High-efficiency ultrahigh-temperature confocal ellipsoid heating furnace

Abstract

The high-efficiency ultrahigh-temperature confocal ellipsoid heating furnace comprises a hearth with an ellipsoid cavity and a halogen lamp body located in the ellipsoid cavity, a sample containing frame is connected into the hearth, the ratio of the long axis to the short axis of the ellipsoid cavity of the hearth is 1.10-1.35, the hearth is made of heat-resisting aluminum alloy, and a cooling water channel is formed in the side of the hearth. A traditional slender ellipsoid hearth is changed into a fat ball hearth, heat losses at the two ends of the hearth are reduced, meanwhile, heat-resisting alloy is selected, a furnace body cooling water tank is changed into a cooling water channel, dead zones are reduced, it is avoided that the local temperature of the hearth surface rises and becomes rough, and consequently the infrared reflectivity is reduced, and the service life of the hearth is prolonged; the hearth is kept to have the highest infrared reflectivity, and the utilization rate of infrared rays is increased. On the basis of not changing the heating capacity of the halogen lamp, the heat utilization rate in the heating furnace is further improved, the maintenance frequency of the halogen lamp or the hearth is reduced, and the equipment stability and economic benefits are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-high temperature confocal heating furnaces, and specifically relates to a high-efficiency ultra-high temperature confocal ellipsoidal heating furnace. Background Technique

[0002] The ultra-high temperature confocal heating furnace is a new type of high-efficiency and non-contact heating furnace. An infrared heating halogen lamp is placed at one focus of the ellipsoidal furnace chamber, and a cylindrical high-temperature isothermal zone can be focused at the other focus. The maximum heating temperature can reach about 1650 °C. By injecting ultra-high pressure pure He gas, the maximum heating rate can reach 1200 K / min, and the cooling rate exceeds 3000 K / min. It has gradually attracted attention in the field of high-temperature metallurgical detection and is mainly used for in-situ observation experiments of the melting, solidification, phase transformation, and crystallization processes of metallurgical slag or metal materials at high temperatures.

[0003] The heat source of the high-temperature confocal heating furnace is a halogen lamp installed at the focus of the lower half of the ellipsoidal furnace chamber. Since gold has an extremely low absorption rate and can reflect the energy emitted by the halogen lamp to the greatest extent, a layer of gold is plated on the inner wall of the furnace chamber. The sample is placed in a crucible on a bracket at the focus of the upper half of the furnace chamber. Through the radiant heating of the gold-plated ellipsoidal infrared heating furnace, during the heating process, the thermal energy of the halogen lamp is transferred to the chamber wall, crucible, and sample through reflection, and then the cooling rate is regulated by water, air, or flowing inert gas. The thermocouple is spot-welded to the platinum corundum support rod bracket for precise temperature control and monitoring. When the target temperature is reached, the sample can be cooled to the required temperature at the set cooling rate. At the same time, through the observation port at the top of the furnace chamber, in-situ high-resolution video images of the sample can be collected during non-isothermal or isothermal cooling processes.

[0004] However, during use, when the halogen lamp filament is slightly deformed, it will cause a deviation from one focus inside the furnace chamber, resulting in the light being unable to effectively converge on the other focus, making it difficult to raise the heating temperature to 1600 °C. To achieve performance detection at the steelmaking temperature of 1600 °C, personnel often need to replace the halogen lamp at this time. And because the halogen lamp is in the furnace chamber, the overall disassembly and replacement operation is rather cumbersome and inconvenient, causing great inconvenience to the personnel. Therefore, there is an urgent need to improve the heating capacity of the heating furnace, that is, to raise the maximum heating temperature of the heating furnace to above 1600 °C, so that even if the halogen lamp filament is deformed, it can be easily heated to 1600 °C. On the one hand, the rated heating power of the halogen lamp can be increased. On the other hand, the heat utilization rate inside the heating furnace can be improved. There is currently no relevant technical report.

[0005] At present, the heating capacity of the confocal heating furnace needs to be improved. Without changing the heating capacity of the halogen lamp, it is necessary to further improve the heat utilization rate in the heating furnace. Since the two ends of the ellipsoidal heating furnace chamber are open, the top opening is an observation port for in-situ observation, and the bottom opening is for placing the halogen lamp into the furnace chamber. The infrared rays emitted by the halogen lamp will pass through the openings and radiate out of the furnace chamber, reducing the utilization rate of the heating amount of the halogen lamp. At present, the aperture of the openings at both ends of the confocal ellipsoidal furnace chamber at home and abroad has been reduced to the minimum. In order to improve the utilization rate of the heating amount of the halogen lamp, research and development need to be carried out from other angles. At present, the surface of the ellipsoidal furnace chamber is usually coated with a layer of gold element, which can reflect most of the infrared rays emitted by the halogen lamp to the other focus of the furnace chamber. However, the furnace chamber will still absorb part of the infrared rays and be heated and raised in temperature, resulting in deformation or recrystallization coarsening of the furnace body material, an increase in the surface roughness of the furnace chamber, a decrease in its ability to reflect infrared rays, and a decrease in the heat utilization rate in the heating furnace. Summary of the Invention

[0006] The purpose of the present invention is to provide a high-efficiency ultra-high temperature confocal ellipsoidal heating furnace, which has the advantage of improving the heat utilization rate.

[0007] To achieve the above purpose, the present invention provides the following technical solutions: A high-efficiency ultra-high temperature confocal ellipsoidal heating furnace, including a furnace chamber with an ellipsoidal chamber and a halogen lamp body located in the ellipsoidal chamber. A sample placement rack is connected inside the furnace chamber. The ratio of the major axis to the minor axis of the ellipsoidal chamber of the furnace chamber is 1.10 - 1.35. The material of the furnace chamber is selected as heat-resistant aluminum alloy, and a cooling water channel is formed on the side of the furnace chamber; it also includes an air outlet pipe and an air inlet pipe communicated with the furnace chamber. The air outlet pipe is located on the upper side and the air inlet pipe is located on the lower side; it also includes two water pipes communicated with the cooling water channel.

[0008] As a preferred solution, the ratio of the major axis to the minor axis of the ellipsoidal chamber in the furnace chamber is controlled within 1.10 - 1.35. To balance the distance between the halogen lamp body and the sample placement rack, the ratio of the major axis to the minor axis should be controlled within 1.15 - 1.25.

[0009] As a preferred solution, the material of the furnace chamber is specifically 2A16 of the Al-Cu-Mn system or 2A02 of the Al-Cu-Mg system. The heat-resistant aluminum alloy can ensure that the furnace wall remains smooth after being heated.

[0010] As a preferred solution, the diameter of the cooling water channel is 8 - 12 mm, to avoid the occurrence of dead zones during cooling, resulting in a relatively high local temperature of the furnace chamber and rough heating.

[0011] As a preferred solution, the cooling water channel is divided into 2 - 3 layers of water circuits, and the adjacent water circuits are connected end to end.

[0012] As a preferred solution, the connection between the intake pipe and the furnace chamber is arranged to slope upwards, so that after the gas enters the inner cavity of the furnace chamber, it can be reflected onto the focus of the ellipsoidal furnace chamber where the sample is placed, preventing the intake pipe from directly aiming at this focus and blowing off the sample. When cooling gas is introduced, the gas design of entering from the top and exiting from the bottom can ensure that the cooling gas quickly contacts the sample for cooling.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] Photons emitted from the halogen lamp at the same moment are all on the same spherical surface before reaching the furnace chamber wall. To reduce the loss of photons through the openings at both ends of the furnace chamber, it is necessary to reduce the proportion of the opening area to the area of this spherical surface. When the opening area cannot be changed, the area of this spherical surface can be increased, that is, the distance from the halogen lamp to the opening can be increased, moving the ellipsoidal focus towards the interior of the ellipsoid and reducing the ratio of the major axis to the minor axis. Currently, the ratio of the major axis to the minor axis of confocal ellipsoidal furnace chambers at home and abroad is approximately 10:7 = 1.39. When the present invention designs through simulation calculations to reduce the ratio of the major axis to the minor axis of the ellipsoidal furnace chamber to 1.09, the utilization rate of infrared rays is increased by 1.5 times. However, to balance the ellipsoidal spacing, that is, the distance between the halogen lamp and the sample test point, the ratio of the major axis to the minor axis should be controlled between 1.10 - 1.35 to more efficiently utilize the infrared rays released by the halogen lamp.

[0015] The cooling method of the ellipsoidal furnace body of the present invention avoids the occurrence of dead zones in the cooling water tank, resulting in relatively high local temperatures in the furnace chamber and the surface of the furnace chamber becoming rough due to heat.

[0016] The air inlet slopes upwards, causing the gas to be reflected onto the focus of the ellipsoidal furnace chamber where the sample is placed after hitting the upper furnace body, preventing the air inlet from directly aiming at this focus and blowing off the sample. When cooling gas is introduced, the gas design of entering from the top and exiting from the bottom can ensure that the cooling gas quickly contacts the sample for cooling. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 is a schematic front sectional view of the furnace body of the present invention;

[0019] Figure 3 is a schematic view of the mobile box structure of the present invention;

[0020] Figure 4 is a schematic front partial sectional view of the mobile box of the present invention;

[0021] Figure 5 is a schematic right sectional view of the mobile box of the present invention;

[0022] Figure 6 is the present invention Figure 2 partial enlarged view at A in;

[0023] Figure 7 is the incident light flux on the inner surface of the furnace chamber of the present invention;

[0024] Figure 8 is the incident light flux on the XY plane at the focal point of the present invention;

[0025] Figure 9 is the incident light flux on the 30×48 mm2 YZ central plane of the non-opening furnace chamber of the present invention;

[0026] Figure 10 is the incident light flux on the 30×48 mm2 YZ central plane of the opening furnace chamber of the present invention;

[0027] Figure 11 is the incident light flux on the 30×48 mm2 YZ central plane after adding metal blocks to the furnace chamber of the present invention;

[0028] Figure 12 is the light flux on the inner surface of the furnace chamber where the metal blocks are located at both ends without openings of the present invention;

[0029] Figure 13 is the incident light flux on the inner surface of the fat spherical furnace chamber of the present invention;

[0030] Figure 14 is the incident light flux on the XY plane at the focal point of the fat spherical furnace chamber of the present invention;

[0031] Figure 15 is the incident light flux on the 30×48 mm2 YZ central plane of the non-opening fat spherical furnace chamber of the present invention;

[0032] Figure 16 is the incident light flux on the 30×48 mm2 YZ central plane of the opening fat spherical furnace chamber of the present invention;

[0033] Figure 17 is the incident light flux on the 30×48 mm2 YZ central plane after adding metal blocks to the fat spherical furnace chamber of the present invention;

[0034] Figure 18 is the light flux on the inner surface of the fat spherical furnace chamber where the metal blocks are located at both ends without openings of the present invention.

[0035] In the figure: 1. Furnace body; 2. Base; 3. Support stud; 4. Support frame; 5. Support bottom plate; 6. Support frame; 7. Fixed frame; 8. Adjusting bolt; 9. Adjusting rod; 10. High-definition camera; 11. Torsion spring; 12. Observation port; 13. Sample placement rack; 14. Furnace cover; 15. Halogen lamp body; 16. Guide cross bar; 17. Protection baffle; 18. Metal sealing ring; 19. L-shaped moving rod; 20. Driving motor; 21. Moving box; 22. Metal sealing gasket; 23. Furnace chamber body; 24. Limit slide bar; 25. Fixed rod; 26. Support spring; 27. T-shaped moving plate; 28. Lifting plate; 29. Connecting rod; 30. U-shaped rotating rod; 31. Guide vertical rod; 32. Support shaft; 33. Limit rod; 34. Rotating cylinder; 35. Contact plate; 36. T-shaped guide rod; 37. Arc-shaped guide groove; 38. Adjusting screw. Specific implementation mode

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation mode of the present invention. The "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0038] Embodiment 1:

[0039] Please refer to Figures 1 - 6As shown in the figure, the present invention provides a high-performance ultra-high temperature confocal ellipsoidal heating furnace. The furnace chamber is composed of a furnace body 1 and a furnace chamber body 23. The furnace chamber body 23 is fixedly installed at the upper end of the inner cavity of the furnace body 1. A sample placement rack 13 is fixedly connected to the upper end of the right side of the inner cavity of the furnace chamber body 23. The ratio of the major axis to the minor axis of the ellipsoidal chamber in the furnace chamber body 23 is controlled within 1.10 - 1.35. The material of the furnace chamber body 23 is selected as heat-resistant aluminum alloy. A cooling water channel is provided between the upper end of the inner cavity of the furnace body 1 and the outer surface of the furnace chamber body 23. An air outlet pipe is fixedly connected to the upper end of the right side of the furnace body 1, and an air inlet pipe is fixedly connected to the lower end of the right side of the furnace body 1. A water guide pipe is fixedly connected to the upper end of the front surface of the furnace body 1, and the number of water guide pipes is two. The ratio of the major axis to the minor axis of the ellipsoidal chamber in the furnace chamber body 23 is controlled within 1.10 - 1.35. To balance the distance between the halogen lamp body 15 and the sample placement rack 13, the ratio of the major axis to the minor axis should be controlled within 1.15 - 1.25. The material of the furnace chamber body 23 is selected as heat-resistant aluminum alloy, specifically 2A16 of the Al-Cu-Mn system or 2A02 of the Al-Cu-Mg system. The heat-resistant aluminum alloy can ensure that the furnace wall surface remains smooth after the furnace chamber body 23 is heated. The diameter of the cooling water channel is 8 - 12 mm, avoiding the occurrence of dead zones during cooling, which may cause the local temperature of the furnace chamber body 23 to be relatively high and the surface to become rough due to heat. The cooling water channel is divided into 2 - 3 layers of water paths, and the adjacent water paths are connected end to end. The connection between the air inlet pipe and the furnace body 1 is arranged to slope upward, so that the gas can be reflected to the focus of the ellipsoidal furnace chamber for placing the sample after entering the inner cavity of the furnace chamber body 23, avoiding the air inlet pipe directly aiming at the focus and blowing off the sample. When cooling gas is introduced, the gas design of upper outlet and lower inlet can ensure that the cooling gas quickly contacts the sample for cooling.

[0040] In this technical solution, the photons emitted from the halogen lamp body 15 at the same moment are all on the same spherical surface before reaching the inner wall of the ellipsoidal chamber of the furnace chamber body 23. To reduce the photons lost through the openings at both ends of the furnace chamber body 23, it is necessary to reduce the proportion of the opening area in the area of this spherical surface. When the opening area cannot be changed, the area of the ellipsoidal chamber can be increased, that is, the distance between the halogen lamp body 15 and the opening can be increased, the ellipsoidal focus can be moved towards the interior of the ellipsoid, and the ratio of the major axis to the minor axis can be reduced. Through simulation calculation and design, when the ratio of the major axis to the minor axis of the ellipsoidal chamber of the furnace chamber body 23 is reduced to 1.09 in the present invention, the utilization rate of infrared rays is increased by 1.5 times. However, to balance the ellipsoidal spacing, that is, the distance between the halogen lamp body 15 and the sample test point, the ratio of the major axis to the minor axis should be controlled within 1.10 - 1.35 to more efficiently utilize the infrared rays released by the halogen lamp body 15.

[0041] Example Two:

[0042] Based on Example One, the present invention is as Figures 1 - 6As shown in the figure, a base 2 is fixedly connected to the bottom of the outer surface of the furnace body 1. The lower end of the left side of the outer surface of the furnace body 1 is movably connected with a protective baffle 17. Both ends of the right side of the protective baffle 17 are fixedly connected with fixed rods 25. A moving box 21 is fixedly connected between the right sides of the two fixed rods 25. The lower end of the left side of the moving box 21 is movably connected with a rotating cylinder 34 through a bearing. The right side of the outer surface of the rotating cylinder 34 is fixedly connected with a U-shaped rotating rod 30. The middle end of the top of the U-shaped rotating rod 30 is movably connected with a connecting rod 29 through a bearing. The upper end of the connecting rod 29 is movably connected with a lifting plate 28 through a bearing. The middle end of the top of the lifting plate 28 is fixedly installed at the bottom of the halogen lamp body 15. A torsion spring 11 is fixedly connected between the outer surface of the rotating cylinder 34 and the lower end of the left inner cavity of the moving box 21. Arc-shaped guide grooves 37 are opened at both ends of the inner cavity of the rotating cylinder 34. A T-shaped guide rod 36 is movably connected between the right ends of the two arc-shaped guide grooves 37. A contact plate 35 is fixedly connected to the left side of the T-shaped guide rod 36. A driving motor 20 is fixedly installed at the middle end of the inner cavity bottom of the base 2. The output end of the driving motor 20 is fixedly installed with an adjusting screw 38. The left side of the adjusting screw 38 is movably connected to the left side of the inner cavity of the base 2 through a bearing. The right end of the adjusting screw 38 is threadedly connected with an L-shaped moving rod 19. The left end of the top of the L-shaped moving rod 19 is movably connected to the lower end of the protective baffle 17. The right side of the L-shaped moving rod 19 is fixedly connected with a T-shaped moving plate 27. The lower end of the right side of the T-shaped moving plate 27 is movably connected to the lower end of the left side of the contact plate 35. A support spring 26 is fixedly connected between the upper end of the left side of the T-shaped moving plate 27 and the upper end of the right side of the protective baffle 17. The number of the support springs 26 is two.

[0043] In this technical solution, through the setting of the sample placement rack 13, the crucible required for supporting the sample can be supported inside the furnace body 1 and the furnace chamber body 23. And through the setting of the halogen lamp body 15, infrared rays can be generated during the experiment and converge on the surface of the sample inside the crucible after being reflected by the inner cavity of the furnace chamber body 23, so that the temperature of the sample surface can be rapidly increased, facilitating the personnel to conduct an effective heating experiment on the sample. At the same time, by optimizing the dimensions between the major axis and the minor axis inside the furnace chamber body 23, the light condensing efficiency of the furnace chamber body is effectively improved. And through the setting of the driving motor 20, the adjusting screw 38, the L-shaped moving rod 19, the T-shaped moving plate 27, the support spring 26, the contact plate 35, the torsion spring 11, the rotating cylinder 34, the U-shaped rotating rod 30, the arc-shaped guide groove 37, the T-shaped guide rod 36, the connecting rod 29, the lifting plate 28 and the moving box 21, during the process of replacing the damaged halogen lamp body 15, the halogen lamp body 15 can be quickly taken out from the inside of the elliptical furnace chamber 23 and the furnace body 1. The overall operation is convenient and fast, effectively improving the efficiency of the personnel's maintenance and replacement operations and facilitating the personnel to use.

[0044] Embodiment Three:

[0045] Based on the second embodiment, the present invention is as follows Figure 1 As shown, a support base plate 5 is fixedly connected to the bottom of the outer surface of the base 2. The left end of the top of the support base plate 5 is fixedly connected to a support frame 6. The upper end on the right side of the support frame 6 is fixedly connected to a fixing frame 7. A regulating bolt 8 is threadedly connected to the right end of the top of the fixing frame 7. An adjusting rod 9 is movably connected to the inner cavity of the fixing frame 7. A high-definition camera 10 is fixedly installed on the right side of the adjusting rod 9. Support frames 4 are fixedly connected to the four peripheries of the bottom of the support base plate 5. A support stud 3 is threadedly connected to the middle end of the bottom of the support frame 4. The bottom of the support stud 3 is fixedly connected to an anti-slip bottom plate.

[0046] In this technical solution, through the settings of the support base plate 5, the support frame 6, the fixing frame 7, the adjusting rod 9 and the adjusting bolt 8, the high-definition camera 10 can be effectively erected, so that personnel can use the high-definition camera 10 to take high-definition pictures of the heating state inside the furnace body 1, bringing great convenience to the test observation work of personnel. Through the settings of the support frame 4, the support stud 3 and the protection bottom plate, while effectively supporting the four peripheries of the bottom of the support base plate 5, it is convenient for personnel to adjust the support height at the corresponding position when the support base plate 5 is not placed stably, improving the overall placement stability.

[0047] Embodiment Four:

[0048] Based on the second embodiment, the present invention is as follows Figures 1 - 6 As shown, a furnace cover 14 is fixedly installed on the top of the furnace body 1 through bolts. The top of the furnace chamber body 23 is movably connected to the bottom of the furnace cover 14. An observation port 12 is opened in the middle end of the furnace cover 14. A high-temperature resistant glass plate is fixedly connected to the surface of the observation port 12. A metal sealing ring 18 is fixedly connected to the lower end of the protection baffle 17. The surface of the L-shaped moving rod 19 is movably connected to the surface of the metal sealing ring 18. A metal sealing gasket 22 is fixedly connected to the right side of the protection baffle 17. The right side of the metal sealing gasket 22 is movably connected to the lower end on the left side of the outer surface of the furnace body 1. The left end of the top of the base 2 is fixedly connected to a guiding cross bar 16. The lower end on the left side of the L-shaped moving rod 19 is movably connected to the right end of the guiding cross bar 16. A limiting sliding rod 24 is fixedly connected between the middle end on the right side of the protection baffle 17 and the middle end on the left side of the outer surface of the moving box 21. The middle end of the T-shaped moving plate 27 is movably connected to the surface of the limiting sliding rod 24. A limiting rod 33 is fixedly connected to the lower end on the right side of the contact plate 35. The number of the limiting rods 33 is two. The surface of the limiting rods 33 is movably connected to the lower end on the left side of the moving box 21. Guide vertical rods 31 are fixedly connected to both ends of the bottom of the inner cavity of the moving box 21. The surface of the lifting plate 28 is movably connected to the surface of the guide vertical rods 31. The lower end on the right side of the inner cavity of the moving box 21 is rotatably connected to a support shaft 32 through a bearing. The left side of the support shaft 32 is fixedly connected to the lower end on the right side of the U-shaped rotating rod 30.

[0049] In this technical solution, through the settings of the furnace cover 14, the observation port 12, and the high-temperature resistant glass plate, while protecting the top of the furnace body 1 and the furnace chamber body 23, it is convenient for personnel to observe the internal heating state. Through the settings of the metal sealing ring 18 and the metal gasket 22, the sealing performance of the contact between the L-shaped moving rod 19 and the protective baffle 17, and between the protective baffle 17 and the furnace body 1 is effectively improved respectively. Through the setting of the guiding cross bar 16, the purpose of guiding the L-shaped moving rod 19 is achieved, avoiding the left end of the L-shaped moving rod 19 from tilting due to force during movement. Through the setting of the limiting slide rod 24, the purpose of limiting and guiding the T-shaped moving plate 27 is achieved, avoiding the T-shaped moving plate 27 from tilting due to force. Through the setting of the limiting rod 33, the purpose of guiding the contact plate 35 is achieved, avoiding the contact plate 35 from tilting during movement. Through the setting of the guiding vertical rod 31, the purpose of guiding the lifting plate 28 is achieved, avoiding the lifting plate 28 from tilting during movement. Through the setting of the support shaft 32, the purpose of supporting the right side of the U-shaped rotating rod 30 is achieved, avoiding the U-shaped rotating rod 30 from tilting due to rotational force.

[0050] Simulation design scheme

[0051] Using the optical simulation software Tracepro, the light fluxes at both ends and the incident light flux at the focus are compared and analyzed under the conditions that the ratio of the long axis to the short axis of the furnace chamber is 1.39 and 1.09, and the corresponding light flux cloud maps are formed to explore the influence of different long-axis and short-axis ratio structures on the light collection efficiency. At the same time, a control group is formed for the next research on the variable of the opening aperture. Considering that an observation hole needs to be designed at the top of the furnace chamber for in-situ observation and a halogen lamp needs to be installed by opening a hole at the bottom of the furnace chamber in actual use, the influence of different upper and lower opening apertures on the offset of the highest incident light flux at the ellipsoidal focus and the change of the high-temperature zone volume are simulated and analyzed, and then the influence of different opening apertures on the light collection efficiency of the furnace chamber with different long and short axis ratios is analyzed. In order to be closer to the actual experimental conditions, while simulating the situation of the furnace chamber when there is an experimental crucible, a metal block is used to simulate the platinum crucible when it is filled with samples. The offset of the highest light flux at the focus obtained by taking the upper and lower opening apertures as variables is studied. After correspondingly adjusting the central position of the metal block model to ensure that it is in the high-temperature zone, by simulating and analyzing the average light flux under the three-dimensional surface of the metal block, the influence of different opening apertures on the light collection efficiency of the experimental crucible is studied. At the same time, by verifying the average light flux of the furnace chamber with a long and short axis ratio of 1.39 and the experimental estimation amount, the rationality of this design calculation is verified, and the voltage required to heat the furnace chamber with a short axis ratio of 1.09 to 1300 °C is analogously calculated. From the perspective of the heating voltage required for the experiment, the advantage of the high light collection efficiency of the furnace chamber with a short axis ratio is compared and verified.

[0052] Simulation design calculation

[0053] ① The currently used furnace chamber

[0054] The influence of the furnace structure on the light illumination efficiency was analyzed using the optical simulation software Tracepro. First, the heating furnace currently used in the laboratory was simulated, and the influence of the aperture diameters of the upper and lower openings of the furnace on the light illumination efficiency was analyzed, as well as the change in efficiency after adding the metal block model.

[0055] The size of the light bulb can be seen in Table 1, and the center position of the light bulb is at one of the foci of the furnace. The luminous flux of the light bulb was set to 750 W, and the power of each surface was distributed according to the area ratio. The Lambertian emission field pattern was selected for the field angle distribution. The light illumination efficiency was analyzed using the incident luminous flux.

[0056] Table 1 Parameters of the light bulb for the confocal heating furnace

[0057]

[0058] The size of the furnace can be seen in Table 2, and the ratio of the major axis to the minor axis is 15:11 = 1.36. The furnace was set as a mirror with no absorption and total reflection.

[0059] Table 2 Parameters of the confocal ellipsoidal heating furnace

[0060] 2a major axis 2b minor axis 2c focal length f1 focus 1 f2 focus 2 150 110 102 24 126

[0061] ② No openings in the furnace

[0062] Figure 7 is the incident luminous flux on the inner surface of the furnace without openings. The luminous flux at both ends of the furnace is very high, with a maximum of 2 MW / m 2 , and the gold plating layer has a fast loss. The left end of the furnace was designed to be detachable for convenient removal and separate gold plating repair.

[0063] Figure 8 is the incident luminous flux on the XY plane at the focus, and a circular high-temperature area of φ10 mm can be clearly seen. Figure 9 is for the 30×48 mm YZ central plane of the furnace without openings 2 incident luminous flux, and the incident luminous flux reaches a maximum of 26.66 MW / m 2 , and the maximum incident luminous flux is about 0.5 mm below the focus. Since the furnace is symmetric about the Z axis, therefore, combining Figure 8 and Figure 9 analysis shows that the central high-temperature area is approximately a spherical area of φ5 mm, and the sub-high-temperature area is a cylindrical area of φ10 mm×11 mm.

[0064] ③ Openings at both ends of the furnace

[0065] Figure 10 is the incident luminous flux on the 30×48 mm YZ central plane of the furnace with openings 2 incident luminous flux, and the shape of the high-temperature area is the same as Figure 9In comparison, the analysis of the light concentration efficiency in the high-temperature region under different orifice conditions is as follows: (a) When the orifice diameter is φ10mm, the high-temperature region is a cylinder with a size of φ10mm×11mm, removing a small cone with a size of φ5mm×5mm. The highest incident light flux is located approximately 1mm below the focus of the ellipsoid. (b) When the orifice diameter is φ20mm, the high-temperature region is a cylinder with a size of φ10mm×10mm, removing a cone with a size of φ10mm×5mm. The highest incident light flux is located approximately 2mm below the focus of the ellipsoid. (c) When the orifice diameter is φ25mm, the high-temperature region is a cylinder with a size of φ10mm×8mm, removing a cone with a size of φ10mm×3mm. The highest incident light flux is located approximately 2.5mm below the focus of the ellipsoid. (d) When the orifice diameter is φ30mm, the high-temperature region is a cylinder with a size of φ10mm×7mm, removing a cone with a size of φ10mm×3mm. The highest incident light flux is located approximately 3mm below the focus of the ellipsoid. (e) For the current furnace used for crystallization performance testing, the orifice range is φ10mm - 30mm. The high-temperature region is a cylinder with a size of φ10mm×9mm, removing a sphere with a size of φ5mm. The highest incident light flux is located approximately 2.5mm below the focus of the ellipsoid.

[0066] Inputting the above data into Table 3, it can be seen from Table 3 that the orifice at the end close to the bulb has the greatest impact on the maximum light flux, while the orifice close to the observation hole has a smaller impact on the maximum light flux, but it has a greater impact on the volume of the high-temperature region.

[0067] Table 3 Influence of Orifice Diameters at Both Ends of the Furnace on Light Flux and High-Temperature Region

[0068]

[0069] ④ Adding metal blocks to the furnace

[0070] From the simulation results in ③, it can be seen that after opening orifices at both ends of the furnace, the actual position of the highest light flux in the furnace will deviate from the focus. Therefore, the center of the metal block is deviated 2.5mm from the focus, and the size of the metal block is φ6mm×5mm. Figure 11 Incident light flux of the YZ central plane 30×48mm after adding metal blocks to the furnace 2 As the orifices at both ends of the furnace increase, the high-temperature region above the metal block gradually disappears. The opening on the bulb side has a very large impact on the high-temperature region above the metal block, while the opening of the observation port has a smaller impact on the high-temperature region above the metal block.

[0071] Figure 12is the luminous flux on the inner surface of the furnace chamber without openings at both ends. For other opening conditions, the average luminous flux of the three surfaces of the metal block is incorporated into Table 4. As can be seen from Table 4, the opening "10 - 30" is the normal test condition, and the opening "30 - 30" is when the upper cover is removed. After removing the upper cover, the luminous flux of the metal block becomes 59% of that under normal conditions, which is close to the estimated 65% in the experiment. Therefore, by verifying the voltage required to raise the temperature to 1300 °C with a shielding tube under the existing test conditions, the rationality of this calculation can be verified. So, assuming that the filament resistance changes little at high temperatures, it is verified that 40 V is required for normal heating to 1300 °C, and 52.2 V is required after removing the upper cover.

[0072] Figure 12 is the luminous flux on the inner surface of the furnace chamber without openings at both ends. For other opening conditions, the average luminous flux of the three surfaces of the metal block is incorporated into Table 4.

[0073] Table 4 Influence of the aperture of the openings at both ends of the furnace chamber on the luminous flux of the metal block surface (MW / m 2 )

[0074]

[0075] As can be seen from Table 4, the opening "10 - 30" is the normal test condition, and the opening "30 - 30" is when the upper cover is removed. After removing the upper cover, the luminous flux of the metal block becomes 59% of that under normal conditions, which is close to the estimated 65% in the experiment. Therefore, by verifying the voltage required to raise the temperature to 1300 °C with a shielding tube under the existing test conditions, the rationality of this calculation can be verified. So, assuming that the filament resistance changes little at high temperatures, it is verified that 40 V is required for normal heating to 1300 °C, and 52.2 V is required after removing the upper cover.

[0076] ⑤ Design a fat spherical furnace chamber

[0077] The selected aspect ratio of the major and minor axes is 12:11 = 1.09 for the fat spherical furnace chamber. The dimensions of the furnace chamber are shown in Table 5. The simulation parameters are set for the mirror, with no absorption and total reflection.

[0078] Table 5 Parameters of the confocal ellipsoidal heating furnace chamber of the fat spherical furnace chamber

[0079] 2a major axis 2b minor axis 2c focal length f1 focus 1 f2 focus 2 120 110 48 36 84

[0080] ⑥ The furnace chamber has no openings

[0081] Figure 13 is the incident luminous flux on the inner surface of the fat spherical furnace chamber. The luminous flux at both ends of the furnace chamber is very high, with a maximum of 1.2 MW / m 2 , much lower than 2.0 MW / m of the slender type 2 .

[0082] Figure 14is the incident luminous flux on the XY plane at the focus of the fat spherical furnace, and it can be clearly seen that there is a circular high-temperature area with a diameter of φ10mm. Figure 15 is the YZ central plane of the unopened fat spherical furnace, with dimensions of 30×48mm 2 incident luminous flux, and the highest incident luminous flux reaches 31.76MW / m 2 , and the highest incident luminous flux is about 0.5mm below the focus. Since the furnace is symmetric about the Z axis, therefore, combining Figure 14 and Figure 15 analysis shows that the high-temperature area is a cylinder with a diameter of φ10mm×11mm.

[0083] ⑦ Openings at both ends of the furnace

[0084] Figure 16 is the YZ central plane of the opened fat spherical furnace, with dimensions of 30×48mm 2 incident luminous flux. Compared with the shape of the high-temperature area of Figure 15 , the analysis is as follows: (a) When the opening diameter is φ10-φ10mm, the high-temperature area is a cylinder with a diameter of φ10mm×11mm, removing a small cone with a diameter of φ4mm×6mm, and the highest incident luminous flux is about 2mm below the ellipsoid focus; (b) When the opening diameter is φ10-φ25mm, the high-temperature area is a cylinder with a diameter of φ10mm×10mm, removing a cone with a diameter of φ9mm×5mm, and the highest incident luminous flux is about 2mm below the ellipsoid focus; (c) When the opening diameter is φ10-φ30mm, the high-temperature area is a cylinder with a diameter of φ10mm×10mm, removing a cone with a diameter of φ9mm×5.5mm, and the highest incident luminous flux is about 2.5mm below the ellipsoid focus; (d) When the opening diameter is φ20-φ20mm, the high-temperature area is a cylinder with a diameter of φ10mm×10mm, removing a cone with a diameter of φ7mm×6mm, and the highest incident luminous flux is about 2mm below the ellipsoid focus; (e) When the opening diameter is φ25-φ25mm, the high-temperature area is a cylinder with a diameter of φ10mm×10mm, removing a cone with a diameter of φ10mm×6mm, and the highest incident luminous flux is about 2.5mm below the ellipsoid focus; (f) When the opening diameter is φ30-φ30mm, the high-temperature area is a cylinder with a diameter of φ10mm×9mm, removing a cone with a diameter of φ10mm×5mm, and the highest incident luminous flux is about 2.5mm below the ellipsoid focus.

[0085] Input the above data into Table 6. From Table 6, it can be seen that the openings at the ends of the fat spherical furnace have relatively little influence on the maximum luminous flux and high-temperature volume. Moreover, the highest luminous flux of this furnace type is about 1.5 times that of the slender furnace. If the scale range of the cloud map is the same, the high-temperature area of the fat spherical furnace will be larger.

[0086] Table 6 Influence of the aperture of the openings at both ends of the fat spherical furnace on the luminous flux and high-temperature area

[0087]

[0088] ⑧Add metal blocks into the furnace

[0089] From the simulation results in ⑦, it can be seen that after the holes are opened at both ends of the furnace, the actual position of the highest luminous flux in the furnace will deviate from the focus. Therefore, the center of the metal block is deviated from the focus by 2.5mm, and the size of the metal block is φ6mm×5mm. Figure 17 After adding metal blocks to the fat ball furnace, the YZ center plane is 30×48mm 2 For the incident light flux, the openings at both ends of the furnace have a similar influence on the high-temperature area around the metal block. The difference is that there are more high-temperature areas above the metal block in the fat ball-type furnace.

[0090] Figure 18 The luminous flux of the inner surface of the fat ball-shaped furnace with no openings at both ends of the metal block is calculated. The other openings are calculated and the average luminous flux of the three surfaces of the metal block is summarized in Table 7.

[0091] Table 7 Effect of the aperture diameter at both ends of the fat ball furnace on the luminous flux on the metal block surface (MW / m 2 )

[0092]

[0093] As shown in Table 7, unlike the slender furnace, the size of the opening of the fat ball furnace has little effect on the luminous flux of the metal block. By comparing "φ30-φ30" and "φ10-φ30", it is found that the effect of the opening close to the observation port is almost negligible. Moreover, the average luminous flux of the metal block in all opening conditions is greater than that of the slender furnace without openings. Therefore, the slender furnace needs 40V to heat normally to 1300℃, and the average luminous flux is 5.45MW / m 2 , based on this calculation, the voltage required for the fat ball type furnace after heating is about 31 to 33V.

[0094] By comparing the old ellipsoidal heating furnace and the new fat ball heating furnace for high temperature confocal microscope, it is found that the heating power required by the fat ball heating furnace when heating to 1300℃ is significantly lower than that of the old ellipsoidal heating furnace. The calculation results show that the opening value of the fat ball heating furnace is 19%, while that of the old ellipsoidal heating furnace is 24%, which means that the fat ball heating furnace only needs about 65% of the heating power of the old type.

[0095] The working principle of the present invention is as follows: Through the setting of the sample placement rack 13, the crucible required for placing the sample can be supported inside the furnace body 1 and the furnace chamber body 23. And through the setting of the halogen lamp body 15, infrared rays can be generated during the experiment, and after being reflected by the inner cavity of the furnace chamber body 23, they converge on the surface of the sample inside the crucible, so that the temperature of the sample surface can rise rapidly, facilitating the personnel to conduct an effective heating experiment on the sample. And when the filament of the halogen lamp body 15 is deformed or broken during long-term use and needs to be replaced, by starting the driving motor 20 to work, the adjusting screw rod 38 can be driven to rotate. When the adjusting screw rod 38 rotates, it can drive the L-shaped moving rod 19 and the T-shaped moving plate 27 to move to the left. At the same time, the pre-stretched deformation of the support spring 26 can gradually move to the left for reset. And during the process of the support spring 26 gradually moving for reset, the T-shaped moving plate 27 can be separated from the right side of the contact plate 35, so that the reaction force of the pre-compressed torsion spring 11 can be released, driving the rotating cylinder 34 and the U-shaped rotating rod 30 to rotate. While the rotating cylinder 34 rotates, it can push the T-shaped guide rod 36 and the contact plate 35 to move to the left through the arc-shaped guide groove 37. At the same time, when the U-shaped rotating rod 30 rotates, it can drive the lifting plate 28 and the halogen lamp body 15 to move downward through the connecting rod 29, so that the halogen lamp body 15 can be completely received inside the moving box 21. Subsequently, during the continuous movement of the L-shaped moving rod 19 and the T-shaped moving plate 27 to the left, the protective baffle 17, the fixed rod 25 and the moving box 21 can be pushed to move to the left through the support spring 26 until the moving box 21 and the halogen lamp body 15 can be separated from the inside of the furnace body 1, and then the personnel can disassemble and replace the halogen lamp body 15. And when the experiment needs to be carried out again after the halogen lamp body 15 is replaced, by starting the driving motor 20 to work, the adjusting screw rod 38 can be driven to rotate in the other direction. When the adjusting screw rod 38 rotates, it can drive the L-shaped moving rod 19, the T-shaped moving plate 27, the support spring 26, the protective baffle 17, the fixed rod 25, the moving box 21 and the halogen lamp body 15 to move to the right, so that the moving box 21 and the halogen lamp body 15 can extend into the inside of the furnace body 1. At the same time, the protective baffle 17 can contact the left side of the outer surface of the furnace body 1, so as to seal and protect the opening on the left side of the furnace body 1. At the same time, under the continuous movement of the L-shaped moving rod 19 and the T-shaped moving plate 27, the support spring 26 can be stretched, and the T-shaped moving plate 27 can contact the left side of the contact plate 35, and push the contact plate 35 and the T-shaped guide rod 36 to move to the right. While the T-shaped guide rod 36 moves, it can push the rotating cylinder 34 to rotate through the arc-shaped guide groove 37, so as to apply pressure to the torsion spring 11. While the rotating cylinder 34 rotates, it can drive the U-shaped rotating rod 30 to rotate, and through the connecting rod 29, it can push the lifting plate 28 and the halogen lamp body 15 to move upward.Until the upper end of the halogen lamp body 15 can extend into the interior of the furnace body 23, which facilitates subsequent test operations by personnel. The overall operation is convenient and fast, greatly facilitating the replacement operation of the halogen lamp body 15 inside by personnel during use, improving the efficiency of the replacement operation by personnel, and facilitating personnel to use.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An ultra-high temperature confocal ellipsoidal heating furnace with high efficiency, comprising a furnace chamber having an ellipsoidal chamber and a halogen lamp body (15) located in the ellipsoidal chamber, characterized in that: A sample placement rack (13) is connected inside the furnace chamber. The ratio of the major axis to the minor axis of the ellipsoidal chamber of the furnace chamber is 1.10 - 1.

35. The material of the furnace chamber is selected as heat-resistant aluminum alloy, and a cooling water channel is formed on the side of the furnace chamber; it also includes an air outlet pipe and an air inlet pipe communicated with the furnace chamber. The air outlet pipe is located on the upper side and the air inlet pipe is located on the lower side; it also includes two water pipes communicated with the cooling water channel.

2. An energy-efficient ultra-high temperature confocal ellipsoidal heating furnace according to claim 1, characterized in that: The ratio of the major axis to the minor axis of the ellipsoidal chamber in the furnace chamber is controlled within 1.10 - 1.

35. To balance the distance between the halogen lamp body (15) and the sample placement rack (13), the ratio of the major axis to the minor axis should be controlled within 1.15 - 1.

25.

3. An efficient ultra-high temperature confocal ellipsoidal heating furnace according to claim 1, characterized in that: The specific material of the furnace chamber is 2A16 of the Al-Cu-Mn system or 2A02 of the Al-Cu-Mg system. The heat-resistant aluminum alloy can ensure that the furnace wall remains smooth after being heated.

4. An efficient ultra-high temperature confocal ellipsoidal heating furnace according to claim 1, characterized in that: The diameter of the cooling water channel is 8 - 12 mm, avoiding the occurrence of dead zones during cooling, which may cause the local temperature of the furnace chamber to be relatively high and the furnace chamber to become rough due to heat.

5. An efficient ultra-high temperature confocal ellipsoidal heating furnace according to claim 1, characterized in that: The cooling water channel is divided into 2 - 3 layers of water circuits, and the adjacent water circuits are connected end to end.

6. The high-performance ultra-high temperature confocal ellipsoidal heating furnace according to claim 1, wherein: The connection between the air inlet pipe and the furnace chamber is arranged to slope upwards, so that the gas can be reflected to the focus of the ellipsoidal furnace chamber where the sample is placed after entering the inner cavity of the furnace chamber, avoiding the air inlet pipe directly aiming at the focus and blowing off the sample. When cooling gas is introduced, the gas design of upper outlet and lower inlet can ensure that the cooling gas quickly contacts the sample for cooling.

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