includes elongated reinforcing ribs, the extending direction of the auxiliary support 24 can be the same as the extending direction of the generatrix of the first inclined annular surface 2121. The length of the auxiliary support 24 can vary with the length of the outer straight edge of the second crucible side 212, giving the second crucible side 212 better strength and a longer service life. When the auxiliary support 24 includes elongated reinforcing ribs, the diameter of the auxiliary support 24 can be 5mm to 15mm, and the number can be 15 to 40, which can be adjusted according to the thickness of the second crucible side 212.

[0080] For example, when the auxiliary support includes long strip reinforcing ribs, the diameter of the auxiliary support can be 5mm, 7mm, 10mm, 13mm, 15mm, etc., and the number of auxiliary supports can be 15, 20, 30, 40, etc. This is just an example and is not a specific limitation.

[0081] As one possible implementation, such as Figures 3-6 As shown, the side of the second crucible side 212 that contacts the crucible support 22 has a fourth inclined annular surface and a third horizontal annular surface that are in contact. The side of the crucible support 22 that contacts the second crucible side 212 has a second boss 221. The second boss 221 has a fourth horizontal annular surface that contacts the second crucible side 212. The side of the crucible support 22 that contacts the second crucible side 212 also has a fifth inclined annular surface that is in contact with the fourth horizontal annular surface. The fourth inclined annular surface and the fifth inclined annular surface are in parallel contact, and the third horizontal annular surface and the fourth horizontal annular surface are in parallel contact.

[0082] Based on this, such as Figures 3-6 As shown, in the crucible side structure 2 provided in this application embodiment, the part of the prior art crucible support structure 11 that mainly bears the longitudinal pressure is split into the crucible support 22 in this application embodiment, which facilitates the control of the thickness of the crucible support 22 part. Since most of the force is in the crucible support 22 part, after splitting, the crucible support 22 part can be made thicker separately to obtain higher strength, without having to make the whole part thicker, thus avoiding the impact on the overall crucible side structure 2. At the same time, the process of making the part thicker separately after splitting is also more convenient. When the second included angle β between the first inclined annular surface 2121 on the outer surface of the second crucible side 212 and the horizontal plane increases, in order to make the overlapping second crucible side 212 and the crucible support 22 more stable, a second protrusion 221 can be provided on the side of the crucible support 22 that contacts the second crucible side 212.

[0083] Based on the same inventive concept, this application also provides a hot field, which includes the crucible side structure described in the first aspect or any possible implementation of the first aspect.

[0084] The beneficial effects of the thermal field are the same as those of the crucible side structure described in the first aspect or any possible implementation of the first aspect, and will not be repeated here.

[0085] In summary, the crucible side structure and thermal field provided in this application achieve at least the following beneficial effects:

[0086] Compared to the existing two-part crucible side structure, the crucible side structure provided in this application comprises three parts: a first crucible side, a second crucible side, and a crucible support. This breaks down the two larger and heavier parts of the existing technology into three smaller components, simplifying the structure and facilitating single-person assembly and disassembly, thus accelerating the assembly and disassembly process. Furthermore, it allows for replacement of components based on their wear and tear, saving costs. In the existing technology, the crucible side is thicker at the radius (R-angle). This application divides the radius (R-angle) and part of the crucible support structure of the existing crucible side into a second crucible side, and increases the first included angle α between the outer side of the first curved portion and the horizontal plane, and the second included angle β between the first inclined annular surface and the horizontal plane. Increasing the first included angle α reduces the thickness of the first curved portion, with a more significant thinning effect near the straight wall structure. Similarly, increasing the second included angle β thins the second crucible side, with a more significant thinning effect near the first crucible side. Since the sidewall structure with the radius (R-angle) is composed of the first curved portion and the second crucible side... As the first curved section and the second crucible side are thinned respectively, the sidewall structure also achieves a reduction in thickness, with the thinning degree and effect at the R-corner position being more significant. This not only reduces the weight of the crucible side structure, making it easier for a single person to assemble and disassemble, further accelerating the assembly and disassembly speed of the crucible side structure, but also increases the heat transfer rate between the external and internal thermal fields of the crucible side structure. The sidewall structure of the crucible side structure has heat-conducting grooves, one end of which connects to the external thermal field of the crucible side structure, while the other end does not connect to the inner surface of the crucible side structure, further accelerating the heat transfer rate between the external and internal thermal fields of the crucible side structure. Furthermore, in existing crucible sides, due to their uniform thickness and overall relatively thick structure, thinning is generally performed as a whole. However, the crucible side structure provided in this application is divided into three parts, allowing for localized thinning only at the locations of the first curved section and the first inclined annular surface to reduce the thickness at the R-corner position, thus reducing the difficulty and cost of thinning.

[0087] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A skimmer structure for supporting a crucible in a thermal field, characterized in that, The crucible side structure includes a crucible side body and a crucible support assembled from parts; the crucible support is located at the bottom of the crucible side structure, and the crucible side body includes a first crucible side and a second crucible side assembled from parts, the first crucible side being closer to the opening side of the crucible side structure, and the second crucible side being closer to the crucible support; the first crucible side, the second crucible side, and the crucible support are used to cooperate with each other to support the crucible; wherein: The crucible body has a straight wall structure near the opening side of the crucible structure and a side wall structure with an R-angle connected to the straight wall structure. The thickness of the side wall structure is uneven. The first crucible body has a first curved portion at one end near the second crucible body. The first curved portion and the second crucible body constitute the side wall structure. A heat-conducting groove is formed in the side wall structure. One end of the heat-conducting groove is connected to the heat field outside the crucible body structure, and the other end is not connected to the inner surface of the crucible body structure. The side of the first curved portion that contacts the second crucible body has a plurality of evenly distributed blind holes. The side of the second crucible body that contacts the first curved portion has a plurality of evenly distributed through holes that correspond one-to-one with the blind holes. Each blind hole is connected to the corresponding through hole through its opening end, thus forming the heat-conducting groove. The tangent on the outer side of the first curved portion has a first included angle α with the horizontal plane. The value of the first included angle α is in the range of 20°≤α≤90°. Along the direction from the crucible support to the opening of the crucible side structure, the first included angle α gradually increases. The outer surface of the second crucible side has a first inclined annular surface, and the first inclined annular surface has a second included angle β with the horizontal plane. The value range of the second included angle β is: 15°≤β≤20°. On the second crucible side, along the direction from the side closer to the crucible support to the side closer to the first crucible side, the vertical distance between the first inclined annular surface and the horizontal plane gradually increases.

2. The apron structure of claim 1, wherein, The blind hole has a closed end opposite to the open end, and the horizontal distance L between the closed end and the inner surface of the first crucible side is in the range of 6mm≤L≤15mm.

3. The apron structure of claim 1, wherein, The side of the first curved portion that contacts the second crucible side has a second inclined annular surface and a first horizontal annular surface that are in contact with each other, and the opening end of the blind hole is located on the first horizontal annular surface; the side of the second crucible side that contacts the first curved portion has a first boss, the first boss has a second horizontal annular surface that contacts the first curved portion, the through hole passes through the first boss, and one side opening of the through hole is located on the second horizontal annular surface. The side of the second crucible side that contacts the first curved portion also has a third inclined annular surface that is in contact with the second horizontal annular surface. The second inclined annular surface and the third inclined annular surface abut against each other in parallel, and the first horizontal annular surface and the second horizontal annular surface abut against each other in parallel.

4. The apron structure of claim 1, wherein At least one of the blind holes extends in a vertical direction; and / or, at least one of the through holes extends in a vertical direction.

5. A rib structure according to claim 4, wherein The number of blind holes and through holes ranges from 20 to 50, and the diameter Φ of both blind holes and through holes ranges from 5mm to 8mm. When the blind hole extends in a vertical direction, the length d1 of the blind hole in the vertical direction is in the range of 20 mm ≤ d1 ≤ 50 mm; when the through hole extends in a vertical direction, the length d2 of the through hole in the vertical direction is in the range of 20 mm ≤ d2 ≤ 50 mm.

6. The rib structure of claim 1, wherein The crucible side structure also includes a plurality of auxiliary support parts disposed on the outer side of the first inclined annular surface, the auxiliary support parts being evenly distributed on the outer side of the first inclined annular surface.

7. A rib structure according to claim 6, wherein The auxiliary support includes an elongated reinforcing rib, and the extension direction of the auxiliary support is the same as the extension direction of the generatrix of the first inclined annular surface.

8. The rib structure of claim 1, wherein The side of the second crucible side that contacts the crucible support has a fourth inclined annular surface and a third horizontal annular surface that are in contact. The side of the crucible support that contacts the second crucible side has a second protrusion. The second protrusion has a fourth horizontal annular surface that contacts the second crucible side. The side of the crucible support that contacts the second crucible side also has a fifth inclined annular surface that is in contact with the fourth horizontal annular surface. The fourth inclined annular surface and the fifth inclined annular surface are parallel to each other and abut against each other. The third horizontal annular surface and the fourth horizontal annular surface are parallel to each other and abut against each other.

9. A thermal field, characterized in that The thermal field includes the crucible side structure as described in any one of claims 1 to 8.

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