Hot zone assembly and single crystal furnace apparatus

Abstract

The application relates to a hot field assembly and a single crystal furnace device, the hot field assembly and the single crystal furnace device comprising a flow guide cylinder, a lower heat preservation cover, a lifting mechanism for driving the flow guide cylinder to pass through the inner ring of the lower heat preservation cover and being movable up and down relative to the lower heat preservation cover, the hot field assembly further comprising a heat preservation ring and a transmission mechanism; the heat preservation ring is located at the lower heat preservation cover, and the heat preservation ring comprises at least two heat preservation units for surrounding the flow guide cylinder, so that the heat preservation ring can be folded or unfolded; the transmission mechanism is connected with the lifting mechanism and the heat preservation units, and the folding or unfolding of the heat preservation ring is controlled based on the rising or falling of the output end of the lifting mechanism. When the flow guide cylinder moves to an upper limit position, a gap appears between the flow guide cylinder and the lower heat preservation cover, at this time, the heat preservation ring surrounds the flow guide cylinder and seals the gap between the flow guide cylinder and the lower heat preservation cover, heat leakage is reduced, the heat preservation effect is improved, and the heat preservation ring can also heat the flow guide cylinder, so that the heat preservation effect of the flow guide cylinder is improved.

Description

Technical Field

[0001] This application relates to the field of Czochralski single crystal technology, and in particular to a thermal field component and a single crystal furnace device. Background Technology

[0002] During the melting and re-addition of materials in a single crystal furnace, due to the large volume of solid materials, in order to avoid the material blocks sticking to the water-cooled screen and the guide tube during the melting process, the water-cooled screen and the guide tube need to be raised to the upper limit position. However, when the water-cooled screen and the guide tube are moved to the upper limit position, heat leakage gaps inevitably appear between the guide tube and the lower insulation cover, resulting in heat loss. Utility Model Content

[0003] Based on this, a thermal field component and a single crystal furnace device are provided, which can seal the gap between the guide tube and the lower insulation cover to improve the insulation effect.

[0004] Therefore, in a first aspect, embodiments of this application provide a thermal field assembly, including a guide tube, a lower insulation cover, and a lifting mechanism that drives the guide tube to move up and down relative to the lower insulation cover through an inner ring. The thermal field assembly further includes:

[0005] A heat-insulating ring is located at the lower heat-insulating cover, and the heat-insulating ring includes at least two heat-insulating units for surrounding the guide tube, so that the heat-insulating ring can be closed or unfolded;

[0006] A transmission mechanism connects the lifting mechanism and the insulation unit, and controls the closing or opening of the insulation ring based on the rising or falling of the output end of the lifting mechanism.

[0007] In one embodiment, the transmission mechanism controls the closing of the insulation ring based on the rising of the output end of the lifting mechanism, such that in the first state, the guide tube is at the upper limit position and the insulation ring blocks the gap between the guide tube and the lower insulation cover.

[0008] The transmission mechanism controls the expansion of the insulation ring based on the descent of the output end of the lifting mechanism, so that in the second state, the guide tube is located at the lower limit position, the insulation ring is expanded, and the guide tube overlaps the inner ring of the lower insulation cover.

[0009] In one embodiment, the thermal field assembly further includes a water-cooled screen, which includes a vertical rod connected to the output end of the lifting mechanism, a horizontal rod perpendicularly connected to the vertical rod, and a screen body connected to the horizontal rod, wherein the guide tube is suspended on the horizontal rod, and the transmission mechanism is connected to the horizontal rod.

[0010] In one embodiment, the transmission mechanism includes:

[0011] A transmission rod extends longitudinally, with its upper end rotatably connected to the crossbar and its lower end rotatably connected to the lower insulation cover, wherein the transmission rod rotates at least when the lifting mechanism drives the crossbar to rise or fall;

[0012] A transmission gear is sleeved on the transmission rod and can rotate synchronously with the transmission rod;

[0013] A transmission rack extends laterally and one end meshes with the transmission gear, while the other end drives the insulation ring to close or open when the transmission gear rotates.

[0014] In one embodiment, the transmission rod includes at least a threaded section with external threads, a rotating ring is provided at the water-cooled screen, the rotating ring is sleeved on the transmission rod, and the inner wall of the rotating ring is provided with a protrusion for engaging the threaded section.

[0015] In one embodiment, the transmission rod further includes a first smooth section and a second smooth section, with the threaded section located between the first smooth section and the second smooth section.

[0016] In one embodiment, the transmission mechanism further includes an elastic component, one end of which is connected to the insulation ring and the other end of which is connected to the transmission rack.

[0017] In one embodiment, the resilient component includes:

[0018] A connecting cylinder has a closed end and an open end, the closed end being connected to the transmission rack;

[0019] The connecting rod has one end connected to the insulation ring and the other end extending into the connecting cylinder from the open end;

[0020] An elastic element is fitted onto the connecting rod. One end of the elastic element is connected to the connecting rod or one end of the insulation ring, and the other end of the elastic element is connected to the inside of the closed end of the connecting cylinder.

[0021] In one embodiment, the heat preservation unit is an arc-shaped segment; two transmission mechanisms are also provided and are respectively connected to the two heat preservation units, and the threaded segments of the two transmission rods are arranged in opposite directions.

[0022] Secondly, embodiments of this application provide a single crystal furnace apparatus, including a single crystal furnace and a thermal field component as described in any of the preceding claims.

[0023] The thermal field assembly and single crystal furnace device provided in the embodiments of this application include a guide tube, a lower insulation cover, and a lifting mechanism that drives the guide tube to move up and down relative to the lower insulation cover through an inner ring. The thermal field assembly also includes an insulation ring and a transmission mechanism. The insulation ring is located at the lower insulation cover and includes at least two insulation units for surrounding the guide tube, so that the insulation ring can be closed or opened. The transmission mechanism connects the lifting mechanism and the insulation units, and controls the closure or opening of the insulation ring based on the rise or fall of the output end of the lifting mechanism. When the guide tube moves to the upper limit position, a gap appears between the guide tube and the lower insulation cover. At this time, the ring surrounds the guide tube and seals the gap between the guide tube and the lower insulation cover, reducing heat leakage and improving the insulation effect. At the same time, the insulation ring can also insulate the guide tube, improving the insulation effect of the guide tube. Attached Figure Description

[0024] Figure 1 This diagram illustrates the structure of a single crystal furnace apparatus according to an embodiment of this application.

[0025] Figure 2 This illustration shows a top view of a single crystal furnace apparatus provided in an embodiment of this application;

[0026] Figure 3 This image shows a cross-sectional view of a single crystal furnace apparatus provided in an embodiment of this application in a first state;

[0027] Figure 4 This illustration shows a cross-sectional view of a single crystal furnace apparatus provided in an embodiment of this application in a second state;

[0028] Figure 5 This invention provides a schematic diagram of the transmission mechanism and heat preservation unit provided in an embodiment of the present application.

[0029] Figure 6 This illustration shows a cross-sectional view of a transmission mechanism and a heat preservation unit provided in an embodiment of this application;

[0030] Figure 7 This illustration shows a structural schematic diagram of a rotating ring provided in an embodiment of this application;

[0031] Figure 8 This illustration shows a cross-sectional view of a rotating ring and a threaded section according to an embodiment of this application;

[0032] Figure 9 This diagram illustrates the structure of a water-cooled screen and a flow guide provided in an embodiment of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Flow guide tube; 2. Water-cooled screen; 21. Rotating ring; 211. Protrusion; 22. Vertical rod; 23. Horizontal rod; 24. Screen body; 3. Lower insulation cover; 4. Insulation ring; 41. Insulation unit; 5. Transmission mechanism; 51. Transmission rod; 511. Threaded section; 512. First smooth section; 513. Second smooth section; 52. Transmission gear; 53. Transmission rack; 54. Elastic element; 55. Connecting cylinder; 56. Connecting rod; 6. Bearing; 7. Gap. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0036] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0037] The structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0038] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "transverse," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They 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 limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] During the melting and re-addition of materials in the single crystal furnace, due to the large volume of solid materials, in order to avoid the material blocks sticking to the water-cooled screen 2 and the guide cylinder 1 during the melting process, the water-cooled screen 2 and the guide cylinder 1 need to be raised to the upper limit position. As a result, a gap 7 inevitably appears between the guide cylinder 1 and the lower insulation cover 3, causing heat leakage and resulting in heat loss.

[0040] To solve the above problems, refer to Figures 1-4 , Figure 1 This diagram illustrates the structure of a single crystal furnace apparatus according to an embodiment of this application. Figure 2 This illustration shows a top view of a single crystal furnace apparatus provided in an embodiment of this application. Figure 3 This illustration shows a cross-sectional view of a single crystal furnace apparatus provided in an embodiment of this application in a first state. Figure 4 This is a cross-sectional view of a single crystal furnace apparatus provided in an embodiment of this application in a second state.

[0041] This application provides a thermal field assembly, including a flow guide tube 1, a lower insulation cover 3, and a lifting mechanism that drives the flow guide tube 1 through the inner ring of the lower insulation cover 3 and can move up and down relative to the lower insulation cover 3. The thermal field assembly also includes an insulation ring 4 and a transmission mechanism 5. The insulation ring 4 is located at the lower insulation cover 3 and includes at least two insulation units 41 for surrounding the flow guide tube 1 so that the insulation ring 4 can be closed or opened. The transmission mechanism 5 connects the lifting mechanism and the insulation units 41, and controls the closure or opening of the insulation ring 4 based on the rise or fall of the output end of the lifting mechanism.

[0042] It is important to understand that the thermal field assembly includes a guide tube 1, a lower insulation cover 3, and a lifting mechanism. The lower insulation cover 3 is ring-shaped, and the guide tube 1 is located within the inner ring of the lower insulation cover 3. One end of the lifting mechanism extends out of the furnace cover of the single crystal furnace, and the lifting mechanism can be used to drive the guide tube 1 to move up and down relative to the insulation ring 4. During the temperature adjustment, welding, crystal pulling, and equal diameter stages after the melting is completed, when the lifting mechanism drives the guide tube 1 to the lower limit, the upper end of the guide tube 1 is in contact with the upper end of the lower insulation cover 3. At this time, there is no gap 7 between the guide tube 1 and the lower insulation cover 3, meaning that the lower insulation cover 3 can keep the guide tube 1 warm. When melting and re-melting are required, the lifting mechanism drives the guide tube 1 to the upper limit to increase the amount of material fed. The upper part of the guide tube 1 extends out of the inner ring of the lower insulation cover 3, resulting in a gap 7 between the outer wall of the guide tube 1 and the upper end of the lower insulation cover 3.

[0043] The thermal field assembly includes a heat-insulating ring 4, the inner cavity of which is adapted to the guide tube 1. The heat-insulating ring 4 is formed by at least two heat-insulating units 41. The number of heat-insulating units 41 can be two, three, four, or other numbers, which is not limited in this application. The length of each heat-insulating unit 41 can be equal or unequal, which is also not limited in this application. The heat-insulating ring 4 can be used to surround the outer periphery of the guide tube 1, thereby insulating the guide tube 1. At the same time, the heat-insulating ring 4 can also seal the gap 7 between the guide tube 1 and the lower heat-insulating cover 3, reducing heat leakage and improving the heat insulation effect.

[0044] The thermal field assembly also includes a transmission mechanism 5, which connects the lifting mechanism and the insulation unit 41. Each insulation unit 41 is equipped with a corresponding transmission mechanism 5. The movement of the insulation unit 41 is controlled by the rising or falling of the output end of the lifting mechanism. The insulation unit 41 can be driven to move towards the guide tube 1, that is, multiple insulation units 41 close together to form an insulation ring 4, thereby sealing the gap 7 between the guide tube 1 and the lower insulation cover 3, reducing heat leakage and improving the insulation effect. The transmission mechanism 5 can also drive the insulation unit 41 away from the guide tube 1, so that the insulation ring 4 unfolds without affecting the guide tube 1 extending into the inner ring of the lower insulation cover 3. The inner diameter of the insulation ring 4 is adapted to the outer diameter of the guide tube 1 to be close to the outer diameter of the guide tube 1. The outer diameter of the insulation ring 4 is greater than or equal to the inner ring diameter of the lower insulation cover 3 so as to completely seal the gap 7.

[0045] Reference Figure 3 and Figure 4 In some optional embodiments, the transmission mechanism 5 controls the insulation ring 4 to close based on the upward movement of the output end of the lifting mechanism, so that in the first state, the guide tube 1 is located at the upper limit position and the insulation ring 4 seals the gap 7 between the guide tube 1 and the lower insulation cover 3; the transmission mechanism 5 controls the insulation ring 4 to unfold based on the downward movement of the output end of the lifting mechanism, so that in the second state, the guide tube 1 is located at the lower limit position, the insulation ring 4 unfolds, and the guide tube 1 overlaps the inner ring of the lower insulation cover 3.

[0046] That is, when the lifting mechanism drives the guide tube 1 to move upward, the lifting mechanism also drives the transmission mechanism 5 to drive the insulation ring 4 to close, so that the insulation ring 4 seals the gap 7 between the guide tube 1 and the lower insulation cover 3, reducing heat leakage and improving the insulation effect; when the lifting mechanism drives the guide tube 1 to move downward, the lifting mechanism also drives the transmission mechanism 5 to drive the insulation ring 4 to unfold, so that the insulation ring 4 does not affect the descent of the guide tube 1 into the inner ring of the lower insulation cover 3.

[0047] This application directly uses the lifting mechanism as the power source of the transmission mechanism 5, so that no additional power source is required, which can reduce the driving cost.

[0048] Reference Figures 3-4 In some optional embodiments, the thermal field assembly further includes a water-cooled screen 2, which includes a vertical rod 22 connected to the output end of the lifting mechanism, a horizontal rod 23 vertically connected to the vertical rod 22, and a screen body 24 connected to the horizontal rod 23, wherein the guide tube 1 is suspended on the horizontal rod 23, and the transmission mechanism 5 is connected to the horizontal rod 23.

[0049] The vertical rod 22 of the water-cooled screen 2 is connected to the lifting mechanism. When the lifting mechanism moves up and down, the vertical rod 22 moves up and down. The vertical rod 22 is connected to one end of the horizontal rod 23 along its length. When the vertical rod 22 moves up and down, it drives the horizontal rod 23 to move up and down. The horizontal rod 23 is set perpendicular to the vertical rod 22. The horizontal rod 23 is fixed with a hanging plate. The guide tube 1 is suspended by a suspension rod (such as...). Figure 9 (As shown) The screen 23 is suspended in the opening of the hanging plate. When the crossbar 23 rises or falls, it drives the guide tube 1 to rise or fall. The other end of the crossbar 23 along its length is connected to the screen body 24, which extends into the guide tube 1. The crossbar 23 is also connected to the transmission mechanism 5. When the crossbar 23 rises or falls, it drives the transmission mechanism 5 to move, thereby controlling the closing and unfolding of the insulation ring 4. The guide tube 1 and the transmission mechanism 5 are both connected to the crossbar 23. Through the crossbar 23 of the water-cooled screen 2, the action of the transmission mechanism 5 driving the insulation ring 4 to close and unfold can be linked with the rising and falling of the guide tube 1. When the guide tube 1 rises, the insulation ring 4 closes; when the guide tube 1 falls, the insulation ring 4 unfolds.

[0050] Reference Figures 3-8 , Figure 5 This diagram shows a schematic representation of the transmission mechanism and insulation unit provided in an embodiment of this application. Figure 6 This illustration shows a cross-sectional view of a transmission mechanism and a heat preservation unit provided in an embodiment of this application. Figure 7 This diagram illustrates a rotating ring structure according to an embodiment of this application. Figure 8 This is a cross-sectional view of a rotating ring and a threaded section provided in an embodiment of this application.

[0051] In some optional embodiments, the transmission mechanism 5 includes a transmission rod 51, a transmission gear 52, and a transmission rack 53; the transmission rod 51 extends longitudinally, with its upper end rotatably connected to the crossbar 23 and its lower end rotatably connected to the lower insulation cover 3, wherein the transmission rod 51 rotates at least when the lifting mechanism drives the crossbar 23 to rise or fall; the transmission gear 52 is sleeved on the transmission rod 51 and can rotate synchronously with the transmission rod 51; the transmission rack 53 extends laterally, with one end meshing with the transmission gear 52 and the other end driving the insulation ring 4 to close or unfold when the transmission gear 52 rotates.

[0052] The transmission mechanism 5 includes a transmission rod 51, which is arranged parallel to the vertical rod 22. The transmission rod 51 is rotatably connected to the horizontal rod 23. When the water-cooled screen 2 moves up and down, the transmission rod 51 rotates. The end of the transmission rod 51 facing the lower insulation cover 3 is rotatably connected to the lower insulation cover 3. At the same time, the lower end of the transmission rod 51 is also connected to a transmission gear 52. The transmission gear 52 is a spur gear and is sleeved on the transmission rod 51. When the transmission rod 51 rotates, the transmission gear 52 rotates synchronously. The transmission gear 52 also meshes with a transmission rack 53. When the transmission gear 52 rotates, the transmission rack 53 moves along the length of the horizontal rod 23. The transmission rack 53 is used to connect with the insulation unit 41. When the transmission rack 53 moves, it drives the insulation unit 41 to move, thereby controlling the closing and opening of the insulation ring 4.

[0053] In the first state, when the water-cooled screen 2 moves the guide tube 1 upward to its upper limit, the upward movement of the water-cooled screen 2 also causes the transmission rod 51 to rotate, which in turn causes the transmission gear 52 to rotate. The rotation of the transmission gear 52 causes the transmission rack 53 to move in the direction of the guide tube 1, and at the same time drives the heat preservation unit 41 to move in the direction of the guide tube 1 to form a heat preservation ring 4. This heat preservation ring 4 seals the gap 7 between the guide tube 1 and the lower heat preservation cover 3, and also insulates the guide tube 1. In the second state, the water-cooled screen 2 moves downward, causing the guide tube 1 to move downward. At the same time, the downward movement of the water-cooled screen 2 also causes the transmission rod 51 to rotate, which in turn causes the transmission gear 52 to rotate. The rotation of the transmission gear 52 causes the transmission rack 53 to move away from the direction of the guide tube 1, and at the same time drives the heat preservation unit 41 to move away from the direction of the guide tube 1, so that the heat preservation ring 4 unfolds without affecting the guide tube 1's insertion into the inner ring of the lower heat preservation cover 3.

[0054] Reference Figures 2-9 , Figure 9 This illustration shows a structural diagram of a water-cooled screen and a guide tube according to an embodiment of this application. In some optional embodiments, the transmission rod 51 includes at least a threaded section 511 with external threads. A rotating ring 21 is provided at the water-cooled screen 2, and the rotating ring 21 is sleeved on the transmission rod 51. The inner wall of the rotating ring 21 is provided with protrusions 211 for engaging the threaded section 511. The rotating ring 21 is fixed to the mounting plate of the water-cooled screen 2 by welding. The inner wall of the rotating ring 21 has protrusions 211. The number of protrusions 211 can be one, two, or three, etc., and this application does not limit the number. In one example, there are two protrusions 211 arranged opposite each other, and the two protrusions 211 are staggered vertically to engage with the threads, thereby improving the stability of the engagement between the rotating ring 21 and the threaded section 511. When the water-cooled screen 2 rises or falls, the rotating ring 21 also rises or falls accordingly, and the protrusions 211 engage with the threads in the threaded section 511, thereby driving the transmission rod 51 to rotate.

[0055] In some optional embodiments, the transmission rod 51 further includes a first smooth section 512 and a second smooth section 513, with a threaded section 511 located between the first smooth section 512 and the second smooth section 513. The first smooth section 512 is located above the threaded section 511. When the first smooth section 512 is located in the rotating ring 21, the lifting and lowering of the water-cooled screen 2 will not cause the transmission rod 51 to rotate, thus preventing the insulation unit 41 from getting too close to the guide tube 1. The second smooth section 513 is located below the threaded section 511. When the second smooth section 513 is located in the rotating ring 21, the lifting and lowering of the water-cooled screen 2 will not cause the transmission rod 51 to rotate, thus preventing the insulation unit 41 from getting too far away from the guide tube 1.

[0056] In some alternative embodiments, the second smooth section 513 is rotatably connected to the lower insulation cover 3 via a bearing 6. The bearing 6 improves the smoothness of rotation between the transmission rod 51 and the lower insulation cover 3.

[0057] In some optional embodiments, the transmission mechanism 5 further includes an elastic component, one end of which is connected to the insulation ring 4, and the other end is used to connect to the transmission rack 53. The elastic component can be a spring or other elastic material, and this application is not limited thereto. The provision of the elastic component can improve the fit between the insulation ring 4 and the guide tube 1, improve the insulation effect of the guide tube 1, and also increase the shielding effect on the gap 7 between the guide tube 1 and the lower insulation cover 3.

[0058] In some optional embodiments, the elastic component further includes an elastic element 54, a connecting cylinder 55, and a connecting rod 56; the connecting cylinder 55 has a closed end and an open end, the closed end being connected to the transmission rack 53; one end of the connecting rod 56 is connected to the insulation ring 4, and the other end extends into the connecting cylinder 55 from the open end; the elastic element 54 is sleeved on the connecting rod 56, one end of the elastic element 54 is connected to the connecting rod 56 or one end of the insulation ring 4, and the other end of the elastic element 54 is connected to the interior of the closed end of the connecting cylinder 55. The elastic element 54 is a spring, and the arrangement of the connecting cylinder 55 and the connecting rod 56 forms a telescopic rod. The elastic element 54 can control the extension and retraction of the connecting cylinder 55 and the connecting rod 56, and the connecting cylinder 55 and the connecting rod 56 can control the direction of extension and retraction of the elastic element 54 to prevent the elastic element 54 from tilting during the extension and retraction process.

[0059] Reference Figures 1-4 In some optional embodiments, the insulation unit 41 is an arc-shaped segment. In one embodiment, the insulation ring 4 may include two insulation units 41, and the insulation unit 41 is semi-circular. Two transmission mechanisms 5 are also provided and connected to the two insulation units 41 respectively. The threaded sections 511 of the two transmission rods 51 are arranged in opposite directions of rotation. The arc-shaped segment design of the insulation unit 41 allows it to form a ring, which is more suitable for the guide tube 1. The opposite arrangement of the threaded sections 511 of the two transmission rods 51 allows them to drive the two insulation units 41 to move simultaneously toward or away from the guide tube 1.

[0060] In some optional embodiments, the insulation unit 41 includes an insulation part and a support part, the support part being made of a rigid material and wrapping around the insulation part. The insulation part is made of insulation felt to improve its insulation performance, and the support part is wrapped with carbon fiber material to improve its support and the wear resistance of the insulation ring 4.

[0061] Reference Figures 1-8 This application also includes a single crystal furnace apparatus, comprising a thermal field assembly as described in any of the preceding claims.

[0062] The thermal field assembly includes a flow guide tube 1, a lower insulation cover 3, and a lifting mechanism that drives the flow guide tube 1 through the inner ring of the lower insulation cover 3 and can move up and down relative to the lower insulation cover 3. The thermal field assembly also includes an insulation ring 4 and a transmission mechanism 5. The insulation ring 4 is located at the lower insulation cover 3 and includes at least two insulation units 41 for surrounding the flow guide tube 1 so that the insulation ring 4 can be closed or opened. The transmission mechanism 5 connects the lifting mechanism and the insulation units 41 and controls the closure or opening of the insulation ring 4 based on the rise or fall of the output end of the lifting mechanism.

[0063] In the first state, during the melting and re-addition of materials, the lifting mechanism drives the guide cylinder 1 upward, and simultaneously drives the transmission mechanism 5 to close the insulation ring 4, thus sealing the gap 7 between the guide cylinder 1 and the lower insulation cover 3, reducing heat leakage and improving the insulation effect. In the second state, during the temperature adjustment, welding, crystal pulling, and equal diameter stages after the melting is completed, when the lifting mechanism drives the guide cylinder 1 downward, it also drives the transmission mechanism 5 to unfold the insulation ring 4, ensuring that the insulation ring 4 does not affect the descent of the guide cylinder 1 into the inner ring of the lower insulation cover 3.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A thermal field assembly, comprising a flow guide tube (1), a lower insulation cover (3), and a lifting mechanism for driving the flow guide tube (1) through an inner ring of the lower insulation cover (3) and movable vertically relative to the lower insulation cover (3), characterized in that, The thermal field assembly also includes: The heat insulation ring (4) is located at the lower heat insulation cover (3), and the heat insulation ring (4) includes at least two heat insulation units (41) for surrounding the guide tube (1) so that the heat insulation ring (4) can be closed or unfolded. The transmission mechanism (5) connects the lifting mechanism and the heat preservation unit (41) and controls the closing or opening of the heat preservation ring (4) based on the rising or falling of the output end of the lifting mechanism.

2. The thermal field assembly according to claim 1, characterized in that, The transmission mechanism (5) controls the heat preservation ring (4) to close based on the upward movement of the output end of the lifting mechanism, so that in the first state, the guide tube (1) is located at the upper limit position, and the heat preservation ring (4) seals the gap (7) between the guide tube (1) and the lower heat preservation cover (3); The transmission mechanism (5) controls the descent of the output end of the lifting mechanism to unfold the heat preservation ring (4), so that in the second state, the guide tube (1) is located at the lower limit position, the heat preservation ring (4) is unfolded, and the guide tube (1) overlaps the inner ring of the lower heat preservation cover (3).

3. The thermal field assembly according to claim 1, characterized in that, The thermal field assembly also includes a water-cooled screen (2), which includes a vertical rod (22) connected to the output end of the lifting mechanism, a horizontal rod (23) vertically connected to the vertical rod (22), and a screen body (24) connected to the horizontal rod (23). The guide tube (1) is suspended on the horizontal rod (23), and the transmission mechanism (5) is connected to the horizontal rod (23).

4. The thermal field assembly according to claim 3, characterized in that, The transmission mechanism (5) includes: The transmission rod (51) extends longitudinally, with its upper end rotatably connected to the crossbar (23) and its lower end rotatably connected to the lower insulation cover (3), wherein when the lifting mechanism drives the crossbar (23) to rise or fall, the transmission rod (51) rotates at least. A transmission gear (52) is sleeved on the transmission rod (51) and can rotate synchronously with the transmission rod (51); The transmission rack (53) extends laterally and one end meshes with the transmission gear (52), while the other end drives the insulation ring (4) to close or open when the transmission gear (52) rotates.

5. The thermal field assembly according to claim 4, characterized in that, The transmission rod (51) includes at least a threaded section (511) with external threads. A rotating ring (21) is provided at the water-cooled screen (2). The rotating ring (21) is sleeved on the transmission rod (51). The inner wall of the rotating ring (21) is provided with a protrusion (211) for engaging the threaded section (511).

6. The thermal field assembly according to claim 5, characterized in that, The transmission rod (51) also includes a first smooth section (512) and a second smooth section (513), and the threaded section (511) is located between the first smooth section (512) and the second smooth section (513).

7. The thermal field assembly according to claim 4, characterized in that, It also includes an elastic component, one end of which is connected to the insulation ring (4) and the other end of which is connected to the transmission rack (53).

8. The thermal field assembly according to claim 7, characterized in that, The elastic component includes: a connecting cylinder (55) having a closed end and an open end, the closed end being connected to the transmission rack (53); The connecting rod (56) is connected at one end to the heat insulation ring (4) and at the other end extends into the connecting cylinder (55) from the open end; An elastic element (54) is sleeved on the connecting rod (56). One end of the elastic element (54) is connected to the connecting rod (56) or one end of the insulation ring (4). The other end of the elastic element (54) is connected to the inside of the closed end of the connecting cylinder (55).

9. The thermal field assembly according to claim 5, characterized in that, The heat preservation unit (41) is an arc segment and there are two of them; the transmission mechanism (5) is also provided in two and is respectively connected to the two heat preservation units (41), and the threaded segments (511) of the two transmission rods (51) are arranged in opposite directions of rotation.

10. A single crystal furnace, characterized in that, Includes the thermal field assembly as described in any one of claims 1-9.

Images