A high-rigidity, low-stress, lightweight silicon carbide cantilever propeller

Abstract

This utility model belongs to the field of cantilever propeller technology, and mainly relates to a high-rigidity, low-stress, and lightweight silicon carbide cantilever propeller. It includes a fixing component, a transition component, and a support component connected sequentially. The support component has a through groove that extends vertically through the support component, forming two sidewalls spaced apart horizontally. A crossbeam is fixed to the support component within the through groove. The crossbeam is connected to the two sidewalls by multiple first reinforcing ribs, and a triangular hollow is formed between adjacent first reinforcing ribs and their corresponding sidewalls and crossbeams. The two sidewalls, crossbeam, and first reinforcing ribs form a three-dimensional rigid frame. Through structural optimization, the self-weight is reduced; through the triangular support system, rigidity and deformation resistance are enhanced; and through stress dispersion, localized damage is avoided. Ultimately, the goal of "high rigidity, low stress, and lightweight" is achieved, improving the load-bearing capacity of the cantilever propeller with the same material usage.

Description

Technical Field

[0001] This utility model belongs to the field of cantilever propeller technology, and mainly relates to a high-rigidity, low-stress, lightweight silicon carbide cantilever propeller. Background Technology

[0002] Silicon carbide cantilever propellers play a crucial role in semiconductor and photovoltaic manufacturing. Reaction-bonded silicon carbide cantilever propellers possess characteristics such as high strength, high purity, high thermal conductivity, no porosity, resistance to acid and alkali corrosion, no pollution at high temperatures, no deformation, good thermal shock resistance, and large load capacity, ensuring precise wafer processing and maintaining stability under extreme conditions.

[0003] Limited by the production process, existing reaction-sintered silicon carbide cantilever propellers are mainly of the trough shape or improved shapes around the trough structure. The load-bearing area of ​​this trough-shaped cantilever propeller is prone to thermal deformation, bending and breakage in high-temperature environments, thus limiting its load-bearing capacity. Utility Model Content

[0004] This invention provides a high-rigidity, low-stress, and lightweight silicon carbide cantilever propeller to solve the problem of limited load-bearing capacity of existing cantilever propellers.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A high-rigidity, low-stress, lightweight silicon carbide cantilever propeller includes a fixing component, a transition component, and a carrier component connected in sequence. The carrier component has a through groove that extends vertically through the carrier component, so that the carrier component forms two side walls spaced apart in the left-right direction. A crossbeam located in the through groove is fixed on the carrier component. The crossbeam is connected to the two side walls by multiple first reinforcing ribs. A triangular hollow is formed between two adjacent first reinforcing ribs and the corresponding side walls and crossbeams.

[0007] It has the following beneficial effects: the two side walls, the crossbeam, and the first reinforcing rib form a three-dimensional rigid frame, reducing self-weight through structural optimization, enhancing stiffness and deformation resistance through the triangular support system, and avoiding local damage through stress dispersion, ultimately achieving the goal of "high stiffness, low stress, and lightweight", thus improving the load-bearing capacity of the cantilever propeller with the same amount of material; and the triangular hollow cantilever propeller is more conducive to temperature transfer, while reducing internal stress and improving thermal shock resistance.

[0008] Furthermore, a second reinforcing rib is fixed to one side of each of the two sidewalls opposite to the crossbeam, and the second reinforcing rib extends horizontally.

[0009] It has the following beneficial effects: when the cantilever propeller bears a vertically downward load, the sidewall will bend downward and the second stiffener extends horizontally, which is equivalent to forming a "horizontal support beam" on the outside of the sidewall. The horizontal stiffener and the sidewall form a "T-shaped section", which significantly increases the bending section modulus in the vertical direction.

[0010] Furthermore, both the crossbeam and the sidewall are perpendicular to the bottom of the load-bearing member.

[0011] Furthermore, the end of the fastener is provided with a plurality of first grooves, which are distributed in a circumferential array.

[0012] Furthermore, the thickness of the transition member gradually decreases from the fixing member to the bearing member.

[0013] Furthermore, the bottom of the transition piece is provided with a second groove.

[0014] It has the following beneficial effects: The second groove forms a hollow design at the bottom of the transition piece. Its strength enhancement mechanism is not through "adding material", but through structural topology optimization to achieve stress flow redistribution, thereby reducing weight while improving fatigue resistance and overall stiffness.

[0015] Furthermore, the second groove has a triangular structure.

[0016] It has the following beneficial effects: the triangular contour of the edge of the second groove can be regarded as an "invisible reinforcing rib". When the transition part is subjected to tensile load, the hypotenuse of the triangle generates "axial constraint" on the materials on both sides, which reduces tensile deformation. This "geometric self-reinforcing" does not require additional materials and achieves strength improvement only through shape design, which is in line with the "structural efficiency" principle of lightweight design. Attached Figure Description

[0017] Figure 1 This is a top view of the present invention;

[0018] Figure 2 This is a front view of the present invention;

[0019] Figure 3 This is a bottom view of the present invention;

[0020] Figure 4 This is a first-view structural schematic diagram of the present invention;

[0021] Figure 5 This is a structural schematic diagram of the present invention from a second perspective.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Fastener; 2. Transition component; 3. Bearing component; 4. Side wall; 5. Crossbeam; 6. First reinforcing rib; 7. Triangular cutout; 8. Second reinforcing rib; 9. Second groove; 10. First groove. Detailed Implementation

[0024] like Figures 1-3 As shown, a high-rigidity, low-stress, lightweight silicon carbide cantilever propeller includes a fixing member 1, a transition member 2, and a load-bearing member 3 connected sequentially. In this embodiment, the fixing member 1, the transition member 2, and the load-bearing member 3 are integrally formed. Figure 4 As shown, the end of the fastener 1 is provided with a plurality of first grooves 10, which are distributed in a circumferential array. This reduces the weight of the fastener 1 itself, but the strength of the fastener 1 itself is not reduced much.

[0025] like Figures 1-3 As shown, the support member 3 is a cuboid with a through groove running vertically through it, forming two sidewalls 4 spaced apart horizontally. The width of the through groove increases with distance from the transition member 2, thus reducing the weight of the support member 3 further away from the transition member 2 and allowing it to bear more weight. A crossbeam 5 is fixed to the support member 3 within the through groove, and both the crossbeam 5 and the sidewalls 4 are perpendicular to the bottom of the support member 3.

[0026] like Figure 1 , Figure 5 As shown, the crossbeam 5 is connected to the two side walls 4 by multiple first reinforcing ribs 6, and a triangular hollow 7 is formed between two adjacent first reinforcing ribs 6 and the corresponding side walls 4 and crossbeam 5.

[0027] The through-slot of the load-bearing component 3 runs vertically through it, dividing it into two side walls 4 spaced apart to the left and right. This design achieves weight reduction (reducing the additional load caused by its own weight) by removing material from non-load-bearing areas, while retaining the side walls 4 as the main load-bearing structure to avoid a decrease in stiffness due to material reduction.

[0028] The two side walls 4 form a symmetrical support structure, which is equivalent to transforming the single load-bearing component 3 into a "double beam structure". When the cantilever propeller is subjected to load, the two side walls 4 can jointly resist bending deformation, and the stiffness is significantly improved compared to a solid structure.

[0029] The crossbeam 5 inside the through groove is fixed between the two side walls 4, forming a lateral support and connecting the two side walls 4 into an integral frame. This design can prevent the side walls 4 from lateral displacement or torsion under load, and enhance the overall torsional stiffness.

[0030] Adjacent first reinforcing ribs 6, together with the sidewalls 4 and crossbeams 5, form a triangular perforation 7, utilizing the geometric stability of a triangle (its shape cannot change once the three sides are fixed). Under load, the triangular structure can distribute the load to each side, reducing stress concentration in individual components. For example, when the end of the cantilever propeller is under load, the triangular perforation 7 can convert the bending moment into axial tensile or compressive forces on each of the first reinforcing ribs 6, avoiding localized overload. The triangular perforation 7 design reduces material usage, but the triangular supporting structure maintains or even enhances strength through a "structure-for-material" approach. For example, under the same weight, the load-bearing capacity of a triangular truss structure is superior to that of a solid plate.

[0031] Traditional cantilever propellers with solid structures are prone to stress concentration at the root (where bending moment is greatest) under load, leading to material fatigue or fracture. In this design, the through-slot, crossbeam 5, and first reinforcing rib 6 form a porous frame structure. The load is distributed and transferred through the path of sidewall 4 → first reinforcing rib 6 → crossbeam 5, avoiding stress concentration in a certain area. For example, when the end is under load, the stress can be dispersed to the two sidewalls 4 and crossbeam 5 through multiple triangular openings 7, reducing local stress peaks.

[0032] The geometric characteristics of the triangular cutout 7 enable a uniform stress distribution in the structure under load. For example, under axial load, the sides of the triangle mainly bear tensile / compressive stress, rather than bending stress. Since the tensile / compressive strength of silicon carbide is much higher than its bending strength (the compressive strength of silicon carbide is about 2.5 GPa, and the bending strength is about 350 MPa), the material properties can be fully utilized, reducing the actual working stress.

[0033] The two side walls 4, the crossbeam 5, and the first reinforcing rib 6 form a three-dimensional rigid frame. By optimizing the structure, the self-weight is reduced (reducing the foundation load). The rigidity and deformation resistance are enhanced by the triangular support system. Local damage is avoided by stress dispersion. Ultimately, the goal of "high rigidity, low stress, and lightweight" is achieved, which improves the load-bearing capacity of the cantilever propeller with the same amount of material. Furthermore, the cantilever propeller with triangular hollow 7 is more conducive to temperature transfer, while reducing internal stress and improving thermal shock resistance.

[0034] Two sidewalls 4 are fixed with second reinforcing ribs 8 on the side opposite to the crossbeam 5. The second reinforcing ribs 8 extend horizontally, meaning that the plane containing the second reinforcing ribs 8 extends horizontally. When the cantilever propeller bears a vertically downward load (such as when placing an object), the sidewalls 4 will undergo downward bending deformation. The horizontal extension of the second reinforcing ribs 8 is equivalent to forming a "horizontal support beam" on the outside of the sidewalls 4. The second reinforcing ribs 8 and the sidewalls 4 form a "T-shaped section," which significantly increases the bending section modulus in the vertical direction.

[0035] The inner first reinforcing rib 6 and the crossbeam 5 form a triangular support (resisting bending and torsion), while the outer second reinforcing rib 8 provides vertical support, forming a three-dimensional support system of "inner triangle + outer horizontal". The inner and outer parts work together to resist vertical bending moment, thereby improving the overall bending stiffness.

[0036] If the load has a horizontal component (such as vibration or lateral thrust), sidewall 4 may experience lateral bending or torsion. The second stiffener 8 is horizontally fixed to the outside of sidewall 4, forming an anti-lateral displacement support. The second stiffener 8 connects to the corresponding sidewall 4, similar to a shear wall in a building, limiting the lateral displacement of sidewall 4. For example, when a horizontal force acts at the end, the second stiffener 8 can transfer the force to the fixed end, reducing the lateral deformation of sidewall 4. Simultaneously, it can suppress torsional vibration; the second stiffener 8 increases the structure's torsional moment of inertia, reduces the torsional amplitude of the cantilever propeller under dynamic loads, and improves stability.

[0037] Sidewall 4 may buckle locally under vertical load (similar to the bending of a thin plate under compression). The second stiffener 8 acts as a horizontal support, which can shorten the "effective buckling length" of sidewall 4 and effectively prevent thin-wall instability.

[0038] With the addition of the second reinforcing rib 8, the load can be directly transmitted horizontally through the bearing member 3 → side wall 4 → second reinforcing rib 8 → fixing member 1, shortening the transmission path and reducing stress loss in intermediate links. For example, when the end bears a vertical load, the second reinforcing rib 8 can share the load, reducing the load ratio between the first reinforcing rib 6 on the inner side of the side wall 4 and the crossbeam 5, thus avoiding local overload.

[0039] Traditional cantilever structures are prone to stress concentration at the root (where the fastener 1 connects). The addition of a second reinforcing rib 8 can disperse the stress at the root in the horizontal direction, reducing the risk of material fatigue fracture.

[0040] In this embodiment, the connection point between the second reinforcing rib 8 and the side wall 4 can be designed as a rounded transition (to avoid right-angle stress concentration), further reducing the local stress peak.

[0041] The through-slot design achieves lightweighting through "material removal," while the second reinforcing rib 8 enhances the rigidity of key components through "precise material addition." The combination of the two conforms to the principle of "equal strength design." For example, the outer side of the sidewall 4 is a high-stress area, and adding the second reinforcing rib 8 can improve the utilization rate of material strength in this area.

[0042] The thickness of the transition member 2 gradually decreases from the fixing member 1 to the bearing member 3, and the bottom of the transition member 2 is provided with a second groove 9 with a triangular structure. The newly added second groove 9 forms a hollow design at the bottom of the transition member 2. Its mechanism for enhancing strength is not through "adding material", but through structural topology optimization to achieve stress flow redistribution, thereby reducing weight while improving fatigue resistance and overall stiffness.

[0043] Transition piece 2 serves as the connection between fastener 1 and load-bearing piece 3. In traditional solid structures, stress concentration is easily caused at the bottom corner due to geometric abrupt changes. The second groove 9 is equivalent to opening an "unloading groove" at the bottom. The second groove 9 changes the load transmission path, so that the stress changes from "concentrating at the bottom edge" to "spreading evenly along both sides of the second groove 9".

[0044] The bottom center area of ​​transition piece 2 is usually a low-stress area under bending load. After the second groove 9 removes the material in this area, the remaining material can be closer to the "equal strength beam" design (i.e., the maximum stress of each section is similar).

[0045] A triangle is the only polygon with "shape invariance". When the three sides support each other, the external force will be evenly transmitted to the fulcrum through the three sides.

[0046] The symmetry of the second groove 9 in the triangle (isosceles triangle) increases the polar moment of inertia of the cross section and enhances the torsional stiffness. Under torsional load, the two sides of the second groove 9 in the triangle form "oblique torsional arms". The shear stress generated when the torque is transmitted through the oblique side is reduced due to the increase in torque.

[0047] The triangular outline at the edge of the second groove 9 can be considered as an "invisible reinforcing rib". When the transition piece 2 is subjected to tensile load, the hypotenuse of the triangle creates an "axial constraint" on the materials on both sides, similar to the diagonal members of a truss structure, thus reducing tensile deformation. This "geometric self-reinforcing" does not require additional materials; it achieves strength enhancement solely through shape design, conforming to the "structural efficiency" principle of lightweight design.

Claims

1. A high-rigidity low-stress lightweight silicon carbide cantilever paddle comprising a fixing member, a transition member, and a load bearing member connected together in order, characterized in that, The support member has a through groove that runs vertically through the support member, so that the support member forms two side walls spaced apart in the left and right directions. A crossbeam is fixed on the support member and located in the through groove. The crossbeam is connected to the two side walls by multiple first reinforcing ribs. A triangular hollow is formed between two adjacent first reinforcing ribs and the corresponding side walls and crossbeams.

2. The high stiffness, low stress, lightweight silicon carbide cantilever paddle of claim 1 wherein, A second reinforcing rib is fixed to one side of each of the two sidewalls opposite to the crossbeam, and the second reinforcing rib extends horizontally.

3. The high stiffness, low stress, lightweight silicon carbide cantilever paddle of claim 2, wherein, Both the crossbeam and the sidewall are perpendicular to the bottom of the load-bearing component.

4. The high stiffness, low stress, lightweight silicon carbide cantilever paddle of claim 3 wherein, The end of the fastener is provided with a plurality of first grooves, which are distributed in a circumferential array.

5. The high stiffness, low stress, lightweight silicon carbide cantilever paddle of any of claims 1-4, wherein, The thickness of the transition member gradually decreases from the fixing member to the bearing member.

6. The high stiffness, low stress, lightweight silicon carbide cantilever paddle of any of claims 1-4, wherein, The bottom of the transition piece is provided with a second groove.

7. The high stiffness, low stress, lightweight silicon carbide cantilever paddle of claim 6 wherein, The second groove has a triangular structure.

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