Erbium-doped yttrium aluminum garnet crystal production temperature field structure

Abstract

The utility model relates to the technical field of crystal production temperature fields, and discloses an erbium-doped yttrium aluminum garnet crystal production temperature field structure which comprises a metal cover sleeved on the outer side of a crucible, and the metal cover is located in the middle of the upper end of a base inside a box body; the outer side of the metal cover is sleeved with heaters which are distributed at equal intervals up and down, middle heat preservation spaces are formed in the heaters, outer heat preservation spaces are formed between the heaters and the heat preservation cylinder, inner heat preservation spaces are formed between the heaters and the metal cover, and air guide pipes located in the inner heat preservation spaces are connected between the adjacent annular bases; the inner side heat preservation space, the middle heat preservation space and the outer side heat preservation space on the outer side of the crucible are all filled with high-temperature air, heat preservation of the crucible is achieved, meanwhile, hot air in the inner side heat preservation space can be prevented from entering the middle heat preservation space and the outer side heat preservation space through the arrangement of the air guide pipes, and the heat preservation effect is good. The highest temperature of air in the inner side heat preservation space is guaranteed, and the heat preservation effect on the crucible is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of crystal production temperature fields, and particularly relates to a temperature field structure for producing erbium-doped yttrium aluminum garnet crystals. Background Art

[0002] The erbium-doped yttrium aluminum garnet crystal belongs to the cubic crystal system and has a wide range of applications, especially in laser medicine, laser communication, laser ranging, etc. Generally, a crucible is heated to an appropriate temperature so that the erbium-doped yttrium aluminum garnet crystal grows in the crucible. For example, the Chinese patent with the publication number CN219363872U discloses a temperature field structure for producing high-concentration non-scattering erbium-doped yttrium aluminum garnet crystals, which includes a crucible. A heat insulation layer is arranged outside the crucible, and a heating structure is arranged outside the heat insulation layer. The heating structure includes a plurality of heaters that are annular and sequentially sleeved outside the heat insulation layer in the vertical direction. A partition layer is arranged between adjacent heaters. Temperature sensors for temperature measurement are arranged on the outer wall of the crucible corresponding to each heater area. Each temperature sensor is electrically connected to a temperature controller, and the temperature controller is also electrically connected to each heater. The output power of the corresponding heater is adjusted through the temperature feedback of the temperature sensor. An arc-shaped reflection screen covering the upper part is arranged at the top opening of the crucible, and an operation hole is left at the center position of the arc-shaped reflection screen.

[0003] However, the above solution has the following deficiencies: only the heat insulation layer outside the crucible is used for heat insulation, and the heat insulation effect is not good. The heat of the crucible is easily dissipated after passing through the heat insulation layer, and it cannot meet the temperature requirements for the growth of erbium-doped yttrium aluminum garnet crystals. Therefore, we introduce a temperature field structure for producing erbium-doped yttrium aluminum garnet crystals. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a temperature field structure for producing erbium-doped yttrium aluminum garnet crystals to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A temperature field structure for producing erbium-doped yttrium aluminum garnet crystals includes a metal cover sleeved outside the crucible, and the metal cover is located at the upper middle part of a base inside the box body;

[0007] The outside of the metal cover is sleeved with heaters distributed at equal intervals up and down. The outside of the heaters is sleeved with a heat insulation cylinder, and adjacent heaters are fixed by an annular seat. The top of the heat insulation cylinder is fixed with an arc-shaped reflection cover directly above the crucible. A circular sealing ring is connected between the top inside of the heater and the top of the metal cover;

[0008] The interior of the heater is provided with a middle heat preservation space, an outer heat preservation space is arranged between the heater and the heat preservation cylinder, an inner heat preservation space is arranged between the heater and the metal cover, and a gas guide pipe located in the inner heat preservation space is connected between adjacent annular seats;

[0009] The air heated inside the crucible enters the middle heat preservation space through the air guide mechanism on the arc-shaped reflector cover, and then enters the outer heat preservation space and the inner heat preservation space, realizing the heat preservation of the crucible. At the same time, the setting of the gas guide pipe can also prevent the hot air in the inner heat preservation space from entering the middle heat preservation space and the outer heat preservation space.

[0010] Preferably, the heater includes an inner ring and an outer ring located outside the inner ring, and the upper and lower parts between the inner ring and the outer ring are connected by a plurality of groups of connecting plates distributed at equal intervals.

[0011] Preferably, an induction heating coil is integrated in the inner ring, and the metal cover is heated after the induction heating coil is electrified.

[0012] Preferably, annular grooves for inserting the heater are provided on the upper and lower end surfaces of the annular seat, a plurality of groups of through holes are provided on the annular grooves, a gas guide hole communicated with the through holes is provided in the middle of the outer side wall of the annular seat, the gas guide pipe is fixed on the inner wall of the annular seat, and the gas guide pipe is communicated with the inner side end of the through hole, and a plurality of groups of openings are provided on the surface of the gas guide pipe.

[0013] There are four groups of the gas guide pipes, and the four groups of gas guide pipes are fixed on the inner wall of the annular seat at equal intervals.

[0014] Preferably, an electric heating rod is installed on the inner wall of the outer ring, the electric heating rod extends into the middle heat preservation space, and the electric heating rod is used to heat the air in the middle heat preservation space.

[0015] Preferably, the air guide mechanism includes an intermediate platform fixed in the middle of the lower end of the arc-shaped reflector cover and air guide boxes equally spaced on the lower end surface of the arc-shaped reflector cover;

[0016] The inner side end of the air guide box is connected to the intermediate platform, a heat collection hole is provided in the middle of the intermediate platform, a hollow convex box is provided at the end of the air guide box, the hollow convex box is communicated with the heat collection hole through a gas guide channel inside the air guide box, and the hollow convex box is inserted between adjacent connecting plates.

[0017] Preferably, the height of one end of the gas guide channel close to the hollow convex box is lower than the height of one end of the gas guide channel close to the heat collection hole.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows: The air heated inside the crucible of the present utility model enters the middle heat preservation space through the air guiding mechanism on the arc-shaped reflector cover, and then enters the outer heat preservation space and the inner heat preservation space. The inner heat preservation space, the middle heat preservation space, and the outer heat preservation space outside the crucible are all filled with high-temperature air, achieving heat preservation of the crucible. At the same time, the setting of the air guide pipe can also prevent the hot air in the inner heat preservation space from entering the middle heat preservation space and the outer heat preservation space, ensuring that the temperature of the air in the inner heat preservation space is the highest and guaranteeing the heat preservation effect of the crucible. Description of the Drawings

[0019] Figure 1 It is a schematic cross-sectional structure diagram of the whole of the present utility model;

[0020] Figure 2 It is a schematic three-dimensional structure diagram of the heater of the present utility model;

[0021] Figure 3 It is a schematic three-dimensional structure diagram of the air guide pipe connected to the annular seat of the present utility model;

[0022] Figure 4 It is a schematic exploded structure diagram of the installation of the annular sealing ring of the present utility model;

[0023] Figure 5 For the present utility model Figure 4 Schematic three-dimensional structure diagram after assembly;

[0024] Figure 6 For the present utility model Figure 5 Schematic vertical cross-sectional view of the right-side structure in the present utility model;

[0025] Figure 7 It is a schematic cross-sectional structure diagram of the connection between the arc-shaped reflector cover and the air guiding mechanism of the present utility model;

[0026] Figure 8 It is a schematic three-dimensional structure diagram of the connection between the arc-shaped reflector cover and the air guiding mechanism of the present utility model.

[0027] In the figure: 1, crucible; 2, metal cover; 3, base; 4, heat preservation cylinder; 5, box body; 6, outer heat preservation space; 7, annular seat; 8, air guide pipe; 9, inner ring; 10, induction heating coil; 11, outer ring; 12, electric heating rod; 13, middle heat preservation space; 14, inner heat preservation space; 15, arc-shaped reflector cover; 16, middle platform; 161, heat collection hole; 17, air guide box; 171, hollow convex box; 172, air guide channel; 18, annular sealing ring; 19, connecting plate; 20, annular groove; 21, air guide hole; 22, opening; 23, through hole. Detailed Embodiments

[0028] 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.

[0029] Embodiment:

[0030] Please refer to Figure 1-8 , the present invention provides a technical solution:

[0031] A temperature field structure for producing erbium-doped yttrium aluminum garnet crystal, comprising a metal cover 2 sleeved outside the crucible 1, and the metal cover 2 is located at the upper middle part of a base 3 inside a box body 5;

[0032] The outside of the metal cover 2 is sleeved with heaters distributed at equal intervals up and down. The heater includes an inner ring 9 and an outer ring 11 located outside the inner ring 9, and the upper and lower parts between the inner ring 9 and the outer ring 11 are connected by several groups of connecting plates 19 distributed at equal intervals.

[0033] An induction heating coil 10 is integrated in the inner ring 9. After the induction heating coil 10 is electrified, it realizes the heating of the metal cover 2, so that the metal cover 2 transfers the temperature to the crucible 1 to realize the growth of erbium-doped yttrium aluminum garnet crystal inside the crucible 1.

[0034] A heat preservation cylinder 4 is sleeved outside the heater. The heat preservation cylinder 4 plays a role in heat preservation for the crucible 1 and the outside of the metal cover 2, reducing heat dissipation.

[0035] The bottom of the heat preservation cylinder 4 is located on the base 3, and the lowermost heater is also located on the base 3. The top of the heat preservation cylinder 4 is stuck on the outer ring 11 at the top. An annular sealing ring 18 is fixed between the top of the uppermost inner ring 9 and the top of the metal cover 2 to realize the sealing of the top of the inner heat preservation space 14;

[0036] And adjacent heaters are fixed by an annular seat 7. Annular grooves 20 for inserting heaters are provided on the upper and lower end surfaces of the annular seat 7. In this way, the fixation of the heater and the annular seat 7 is simple, and the annular seat 7 can separate adjacent heaters to avoid mutual influence between two adjacent heaters.

[0037] A number of groups of through holes 23 are provided on the annular groove 20. An air guide hole 21 communicating with the through holes 23 is provided in the middle of the outer side wall of the annular seat 7. An air guide pipe 8 is fixed on the inner wall of the annular seat 7, and the air guide pipe 8 is communicated with the inner side end of the through holes 23. A number of groups of openings 22 are provided on the surface of the air guide pipe 8.

[0038] This enables communication between the outer heat-insulating space 6, the middle heat-insulating space 13, and the inner heat-insulating space 14. The hot air entering from the middle heat-insulating space 13 can also enter the outer heat-insulating space 6 and the inner heat-insulating space 14 respectively, thereby achieving heat preservation for the crucible 1 through the hot air.

[0039] Meanwhile, since the inner heat-insulating space 14 is closest to the metal cover 2, after the induction heating coil 10 is energized to heat the metal cover 2, the temperature of the air in the inner heat-insulating space 14 is the highest. This causes the air inside the inner heat-insulating space 14 to expand due to heat. At this time, if the outer heat-insulating space 6, the middle heat-insulating space 13, and the inner heat-insulating space 14 are directly connected, the air in the inner heat-insulating space 14 will be lost to the middle heat-insulating space 13 and the outer heat-insulating space 6, thereby reducing the temperature of the air in the inner heat-insulating space 14 and further reducing the heat preservation effect for the crucible 1.

[0040] The air inside the inner heat-insulating space 14 expands due to heat and needs to enter the air duct 8 through the opening 22. It can enter the outer heat-insulating space 6 and the middle heat-insulating space 13 only after the air inside the air duct 8 is filled. However, the inner diameter of the opening 22 is small, which reduces the speed of the air inside the inner heat-insulating space 14 entering the air duct 8 and increases the time for the air inside the air duct 8 to be filled. During this period, the high-temperature air inside the crucible 1 has already risen upward through the heat collection hole 161, the air guide channel 172, and the middle heat-insulating space 13 and entered the outer heat-insulating space 6 and the air duct 8. After the high-temperature air inside the crucible 1 enters the air duct 8, it then enters the inner heat-insulating space 14 through the opening 22, thereby preventing the hot air in the inner heat-insulating space 14 from entering the middle heat-insulating space 13 and the outer heat-insulating space 6. The temperature of the air in the inner heat-insulating space 14 is the highest, ensuring the heat preservation effect for the crucible 1.

[0041] There are four groups of air ducts 8, and the four groups of air ducts 8 are fixed on the inner wall of the annular seat 7 at equal intervals.

[0042] An arc-shaped reflecting cover 15 located directly above the crucible 1 is fixed at the top of the heat-insulating cylinder 4, and an annular sealing ring 18 is connected between the inner top of the heater and the top of the metal cover 2.

[0043] The heater internally has a middle heat-insulating space 13, an outer heat-insulating space 6 is provided between the heater and the heat-insulating cylinder 4, an inner heat-insulating space 14 is provided between the heater and the metal cover 2, and air ducts 8 located in the inner heat-insulating space 14 are connected between adjacent annular seats 7.

[0044] The air heated inside the crucible 1 enters the middle heat-insulating space 13 through the air guiding mechanism on the arc-shaped reflecting cover 15, and then enters the outer heat-insulating space 6 and the inner heat-insulating space 14, achieving heat preservation for the crucible 1.

[0045] Meanwhile, the arrangement of the air duct 8 can also prevent the hot air in the inner heat preservation space 14 from flowing into the middle heat preservation space 13 and the outer heat preservation space 6.

[0046] After the high-temperature air inside the crucible 1 rises upward through the heat collecting holes 161, the air guiding channels 172 and the middle heat preservation space 13 and enters the outer heat preservation space 6 and the inner heat preservation space 14, it can also prevent the high-temperature air inside the crucible 1 from flowing downward into the crucible 1 again and directly acting on the erbium-doped yttrium aluminum garnet crystal inside the crucible 1, avoiding an increase in the thermal stress of the erbium-doped yttrium aluminum garnet crystal.

[0047] An electric heating rod 12 is installed on the inner wall of the outer ring 11 and extends into the middle heat preservation space 13. During the initial heating stage of the crucible 1, the temperature generated by the air inside it is not high enough. At this time, the electric heating rod 12 can be powered on to heat the air in the middle heat preservation space 13. In this way, the air in the crucible 1 enters the outer heat preservation space 6 and the inner heat preservation space 14 through the heat collecting holes 161, the air guiding channels 172 and the middle heat preservation space 13, so as to quickly insulate the crucible 1 with hot air and avoid the situation that the heating speed of the crucible 1 is low due to heat dissipation outward.

[0048] The air guiding mechanism includes an intermediate platform 16 fixed to the middle of the lower end of the arc-shaped reflector 15 and air guiding boxes 17 evenly distributed on the lower end surface of the arc-shaped reflector 15;

[0049] The inner side end of the air guiding box 17 is connected to the intermediate platform 16. A heat collecting hole 161 is provided in the middle of the intermediate platform 16. A hollow convex box 171 is provided at the end of the air guiding box 17. The hollow convex box 171 is communicated with the heat collecting hole 161 through an air guiding channel 172 inside the air guiding box 17, and the hollow convex box 171 is inserted between the adjacent connecting plates 19.

[0050] The air guiding channel 172 is inclined with a lower outer bottom and a higher inner part, that is, the height of the end of the air guiding channel 172 close to the hollow convex box 171 is lower than the height of the end of the air guiding channel 172 close to the heat collecting hole 161. Such an arrangement enables the high-temperature air inside the crucible 1 to quickly diffuse into the outer heat preservation space 6 and the inner heat preservation space 14 through the middle heat preservation space 13 after passing through the heat collecting hole 161 and the air guiding channel 172 upward.

[0051] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A temperature field structure for producing erbium-doped yttrium aluminum garnet crystals, including a metal cover sleeved outside a crucible, characterized in that: The metal cover is located at the middle upper end of the base inside the box body; Heaters are sleeved outside the metal cover and are distributed at equal intervals up and down. A heat preservation cylinder is sleeved outside the heaters. Adjacent heaters are fixed by an annular seat. An arc-shaped reflector is fixed at the top of the heat preservation cylinder and is located directly above the crucible. An annular sealing ring is connected between the top of the inner side of the heater and the top of the metal cover; A middle heat preservation space is arranged inside the heater. An outer heat preservation space is arranged between the heater and the heat preservation cylinder. An inner heat preservation space is arranged between the heater and the metal cover. An air guide pipe is connected between adjacent annular seats and is located in the inner heat preservation space; The air heated inside the crucible enters the middle heat preservation space through the air guide mechanism on the arc-shaped reflector and then enters the outer heat preservation space and the inner heat preservation space, so as to realize the heat preservation of the crucible. At the same time, the arrangement of the air guide pipe can also prevent the hot air in the inner heat preservation space from flowing into the middle heat preservation space and the outer heat preservation space.

2. The temperature field structure for producing erbium-doped yttrium aluminum garnet crystal according to claim 1, characterized in that: The heater includes an inner ring and an outer ring located outside the inner ring. The upper and lower parts between the inner ring and the outer ring are connected by a number of groups of connecting plates distributed at equal intervals.

3. The temperature field structure for producing erbium-doped yttrium aluminum garnet crystal according to claim 2, wherein: An induction heating coil is integrated in the inner ring. After the induction heating coil is electrified, the metal cover is heated.

4. The temperature field structure for producing erbium-doped yttrium aluminum garnet crystal according to claim 1, characterized in that: Annular grooves for inserting the heater are provided on the upper and lower end surfaces of the annular seat. A number of groups of through holes are provided on the annular groove. An air guide hole communicated with the through holes is provided in the middle of the outer side wall of the annular seat. The air guide pipe is fixed on the inner wall of the annular seat and is communicated with the inner side end of the through hole. A number of groups of openings are provided on the surface of the air guide pipe.

5. A temperature field structure for producing erbium-doped yttrium aluminum garnet crystal according to claim 4, characterized in that: Four groups of air guide pipes are provided, and the four groups of air guide pipes are fixed on the inner wall of the annular seat at equal intervals.

6. The temperature field structure for producing erbium-doped yttrium aluminum garnet crystal according to claim 2, characterized in that: Electric heating rods are installed on the inner wall of the outer ring, and the electric heating rods extend into the middle heat preservation space. The electric heating rods are used to heat the air in the middle heat preservation space.

7. A temperature field structure for producing erbium-doped yttrium aluminum garnet crystal according to claim 2, characterized in that: The air guide mechanism includes an intermediate platform fixed at the middle lower end of the arc-shaped reflector and air guide boxes equally spaced on the lower end surface of the arc-shaped reflector; The inner side end of the air guide box is connected to the intermediate platform. A heat collecting hole is provided in the middle of the intermediate platform. A hollow convex box is provided at the end of the air guide box. The hollow convex box is communicated with the heat collecting hole through the air guide channel inside the air guide box, and the hollow convex box is inserted between adjacent connecting plates.

8. A temperature field structure for producing erbium-doped yttrium aluminum garnet crystals according to claim 7, characterized in that: The height of one end of the air guide channel close to the hollow convex box is lower than the height of one end of the air guide channel close to the heat collecting hole.

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