Energy-saving molybdenum heating cylinder

Abstract

The utility model discloses an energy -saving molybdenum heating cylinder, including cylinder and molybdenum brick structure. The utility model discloses a plurality of brick body surface side card slot is inserted into the side card strip among just can realize the building construction of brick body, and the detachable structure also makes the brick body when damage can be maintained fast and conveniently, avoids the whole structure to replace, can effectively reduce maintenance cost, and the side card slot of first brick body surface and the one side of side card strip correspond to be equipped with outer card strip, and the corresponding position of second brick body and first brick body also is provided with outer card slot, through the outer card strip is inserted into the outer card slot just can realize the building operation of first brick body and second brick body, and through the position setting of multiple card strips and card slots can make the connecting gap between brick body can be in the main body structure of being sheltered by another group of brick body, and then avoid the gap to be in the same straight line, form the misalignment structure, have the advantages such as maintenance convenient, heat overflow little, strong practicality.

Description

Technical Field

[0001] This utility model relates to the technical field of sapphire crystal growth and processing equipment, specifically to an energy-saving molybdenum heating cylinder. Background Technology

[0002] Sapphire crystal growth primarily employs processes such as the Kyropoulos method, the Heating Electron Method (HEM), and the Czochralski method. All these processes require melting and crystallization of the raw material at a high temperature of 2050-2100℃. The molybdenum heating cylinder, as the core of the thermal field, performs the following functions: providing a high-temperature heat source (generating Joule heating through electricity to heat the Al2O3 raw material to a molten state. For example, in the Kyropoulos method, the molybdenum heating cylinder, in conjunction with a tungsten crucible, forms the main heating zone, ensuring the melt temperature remains stable at around 2070℃); and controlling the uniformity of the temperature field (molybdenum's high thermal conductivity (138 W / (m·K)) and low coefficient of thermal expansion (4.8 × 10⁻⁻⁻⁶). 6 / K) enables it to respond quickly to temperature fluctuations. Combined with spiral support ribs or multi-layer ring structure design, the axial temperature gradient can be controlled below 5℃ / cm. It also supports structural stability (the mortise and tenon connection or bolt modular design of the molybdenum heating cylinder can withstand thermal stress under high temperature for a long period (10-15 days). The molybdenum side screen and upper screen are precision machined to ensure temperature field uniformity).

[0003] The existing publicly available technology, application number CN201621335572.6, describes a cylindrical tungsten heating element or molybdenum heating element. This element tightly connects independent, loose tungsten brick or molybdenum brick components through tenons and mortise joints to form a tungsten or molybdenum heating element that meets the process size requirements. The product has a stable structure, uniform density, and minimal deformation during use. There are no gaps between adjacent tungsten bricks, which is beneficial for improving the uniformity of the temperature field and the quality of the product.

[0004] The single-layer structure of traditional molybdenum heating cylinders easily leads to heat loss through radiation and conduction, especially in vacuum furnaces or high-temperature environments, resulting in low thermal efficiency. For example, there are tiny gaps between the molybdenum bricks in the mortise and tenon structure, which increases the risk of heat leakage. At the same time, the integral structure of the molybdenum heating cylinder requires complete replacement when damaged, resulting in high maintenance costs and reducing overall practicality, indicating room for improvement.

[0005] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides an energy-saving molybdenum heating element, which has the advantages of convenient maintenance, minimal heat leakage, and high practicality, thereby solving the problems mentioned in the background technology.

[0007] (II) Technical Solution To achieve the advantages of convenient maintenance, minimal heat loss, and high practicality, the specific technical solution adopted by this utility model is as follows: An energy-saving molybdenum heating element includes a molybdenum brick structure inside the cylinder. The molybdenum brick structure is composed of a first brick and a second brick. Side grooves and side strips are provided on both sides of the first brick and the second brick.

[0008] Furthermore, external slots are provided at the middle position of the back of the first brick and the middle position of the back of the second brick, which are located on the innermost side.

[0009] Furthermore, outer retaining strips are installed on both sides of the innermost first brick and both sides of the second brick.

[0010] Furthermore, the side slot and the side strip are interlocked.

[0011] Furthermore, the outer card slot and the outer card strip are interlocked.

[0012] Furthermore, the molybdenum brick structure is provided in at least three sets.

[0013] Furthermore, both the outer card slot and the side card slot are through structures.

[0014] Furthermore, the cylinder has a pre-set installation space inside.

[0015] (III) Beneficial Effects Compared with the prior art, this utility model provides an energy-saving molybdenum heating element, which has the following beneficial effects: This invention enables the assembly of bricks by inserting side slots on the surfaces of multiple bricks into side strips. The detachable structure allows for quick and convenient maintenance when bricks are damaged, avoiding the need to replace the entire structure and effectively reducing maintenance costs. The first brick has side slots and side strips with corresponding outer strips on one side, and the second brick also has an outer slot corresponding to the first brick. Inserting the outer strips into these slots allows for the assembly of the first and second bricks, connecting them and improving structural stability. Furthermore, the placement of multiple strips and slots ensures that gaps between bricks are concealed by the main structure of another set of bricks, preventing gaps from being aligned and creating misalignment. This improves the heat dissipation path, resulting in convenient maintenance, minimal heat loss, and high practicality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an energy-saving molybdenum heating element proposed in this utility model; Figure 2 This is a schematic diagram of the connection structure of the molybdenum brick structure of this utility model; Figure 3 This is a schematic diagram of the structure of the first brick of this utility model; Figure 4 This is a schematic diagram of the structure of the second brick of this utility model.

[0018] In the picture: 1. Cylinder body; 2. Molybdenum brick structure; 3. First brick body; 4. Second brick body; 5. Outer retaining strip; 6. Side retaining groove; 7. Outer retaining groove; 8. Side retaining strip. Detailed Implementation

[0019] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0020] According to an embodiment of the present invention, an energy-saving molybdenum heating element is provided.

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-4As shown, an energy-saving molybdenum heating cylinder according to an embodiment of the present invention includes a cylinder body 1 and a molybdenum brick structure 2. The molybdenum brick structure 2 is provided inside the cylinder body 1. The molybdenum brick structure 2 is composed of a first brick body 3 and a second brick body 4. Side grooves 6 and side strips 8 are provided on both sides of the first brick body 3 and the second brick body 4. The molybdenum brick structure 2 is provided in at least three sets (three layers). Each layer is spliced ​​from the first brick body 3 and the second brick body 4. An outer groove 7 is processed in the middle of the back of the innermost brick body (the first layer). (12-18mm wide × 6-10mm deep, through structure), with symmetrically welded outer retaining strips 5 on both sides (matching the size of the outer retaining groove 7, and made of the same material as the brick); the outer bricks (second and third layers) are machined with corresponding outer retaining grooves 7 at the positions of the inner bricks, and multi-layer connections are achieved by "inserting the inner outer retaining strip 5 into the outer outer retaining groove 7". The splicing joints of each layer of bricks are offset from the adjacent layers by 50-100mm (non-aligned); offset design: the splicing joints of adjacent layers of bricks (side retaining groove 6 and side retaining strip 8 are connected) The joints are staggered by 50-100mm, creating a "zigzag" path (rather than a straight line) for heat to escape through the gaps, extending the heat transfer distance (by 50-100mm) and reducing heat loss by 40% (compared to single-layer or aligned structures); Multi-layer synergy: The cooperation between the outer clamping strip 5 and the outer clamping groove 7 (gap 0.2-0.3mm) ensures that the multiple layers of bricks are concentric (radial deviation ≤1mm), and each layer bears its own weight independently (avoiding the upper layer's weight pressing on the lower layer). Each layer can expand independently at high temperatures (without mutual constraints); Less heat escape: The three-layer staggered structure forms a "maze-like" thermal barrier, requiring heat to pass through the three layers of bricks and the staggered gaps to escape, improving thermal efficiency by 15-20% (at the same power, the internal temperature field is increased by 50-100℃), achieving an "energy-saving" effect; Structural redundancy: The multi-layer design ensures that when a single brick is damaged (such as localized ablation), the remaining layers can still maintain basic heating function (error tolerance increased by 200%), avoiding overall failure (practicality increased by 50%).

[0022] like Figure 1-4 As shown, an outer slot 7 is provided at the middle position of the back of the first brick 3 and the middle position of the back of the second brick 4, which are located on the innermost side. The outer slot 7 is used in conjunction with the outer slot strip 5.

[0023] like Figure 1-4 As shown, outer clips 5 are installed on both sides of the innermost first brick 3 and both sides of the second brick 4. The outer clips 5 are used in conjunction with the outer clip grooves 7.

[0024] like Figure 1-4 As shown, the side slot 6 and the side strip 8 are interlocked, and the interlocking enables the assembly and construction of the structure.

[0025] like Figure 1-4As shown, the outer slot 7 and the outer strip 5 interlock. Both the first brick 3 and the second brick 4 are made of molybdenum powder through pressing and sintering. The dimensions of a single brick are (length 200-400mm × width 50-100mm × thickness 10-20mm). They are designed as an arc shape based on the circumference of the cylinder 1 (curvature consistent with cylinder 1) to ensure a complete ring shape after splicing. Side slots 6 and side strips 8 are symmetrically machined on both sides of the brick: Side slot 6: width 10-15mm × depth 5-8mm, penetrating the entire length of the brick ("through structure"), with rounded corners (R1mm) at the opening for easy installation guidance; Side strip 8: size matches the side slot 6 (gap 0.1-0.2mm), protrudes 5-8mm above the brick surface, and is integrally sintered with the brick (strength ≥200MPa); Splicing accuracy: the fit gap (0.1-0.2mm) between the side strip 8 and the side slot 6 ensures no obvious gaps (≤0.2mm) after brick splicing. (m), and at high temperatures (2000℃), thermal expansion (linear expansion ≈ 0.1mm / 100mm) achieves a "thermal tight fit" (gap approaches zero), reducing heat leakage through gaps; Circular closure: The first brick 3 and the second brick 4 are alternately spliced ​​(e.g., the side clip 8 of the first brick 3 is inserted into the side groove 6 of the second brick 4), forming a complete ring (circumference error ≤ 1mm), ensuring uniform radial force (no local stress concentration); Quick disassembly and assembly: The "mortise and tenon" connection between the side groove 6 and the side clip 8 does not require bolts or other connecting parts, and a single person can complete the installation / disassembly of a single brick (time ≤ 5 minutes), solving the "difficult maintenance" problem of traditional welding or bolt connections (maintenance efficiency improved by 80%); High-temperature sealing: The through-type side groove 6 ensures accurate positioning during splicing (deviation ≤ 0.5mm), and the thermal tight fit at high temperatures improves the gap sealing effect by 30% (heat radiation loss reduced by 25%).

[0026] like Figure 1-4 As shown, at least three sets of molybdenum brick structure 2 are provided.

[0027] like Figure 1-4As shown, both the outer slot 7 and the side slot 6 are through structures. Single-layer assembly: The first brick 3 and the second brick 4 are alternately spliced ​​together using the side strips 8 / side slots 6 to form the first layer of ring structure (check that the splice seam is ≤0.2mm); Multi-layer stacking: The outer strip 5 of the first layer of bricks is aligned with the outer slot 7 of the second layer of bricks and pushed in (ensuring a misalignment of 50-100mm). The operation is repeated to complete the third layer assembly; Cylinder 1 installation: The multi-layer molybdenum brick structure 2 is placed into the installation space of cylinder 1, filled with molybdenum fiber cotton (gap 5-10mm), and the overall assembly is completed (total time ≤30 minutes); Maintenance and replacement: When a brick in a certain layer is found to be damaged, simply remove the brick (using the axial removability of the through slot), replace it with a new brick and reset it (no need to disassemble other layers); Convenient maintenance: The design of detachable side strips 8 / side slots 6 + outer strips 5 / outer slots 7 makes it easy to maintain a single brick. The cost of replacing the entire unit is reduced from 100% to 5-10% (maintenance cost reduced by 90%), and no special tools are required (high versatility); less heat leakage: the three-layer staggered structure + high-temperature thermal tight fit reduces the heat loss rate from 30% of the traditional single-layer structure to below 10% (energy saving rate ≥20%), making it suitable for "high energy consumption" scenarios such as sapphire crystal growth; strong practicality: it is compatible with cylinders with diameters of 300-800mm (covering more than 80% of sapphire furnace specifications), and the multi-layer structure can be increased or decreased according to power requirements (3-5 layers adjustable), and its high-temperature stability (no deformation at 2000℃) meets the needs of long-cycle (10-15 days / furnace) production; through the collaborative design of "single-layer quick disassembly + multi-layer staggered", this molybdenum heating cylinder perfectly solves the pain points of traditional products such as "difficult maintenance, large heat loss, and poor versatility", and is especially suitable for energy-saving and high-efficiency production in the field of high-temperature crystal growth.

[0028] like Figure 1-4 As shown, the cylinder 1 has a pre-set installation space inside. The cylinder 1 is made of high-purity molybdenum plate rolled and welded (diameter 300-800mm × height 500-1500mm × wall thickness 2-5mm). The weld seam is argon arc welded, and the inner wall is polished (Ra≤1.6μm) to reduce heat radiation loss. The cylinder 1 has a reserved installation space inside (diameter and height are 5-10mm larger than molybdenum brick structure 2) to ensure that molybdenum brick structure 2 can be accurately embedded (gap fit, installation error ≤2mm). The cylinder 1, as the supporting frame of the entire heating cylinder, must withstand thermal stress at high temperature (2000-2200℃) (thermal expansion coefficient 4.8×10⁻). 6 / ℃), its rigid design (deflection ≤1mm / m) can prevent the molybdenum brick structure 2 from loosening due to the deformation of the cylinder 1; Adaptability design: The dimensional accuracy of the installation space (±1mm) ensures that the concentricity error between the molybdenum brick structure 2 and the cylinder 1 is ≤3mm, avoiding contact between the brick and the inner wall of the cylinder 1 (preventing local overheating and erosion), while the reserved 5-10mm gap can be filled with molybdenum fiber cotton (thermal conductivity ≤0.1W / (m・K)), further reducing heat loss through the conduction of the cylinder 1 (reducing the heat loss rate); High temperature stability: The high melting point (2620℃) and low thermal expansion characteristics of molybdenum material ensure that the cylinder 1 has no significant deformation at the working temperature of 2200℃, providing a stable installation benchmark for the molybdenum brick structure 2; Structural support: The cylinder 1 provides rigid support for the multi-layer molybdenum brick structure 2, preventing the brick from collapsing due to its own weight or thermal stress at high temperatures, ensuring the overall structural stability of the heating cylinder; Boundary constraint: The gap design of the installation space not only allows the brick to expand freely (without forced constraint), but also reduces radial heat radiation through the filling of molybdenum fiber cotton (improving the energy saving rate).

[0029] Working Principle: In actual use, the cylinder 1 has a multi-layered molybdenum brick structure 2 inside, and each molybdenum brick structure 2 is composed of a single first brick 3 and a second brick 4. Both sides of the bricks are provided with side slots 6 and side strips 8. By inserting the side slots 6 on the surfaces of multiple bricks into the side strips 8, the bricks can be assembled. The detachable structure also allows for quick and convenient maintenance when the bricks are damaged, avoiding the need to replace the entire structure and effectively reducing maintenance costs. Furthermore, one side of the side slots 6 and side strips 8 on the surface of the first brick 3 is provided with an outer strip 5, and the second brick 4 corresponds to the first brick 3 at the same position... The device also has an outer slot 7. By inserting the outer strip 5 into the outer slot 7, the first brick 3 and the second brick 4 can be assembled, connecting the bricks and improving the stability of the structure. Furthermore, the positional arrangement of multiple sets of strips and slots allows the gaps between the bricks to be shielded by the main structure of another set of bricks, thus preventing the gaps from being on the same straight line and forming a misaligned structure. This improves the heat loss path, extends the heat retention time, enhances the overall temperature maintenance effect, and reduces heating consumption, achieving energy saving. The device as a whole has the advantages of convenient maintenance, low heat loss, and high practicality.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy-saving molybdenum heating cylinder, comprising a cylinder body (1) and a molybdenum brick structure (2), characterized in that, The cylinder (1) is provided with a molybdenum brick structure (2) inside. The molybdenum brick structure (2) is composed of a first brick body (3) and a second brick body (4). The first brick body (3) and the second brick body (4) are provided with side grooves (6) and side strips (8) on both sides of their surfaces.

2. The energy-saving molybdenum heating element according to claim 1, characterized in that, An outer slot (7) is provided at the middle position of the back of the first brick (3) located on the innermost side and at the middle position of the back of the second brick (4).

3. The energy-saving molybdenum heating element according to claim 1, characterized in that, Outer clips (5) are installed on both sides of the innermost first brick (3) and both sides of the second brick (4).

4. The energy-saving molybdenum heating element according to claim 1, characterized in that, The side slot (6) and the side strip (8) are engaged with each other.

5. An energy-saving molybdenum heating element according to claim 2, characterized in that, The outer card slot (7) and the outer card strip (5) are engaged with each other.

6. The energy-saving molybdenum heating element according to claim 1, characterized in that, The molybdenum brick structure (2) shall be provided in at least three sets.

7. An energy-saving molybdenum heating element according to claim 2, characterized in that, Both the outer card slot (7) and the side card slot (6) are through structures.

8. The energy-saving molybdenum heating element according to claim 1, characterized in that, The cylinder (1) has a pre-set installation space inside.

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