A vacuum auxiliary device

Abstract

This application discloses a vacuum assist device comprising a distribution ring and an air tube of a preset length. A cover plate is secured to the first surface of the distribution ring, and the second surface of the distribution ring is secured to the vacuum device. A preset number of through-holes are defined on the side of the distribution ring, each of which is connected to the first end of a air tube. The second end of the air tube can extend upward to a target vacuum position. This vacuum assist device can assist in vacuuming the mold from above, reducing the number of microbubbles on the straight wall of the crucible, improving the microbubble situation at the upper end of the crucible, and thus enhancing the quality of the crucible.

Description

Technical Field

[0001] The invention belongs to the technical field of crucible manufacturing, and in particular relates to a vacuum auxiliary device. Background Art

[0002] Quartz crucibles can be used to draw large-diameter single crystal silicon, an essential device for producing solar cells and developing large-scale integrated circuits in the photovoltaic industry. With technological advancements, the diameter of quartz crucibles has increased. The production process for melting quartz sand is as follows: quartz sand → mold filling → arc melting → demolding → cooling (air cooling). Currently, quartz crucibles are typically produced using arc melting. Granular quartz sand is melted in a mold and then formed into a quartz crucible of a specific size and shape. The granular quartz sand is loaded into a steel mold. During the filling process, the mold interior is vacuumed. This ensures better adhesion of the sand to the mold walls and removes air trapped in the sand gaps, reducing the number of bubbles formed during melting. Vacuuming is maintained for the first few minutes of arc melting, until the sand inside the crucible has melted and formed into a glassy state. In the existing vacuuming process, air is extracted from the bottom, and the sand layer in the steel mold is evacuated through the air holes on the inner liner mold. In this way, the direction of gas flow starts from the bottom and is finally drawn to the upper port of the mold. In this case, the vacuuming effect at the upper end of the crucible is relatively poor compared to the lower end, resulting in far more microbubbles on the straight wall of the produced crucible than those at the bottom. However, the microbubbles at the bottom have almost no obvious effect on the use of the crucible, while the microbubbles at the upper port of the crucible have a greater impact on use. Therefore, one of the urgent problems to be solved is how to improve the microbubble situation at the upper port of the crucible. Summary of the Invention

[0003] To solve the above problems, the present invention provides a vacuum auxiliary device that can assist in vacuuming from above the mold, reduce the number of microbubbles on the straight wall of the crucible, improve the microbubble situation at the upper port of the crucible, and improve the quality of the crucible.

[0004] The present invention provides a vacuum auxiliary device, including a distribution ring and an air pipe with a preset length. A cover plate is fixed to the first surface of the distribution ring, and the second surface of the distribution ring is fixed to the vacuum device. A preset number of through holes are opened on the side of the distribution ring, and each of the through holes is connected to a first end of the air pipe. The second end of the air pipe can extend upward to the target vacuum position.

[0005] Preferably, in the above vacuum auxiliary device, the distribution ring and the cover plate are welded together.

[0006] Preferably, in the above vacuum auxiliary device, the distribution ring and the air pipe are welded together.

[0007] Preferably, in the above-mentioned vacuum assist device, the diameter of the trachea ranges from 10 mm to 20 mm.

[0008] Preferably, in the above vacuum auxiliary device, the preset number of through holes on the distribution ring is 6 to 24.

[0009] Preferably, in the above vacuum auxiliary device, the preset number of through holes on the distribution ring is 8 to 12.

[0010] Preferably, in the above vacuum auxiliary device, the through holes on the distribution ring are arranged at equal intervals.

[0011] Preferably, in the above-mentioned vacuum auxiliary device, the length of the air tube ranges from 500 mm to 1500 mm.

[0012] Preferably, in the above-mentioned vacuum assist device, the thickness of the air tube ranges from 2 mm to 5 mm.

[0013] Preferably, in the above vacuum auxiliary device, the thickness of the distribution ring ranges from 8 mm to 15 mm.

[0014] From the above description, it can be seen that the above-mentioned vacuum auxiliary device provided by the present invention includes a distribution ring and an air pipe with a preset length. The first surface of the distribution ring is fixed with a cover plate, the second surface of the distribution ring is fixed to the vacuum device, and the side of the distribution ring is provided with a preset number of through holes, each of the through holes is connected to a first end of the air pipe, and the second end of the air pipe can extend upward to the target vacuum position, so it can assist in vacuuming from above the mold, thereby reducing the number of microbubbles on the straight wall of the crucible, improving the microbubble situation at the upper port of the crucible, and improving the quality of the crucible. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0016] Figure 1 A schematic diagram of an embodiment of a vacuum auxiliary device provided by the present invention;

[0017] Figure 2 This is a cross-sectional diagram of the vacuum assist device in actual operation. DETAILED DESCRIPTION

[0018] The core of the present invention is to provide a vacuum auxiliary device that can assist in vacuuming from above the mold, reduce the number of microbubbles on the straight wall of the crucible, improve the microbubble situation at the upper port of the crucible, and improve the quality of the crucible.

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] An embodiment of a vacuum auxiliary device provided by the present invention is as follows: Figure 1 As shown, Figure 1 This is a schematic diagram of an embodiment of a vacuum assist device provided by the present invention, which may include a distribution ring 1 and an air pipe 2 with a preset length. A cover plate 3 is fixed to the first surface of the distribution ring 1, and the second surface of the distribution ring 1 is fixed to the vacuum device. A preset number of through holes are opened on the side of the distribution ring 1, and each through hole is connected to the first end of the air pipe 2. The second end of the air pipe 2 can extend upward to the target vacuum position.

[0021] It should be noted that the distribution ring 1 and the cover plate 3 must be airtight to avoid leakage from the connection between the two. Figure 1 As can be seen in the figure, the second surface of the distribution ring 1 is its bottom surface. After its bottom surface is airtightly connected to the tube body of the vacuum device, the entire vacuum path can be determined as: vacuum device → second surface of the distribution ring → distribution ring → through hole → air pipe → second end of air pipe → target vacuum position. By using this vacuum auxiliary device, the direct vacuum position can be transferred from the original bottom of the crucible to the top of the crucible. Figure 2 , Figure 2 This is a cross-sectional diagram of the actual working of the vacuum assist device. It can be seen that the above-mentioned vacuum assist device is installed between the outer water-cooling mold 4 and the inner liner steel mold 5, the distribution ring 1 is welded to the outer water-cooling mold 4, and the vacuum hole at the bottom of the outer water-cooling mold 4 is sealed with the distribution ring 1, so that the direct vacuum position is changed from the previous bottom to the opening of the vacuum tube, that is, the upper port position of the inner liner steel mold 5. The lower part of the distribution ring 1 is connected to the vacuum device, and all the air pipes extend upward to the top of the crucible, so that the air flow is extracted from above, so that the vacuum effect on the upper part of the crucible is better, thereby reducing the number of microbubbles on the straight wall of the crucible, improving the microbubble situation at the upper port of the crucible, and improving the quality of the crucible.

[0022] From the above description, it can be seen that in the embodiment of the above-mentioned vacuum auxiliary device provided by the present invention, since it includes a distribution ring and an air pipe with a preset length, the first surface of the distribution ring is fixed with a cover plate, the second surface of the distribution ring is fixed to the vacuum device, and a preset number of through holes are opened on the side of the distribution ring, each through hole is connected to a first end of an air pipe, and the second end of the air pipe can extend upward to the target vacuum position, so it can assist in vacuuming from above the mold, thereby reducing the number of microbubbles on the straight wall of the crucible produced, improving the microbubble situation at the upper port of the crucible, and improving the quality of the crucible.

[0023] In a specific embodiment of the above-mentioned vacuum auxiliary device, the distribution ring 1 and the cover plate 3 can preferably be welded together, so that the connection between the two is tighter and stronger, and gas leakage from here is better avoided, thereby ensuring better air tightness in the entire gas passage. Of course, other fixing methods can also be selected according to actual needs, which is not limited here.

[0024] In another specific embodiment of the above-mentioned vacuum auxiliary device, the distribution ring 1 and the air pipe 2 can preferably be welded together. In this case, the fixation between the distribution ring 1 and the air pipe 2 is tighter, and the air tightness can also be better guaranteed, ensuring a better vacuum effect. Of course, other methods can also be selected according to actual needs, which is not limited here.

[0025] In another specific embodiment of the above-mentioned vacuum auxiliary device, the diameter range of the air pipe can be preferably 10mm to 20mm. This diameter can ensure that the gas flow rate meets the vacuum requirements, and can ensure that the air pipe is placed in the gap between the outer water-cooling mold 4 and the inner liner steel mold 5, and will not affect the installation of the inner liner steel mold 5, so as not to cause extrusion between the inner liner steel mold 5 and the outer water-cooling mold 4. Of course, the diameter can also be adaptively adjusted according to actual needs, which is not limited here. Furthermore, the preset number of through holes on the above-mentioned distribution ring 1 can be preferably 6 to 24. Furthermore, the preset number of through holes on the distribution ring is 8 to 12. This number can not only ensure the effective distribution of the air pipe, so that the vacuum effect meets the use requirements, but also reduce the difficulty of production. Moreover, the through holes on the distribution ring are preferably arranged at equal intervals. This symmetrical distribution of through holes can ensure that the force in all directions during the vacuum process is more uniform, ensuring a better vacuum effect.

[0026] In a preferred embodiment of the above-mentioned vacuum auxiliary device, the length range of the air tube 2 can be preferably 500mm to 1500mm. Of course, this can be selected according to the actual height of the crucible. When the crucible is higher, the length of the corresponding air tube 2 will be longer, and vice versa, as long as it can ensure that the free end of the air tube can be located at the desired position. The distance between the top of the air tube 2 and the lower edge of the port of the inner liner steel mold 5 is preferably 100mm to 300mm, which can effectively ensure the vacuum efficiency of the upper end of the steel mold. If it is greater than 300mm, the vacuum position will be lower, the utilization rate of the upper vacuum hole will be low, and the vacuum efficiency will not be significantly improved; if it is less than 100mm, the vacuum position will be higher than the vacuum eye position of the steel mold, resulting in a low utilization rate of the vacuum hole at the upper part of the steel mold, which will also affect the vacuum efficiency. In addition, the thickness range of the above-mentioned air tube 2 can be preferably 2mm to 5mm, which can ensure sufficiently high strength to avoid bursting, and the cost is low.

[0027] In another preferred embodiment of the above-mentioned vacuum auxiliary device, the thickness range of the distribution ring 1 can preferably be 8 mm to 15 mm. Such a thickness can ensure that the strength of the distribution ring 1 itself is high enough, and that the connection between it and the air pipe and the cover plate is strong enough, thereby extending its service life. Of course, the thickness can also be adjusted according to actual needs, which is not limited here.

[0028] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vacuum auxiliary device, characterized in that: The invention comprises a distribution ring and an air pipe of a preset length, wherein a cover plate is fixed to a first surface of the distribution ring, and a vacuum pumping device is fixed to a second surface of the distribution ring. A preset number of through holes are opened on the side of the distribution ring, each of which is connected to a first end of the air pipe, and the second end of the air pipe can extend upward to a target vacuum pumping position. All the air pipes extend upward to the top of the crucible, and the air flow is extracted from the top of the crucible, and the direct vacuum pumping position is transferred to the top of the crucible, that is, the upper end position of the inner liner steel mold; The length of the air pipe ranges from 500 mm to 1500 mm, and the distance between the top end of the air pipe and the lower edge of the port of the inner liner steel mold is from 100 mm to 300 mm.

2. The vacuum auxiliary device according to claim 1, characterized in that: The distribution ring is welded to the cover plate.

3. The vacuum auxiliary device according to claim 1, characterized in that: The distribution ring is welded to the air pipe.

4. The vacuum auxiliary device according to claim 1, characterized in that: The diameter of the trachea ranges from 10 mm to 20 mm.

5. The vacuum auxiliary device according to claim 1, characterized in that: The preset number of through holes on the distribution ring is 6 to 24.

6. The vacuum auxiliary device according to claim 5, characterized in that: The preset number of through holes on the distribution ring is 8 to 12.

7. The vacuum auxiliary device according to claim 1, characterized in that: The through holes on the distribution ring are arranged at equal intervals.

8. The vacuum assist device according to claim 1, wherein: The thickness of the trachea ranges from 2 mm to 5 mm.

9. The vacuum assist device according to claim 1, wherein: The thickness of the distribution ring ranges from 8 mm to 15 mm.

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