A heat field insulation structure composed of tungsten molybdenum and ceramic insulation materials

Abstract

The utility model relates to the field of thermal field heat preservation structure, relate to a thermal field heat preservation structure of tungsten molybdenum and ceramic heat preservation material quality composition, the utility model discloses upper heat preservation screen subassembly, middle heat preservation screen subassembly, lower heat preservation screen subassembly and gas guide cover subassembly, and upper heat preservation screen subassembly and middle heat preservation screen subassembly are connected through fixed bolt and are fixed in the upper furnace body through four groups of suspender bolt, and the bottom of middle heat preservation screen subassembly is fixed on the inner wall of upper furnace body through thermal field fixed crosspiece, and lower heat preservation screen subassembly is fixed on lower furnace body, gas guide cover subassembly includes molybdenum gas guide pipe, gas guide cover and molybdenum blocking piece, and molybdenum gas guide pipe and gas guide cover cover are tightly connected through gas guide cover fixing screw, and molybdenum blocking piece is arranged in the gap between the upper cover of gas guide cover and molybdenum gas guide pipe, and gas guide cover subassembly is arranged on upper heat preservation screen subassembly. Through gas guide cylinder fixing screw and gas guide cylinder fixed adapter sheet fastening on the upper heat preservation screen welding frame, multilayer heat preservation system can still effectively maintain thermal field temperature stability under 2000 DEG C high temperature environment.

Description

Technical Field

[0001] This utility model relates to the field of thermal insulation structure, and specifically to a thermal insulation structure composed of tungsten molybdenum and ceramic insulation materials. Background Technology

[0002] In the thermal field system of a high-pressure vacuum electric melting furnace, quartz products require extremely high cleanliness of the thermal environment. Traditional thermal field insulation structures often use a single material or a simple combination, making it difficult to simultaneously meet the requirements of cleanliness, high-temperature resistance, and thermal insulation performance. Conventional insulation felt materials are prone to shedding impurities, which can contaminate products and seriously affect product quality. While simple metal insulation screens can ensure cleanliness, their thermal insulation performance is insufficient and cannot meet the high-efficiency insulation requirements of high-temperature environments. In addition, the traditional fixing methods are relatively simple, which can easily lead to structural instability in a high-pressure vacuum environment, making it difficult to adapt to the complex working conditions of the electric melting furnace. Therefore, there is an urgent need for a thermal field insulation structure that combines high cleanliness, excellent thermal insulation performance, and a stable structure to solve the problems of high contamination risk, low insulation efficiency, and poor structural reliability in existing technologies. Utility Model Content

[0003] To address the problems of existing technologies, this utility model provides a thermal insulation structure composed of tungsten molybdenum and ceramic insulation materials.

[0004] The objective of this utility model can be achieved through the following technical solution: A thermal insulation structure composed of tungsten, molybdenum, and ceramic insulation materials, including an upper insulation screen assembly, a middle insulation screen assembly, a lower insulation screen assembly, and a gas guide hood assembly. The upper and middle insulation screen assemblies are connected by fixing bolts and fixed to the upper furnace body by four sets of hanging rod bolts. The bottom of the middle insulation screen assembly is fixed to the inner wall of the upper furnace body by a thermal field fixing bracket. The lower insulation screen assembly is fixed to the lower furnace body. The gas guide hood assembly includes a molybdenum gas guide pipe, a gas guide hood, and a molybdenum baffle plate. The molybdenum gas guide pipe and the gas guide hood are fastened together by gas guide hood fixing screws. The molybdenum baffle plate is disposed in the gap between the gas guide hood cover and the molybdenum gas guide pipe. The gas guide hood assembly is disposed on the upper insulation screen assembly and fastened to the upper insulation screen welding frame by gas guide cylinder fixing screws and a gas guide cylinder fixing adapter plate.

[0005] In a further improvement, the upper insulation screen assembly includes upper insulation screen tungsten screen and upper insulation screen molybdenum screen alternating from the inside to the outside. Each layer of upper insulation screen tungsten screen and upper insulation screen molybdenum screen is separated by upper insulation screen tungsten-molybdenum grid strips and fixed by upper insulation screen tungsten-molybdenum bolt group. The uppermost upper insulation screen molybdenum screen is provided with upper insulation screen ceramic insulation felt and upper insulation screen welding frame in sequence at the top.

[0006] In a further improvement, the intermediate insulation screen assembly includes intermediate insulation screen tungsten screen and intermediate insulation screen molybdenum screen alternating from the inside to the outside. Each layer of intermediate insulation screen tungsten screen and intermediate insulation screen molybdenum screen is separated by intermediate insulation screen tungsten-molybdenum grid strips and fixed by intermediate insulation screen tungsten-molybdenum bolt groups. The outermost intermediate insulation screen molybdenum screen is provided with intermediate insulation screen ceramic insulation felt and intermediate insulation screen welded frame in sequence on the outside.

[0007] In a further improvement, the lower insulation screen assembly includes alternating lower insulation screen tungsten screens and lower insulation screen molybdenum screens from the inside out. Each layer of lower insulation screen tungsten screens and lower insulation screen molybdenum screens is separated by lower insulation screen tungsten-molybdenum grid strips and fixed by lower insulation screen tungsten-molybdenum bolt groups. The lower end of the lower insulation screen molybdenum screen is provided with lower insulation screen ceramic insulation felt and lower insulation screen welded frame in sequence.

[0008] In a further improvement, the upper and lower insulation screen assemblies are provided with electrode holes and thermocouple holes containing boron nitride ceramic tubes.

[0009] In a further improvement, the air guide hood assembly is fastened to the upper insulation screen welding frame by air guide cylinder fixing screws and air guide cylinder fixing adapter plate.

[0010] Compared with existing technologies, the beneficial effects of the thermal insulation structure composed of tungsten-molybdenum and ceramic insulation materials of this utility model are as follows:

[0011] The inner tungsten-molybdenum metal screen is fully wrapped, combined with non-shedding ceramic insulation felt and an outer sealing frame. From material selection to structural design, this double protection ensures the cleanliness of the thermal field and prevents impurities from contaminating the quartz products. The tungsten-molybdenum metal screen blocks heat radiation, and the ceramic insulation felt reduces heat conduction, forming a multi-layer insulation system that can effectively maintain the stability of the thermal field temperature even in a high-temperature environment of 2000℃. The upper and lower components are fixed by a combination of bolt connection, suspension by multiple sets of hanging rod bolts, and inner wall fixing brackets, ensuring that the entire insulation structure remains reliably connected in a high-pressure vacuum environment. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the internal structure of the present invention.

[0013] Figure 2 This is a schematic diagram of the structure of the gas guide shroud assembly in this utility model.

[0014] In the diagram, 1-Upper insulation screen assembly, 11-Upper insulation screen tungsten screen, 12-Upper insulation screen molybdenum screen, 13-Upper insulation screen tungsten-molybdenum grid strip, 14-Upper insulation screen tungsten-molybdenum bolt assembly, 15-Upper insulation screen ceramic insulation felt, 16-Upper insulation screen welded frame, 2-Middle insulation screen assembly, 21-Middle insulation screen tungsten screen, 22-Middle insulation screen molybdenum screen, 23-Middle insulation screen tungsten-molybdenum grid strip, 24-Middle insulation screen tungsten-molybdenum bolt assembly, 25-Middle insulation screen ceramic insulation felt, 26-Middle insulation screen welded frame, 3-Lower insulation screen assembly. Insulation screen assembly, 31-lower insulation screen tungsten screen, 32-lower insulation screen molybdenum screen, 33-lower insulation screen tungsten-molybdenum grid strip, 34-lower insulation screen tungsten-molybdenum bolt assembly, 35-lower insulation screen ceramic insulation felt, 36-lower insulation screen welded frame, 5-hanging rod bolt, 6-thermal field fixing bracket, 7-boron nitride ceramic tube, 8-air guide hood assembly, 81-molybdenum air guide tube, 82-air guide hood, 83-molybdenum blocking plate, 84-air guide hood fixing screw, 85-air guide cylinder fixing screw, 86-air guide cylinder fixing adapter plate. Detailed Implementation

[0015] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; unless otherwise expressly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, they can refer to fixed connections or detachable connections, etc. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0016] The following describes the embodiments and appendices. Figures 1-2 The technical solution of this utility model will be further described below.

[0017] Example 1

[0018] A thermal insulation structure composed of tungsten, molybdenum, and ceramic insulation materials includes an upper insulation screen assembly 1, a middle insulation screen assembly 2, a lower insulation screen assembly 3, and a gas guide hood assembly 8. The upper insulation screen assembly 1 and the middle insulation screen assembly 2 are connected by fixing bolts and fixed to the upper furnace body by four sets of hanging rod bolts 5. The bottom of the middle insulation screen assembly 2 is fixed to the inner wall of the upper furnace body by a thermal field fixing bracket 6. The lower insulation screen assembly 3 is fixed to the lower furnace body. The gas guide hood assembly 8 includes a molybdenum gas guide pipe 81, a gas guide hood 82, and a molybdenum baffle plate 83. The molybdenum gas guide pipe 81 and the gas guide hood 82 are fastened together by gas guide hood fixing screws 84. The molybdenum baffle plate 83 is disposed in the gap between the upper cover of the gas guide hood 82 and the molybdenum gas guide pipe 81. The gas guide hood assembly 8 is disposed on the upper insulation screen assembly 1 and fastened to the upper insulation screen welding frame 16 by gas guide cylinder fixing screws 85 and gas guide cylinder fixing adapter plate 86.

[0019] like Figures 1-2 As shown, the working principle of this utility model is as follows: This thermal insulation structure adopts a layered combination design, which combines a high-purity tungsten-molybdenum metal screen with a ceramic insulation felt with excellent thermal insulation performance, and achieves the stability of the overall structure through a reasonable fixing method.

[0020] Specifically, the upper, middle, and lower insulation screen components form a continuous insulation system through fixing bolts and hanging bolts. The middle insulation screen component is connected to the inner wall of the furnace through a thermal field fixing bracket, and the lower insulation screen component moves with the furnace body.

[0021] The inner layers of the upper, middle, and lower insulation shield components are made of tungsten-molybdenum metal shields (tungsten and molybdenum shields are alternately set). The high temperature resistance, corrosion resistance, and non-pollution properties of tungsten-molybdenum materials ensure the cleanliness of the core area of ​​the thermal field. The middle layer uses specially treated ceramic insulation felt, which avoids the pollution problems of traditional insulation felt due to its non-shedding properties, while giving full play to the excellent insulation performance of ceramic materials. The outer layer is wrapped by an L-shaped welded frame to form a sealed structure, further isolating external impurities and withstanding temperatures up to 2000℃.

[0022] The gas guide hood assembly, through the cooperation of the molybdenum gas guide pipe and the gas guide hood, enables precise introduction of protective gas. Molybdenum baffles are placed in the gas guide gap to prevent gas leakage, ensuring that the required protective atmosphere is maintained inside the thermal zone, meeting the stringent gas environment requirements of the ingot casting process.

[0023] As a further preferred embodiment, the upper heat insulation screen assembly 1 includes upper heat insulation screen tungsten screen 11 and upper heat insulation screen molybdenum screen 12 alternating from the inside to the outside. Each layer of upper heat insulation screen tungsten screen 11 and upper heat insulation screen molybdenum screen 12 is separated by upper heat insulation screen tungsten-molybdenum grid strips 13 and fixed by upper heat insulation screen tungsten-molybdenum bolt group 14. The uppermost upper heat insulation screen molybdenum screen 12 is provided with upper heat insulation screen ceramic heat insulation felt 15 and upper heat insulation screen welding frame 16 in sequence at the upper end.

[0024] The upper insulation screen uses four layers of tungsten screens and five layers of molybdenum screens arranged alternately. Utilizing the high melting point of tungsten (3410℃) and the good high-temperature strength of molybdenum (melting point 2623℃), a gradient high-temperature resistant structure is formed. The inner tungsten screen directly withstands the high temperature, while the outer molybdenum screen provides auxiliary insulation, reducing heat loss. Tungsten-molybdenum grid strips are installed between each layer of metal screens, providing interlayer support to prevent the metal screens from sticking together or deforming due to thermal expansion and contraction; they also create air insulation gaps to further reduce heat conduction efficiency. Bolts are used to tighten and fix the multiple layers of metal screens, ensuring a tight bond and preventing interlayer displacement. A ceramic insulation felt is placed on the outer side of the uppermost molybdenum screen, utilizing its low thermal conductivity to block heat loss from the upper layers. An external L-shaped welded frame (made of 316L stainless steel) wraps around the ceramic felt, forming a rigid support structure. Welded sealing of the edges prevents ceramic felt fibers from spilling out and contaminating the thermal field.

[0025] As a further preferred embodiment, the intermediate insulation screen assembly 2 includes alternating layers of tungsten screen 21 and molybdenum screen 22 from the inside out. Each layer of tungsten screen 21 and molybdenum screen 22 is separated by tungsten-molybdenum grid strips 23 and fixed by tungsten-molybdenum bolt groups 24. The outermost molybdenum screen 22 is provided with ceramic insulation felt 25 and welded frame 26 in sequence. Consistent with the structure of the upper insulation screen, this ensures cleanliness and high-temperature resistance in the central part of the thermal zone. The increased thickness of the outer ceramic insulation felt enhances the insulation effect in the medium-temperature area, reducing heat loss to the furnace wall.

[0026] As a further preferred embodiment, the lower insulation screen assembly 3 includes alternating lower insulation screen tungsten screen 31 and lower insulation screen molybdenum screen 32 from the inside out. Each layer of lower insulation screen tungsten screen 31 and lower insulation screen molybdenum screen 32 is separated by lower insulation screen tungsten-molybdenum grid strips 33 and fixed by lower insulation screen tungsten-molybdenum bolt groups 34. The lower end of the lowest lower insulation screen molybdenum screen 32 is provided with lower insulation screen ceramic insulation felt 35 and lower insulation screen welded frame 36 in sequence. Consistent with the structure of the upper insulation screen, it ensures the cleanliness and high temperature resistance of the middle of the hot zone; the thickness of the outer ceramic insulation felt is increased to enhance the insulation effect in the medium temperature area and reduce heat loss to the furnace wall.

[0027] As a further preferred embodiment, the upper insulation screen assembly 1 and the lower insulation screen assembly 3 are internally provided with electrode holes and thermocouple holes containing boron nitride ceramic tubes 7. By placing boron nitride ceramic tubes within the electrode holes and thermocouple holes of the upper and lower insulation screens, their high temperature resistance (oxidation resistance up to 900℃, and 2800℃ in an inert atmosphere), high insulation (low dielectric constant), and chemical stability (does not react with molten metal) isolate the electrodes / thermocouples from direct contact with the metal screen.

[0028] In a further preferred embodiment, the air guide shroud assembly 8 is fastened to the upper insulation screen welding frame 16 by air guide cylinder fixing screws 85 and air guide cylinder fixing adapter plate 86. The air guide shroud assembly is connected to the upper insulation screen welding frame by the air guide cylinder fixing screws and adapter plate, enhancing vibration resistance. The molybdenum air guide tube and air guide shroud are fastened with screws for easy disassembly and maintenance, while the molybdenum baffle fills the gaps, utilizing the high-temperature ductility of molybdenum to ensure sealing performance.

[0029] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A hot zone insulation structure composed of tungsten molybdenum and ceramic insulation materials, characterized in that, The system includes an upper insulation screen assembly, a middle insulation screen assembly, a lower insulation screen assembly, and a gas guide hood assembly. The upper and middle insulation screen assemblies are connected by fixing bolts and fixed to the upper furnace body by four sets of hanging rod bolts. The bottom of the middle insulation screen assembly is fixed to the inner wall of the upper furnace body by a thermal field fixing bracket. The lower insulation screen assembly is fixed to the lower furnace body. The gas guide hood assembly includes a molybdenum gas guide pipe, a gas guide hood, and a molybdenum baffle plate. The molybdenum gas guide pipe and the gas guide hood are fastened together by gas guide hood fixing screws. The molybdenum baffle plate is disposed in the gap between the gas guide hood cover and the molybdenum gas guide pipe. The gas guide hood assembly is disposed on the upper insulation screen assembly and is fastened to the upper insulation screen welding frame by gas guide cylinder fixing screws and a gas guide cylinder fixing adapter plate.

2. The thermal insulation structure composed of tungsten molybdenum and ceramic insulation materials according to claim 1, characterized in that, The upper insulation screen assembly includes upper insulation screen tungsten screen and upper insulation screen molybdenum screen alternating from the inside to the outside. Each layer of upper insulation screen tungsten screen and upper insulation screen molybdenum screen is separated by upper insulation screen tungsten-molybdenum grid strips and fixed by upper insulation screen tungsten-molybdenum bolt group. The uppermost upper insulation screen molybdenum screen is provided with upper insulation screen ceramic insulation felt and upper insulation screen welding frame in sequence.

3. The thermal insulation structure composed of tungsten molybdenum and ceramic insulation materials according to claim 1, characterized in that, The intermediate heat insulation screen assembly includes alternating layers of tungsten and molybdenum intermediate heat insulation screens from the inside out. Each layer of tungsten and molybdenum intermediate heat insulation screens is separated by tungsten and molybdenum grid strips and fixed by tungsten and molybdenum bolt groups. The outermost molybdenum intermediate heat insulation screen is provided with ceramic insulation felt and welded frame in sequence on its outer side.

4. The thermal insulation structure composed of tungsten molybdenum and ceramic insulation materials according to claim 1, characterized in that, The lower insulation screen assembly includes alternating lower insulation screen tungsten screen and lower insulation screen molybdenum screen from the inside out. Each layer of lower insulation screen tungsten screen and lower insulation screen molybdenum screen is separated by lower insulation screen tungsten-molybdenum grid strips and fixed by lower insulation screen tungsten-molybdenum bolt groups. The lower end of the lower insulation screen molybdenum screen is provided with lower insulation screen ceramic insulation felt and lower insulation screen welded frame in sequence.

5. The thermal insulation structure composed of tungsten molybdenum and ceramic insulation materials according to claim 1, characterized in that, The upper and lower insulation screen assemblies are equipped with electrode holes and thermocouple holes containing boron nitride ceramic tubes.

6. The thermal insulation structure composed of tungsten molybdenum and ceramic insulation materials according to claim 1, characterized in that, The air guide hood assembly is fastened to the upper insulation screen welding frame by air guide cylinder fixing screws and air guide cylinder fixing adapter plate.

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