Oxygen-reduction heat-preservation cylinder

Abstract

The utility model relates to the technical field of single crystal furnace equipment, in particular to an oxygen reduction heat preservation cylinder which comprises a cylinder body, a plurality of flow guide channels are distributed on the inner wall of the cylinder body in the circumferential direction, and necking openings with the sizes gradually reduced are formed in the upper ends of the flow guide channels; the inner wall of the cylinder body of the oxygen-reduction heat-preservation cylinder is provided with a plurality of flow guide channels, the upper ends of the flow guide channels are provided with the necked openings, when airflow flows to the necked openings from top to bottom, airflow passing can be accelerated due to the fact that the channels are narrowed, and therefore oxygen released by a crucible can be taken away in an accelerated mode. And meanwhile, heat at the bottom of the crucible can be reduced, so that oxygen release of the crucible is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of single crystal furnace equipment, in particular to an oxygen-reducing heat preservation cylinder. Background Art

[0002] Oxygen is one of the main non-metallic impurities in single crystal silicon. The oxygen in the crystal mainly comes from the dissolution of the quartz crucible during the crystal pulling process. Among them, 99% of the oxygen volatilizes from the melt surface in the form of SiO and is carried away by the argon gas flow, and the rest enters the crystal.

[0003] Chinese Patent CN219635749U discloses a heat preservation cylinder, in which an oxygen-reducing ring protrusion is integrally formed on the inner wall of the cylinder. However, in this design, the air flow still flows slowly along the inner wall of the cylinder, which is not conducive to oxygen reduction. Summary of the Utility Model

[0004] To achieve the above object, the utility model provides an oxygen-reducing heat preservation cylinder, which includes a cylinder body. A plurality of guiding channels are distributed along the circumference of the inner wall of the cylinder body, and a reduced opening with gradually decreasing size is provided at the upper end of the guiding channel.

[0005] In some embodiments, a plurality of guiding strips protrude from the inner wall of the cylinder body, and the guiding channels are formed between adjacent two guiding strips.

[0006] In some embodiments, the guiding strips are integrally formed with the cylinder body.

[0007] In some embodiments, the guiding strip includes an inclined section and a vertical section arranged from top to bottom. The reduced opening with gradually decreasing size is formed between the inclined section and another inclined section adjacent to one side of it, and the end of the inclined section is connected to the end of another inclined section adjacent to the other side of it.

[0008] In some embodiments, a heat preservation cover is arranged at the upper end of the cylinder body, and a first rounded structure is formed at the connection between the heat preservation cover and the upper end of the cylinder body.

[0009] In some embodiments, an oxygen-reducing ring protruding inwards is arranged in the middle of the cylinder body, and a second rounded structure smoothly connected to the inner wall of the cylinder body is formed at the upper end and / or the lower end of the oxygen-reducing ring.

[0010] In some embodiments, a plurality of semicircular guiding holes distributed along the circumference are formed in the oxygen-reducing ring.

[0011] In some embodiments, the cylinder body includes a first cylinder part, a second cylinder part and a third cylinder part arranged in sequence from top to bottom. The heat preservation cover overlaps on the upper end of the first cylinder part, and the oxygen-reducing ring is arranged between the second cylinder part and the third cylinder part.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: In the oxygen-reducing and heat-insulating cylinder of the present utility model, a number of flow guiding channels are provided on the inner wall of the cylinder body. A constriction is provided at the upper end of the flow guiding channel. When the air flow flows from top to bottom to the constriction, the air flow can be accelerated due to the narrowing of the channel. In this way, the oxygen released by the crucible can be taken away quickly, and at the same time, the heat at the bottom of the crucible can be reduced, thereby reducing the release of oxygen from the crucible. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0014] Figure 1 is the three-dimensional structural decomposition diagram of the oxygen-reducing and heat-insulating cylinder provided by the embodiment of the present utility model;

[0015] Figure 2 is the three-dimensional structural sectional view of the oxygen-reducing and heat-insulating cylinder provided by the embodiment of the present utility model;

[0016] Figure 3 is Figure 2 the enlarged schematic view of part A in

[0017] Figure 4 is Figure 2 the enlarged schematic view of part B in

[0018] Reference numerals: cylinder body 1, first cylinder part 11, second cylinder part 12, third cylinder part 13, flow guiding channel 2, constriction 3, flow guiding strip 4, inclined section 41, vertical section 42, heat-insulating cover 5, first rounded structure 51, oxygen-reducing ring 6, second rounded structure 61, semi-circular flow guiding hole 62. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model. Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise stated, the meaning of "a plurality" is two or more.

[0020] Reference Figures 1 to 3 Shown is a deoxidizing and heat-insulating cylinder, which includes a cylinder body 1. A plurality of guiding channels 2 are circumferentially distributed on the inner wall of the cylinder body 1. The guiding channels 2 extend vertically on the inner wall of the cylinder body 1. A reduced opening 3 with gradually decreasing dimensions is further provided at the upper end of the guiding channel 2. When the air flow flows downward along the inner wall of the cylinder body 1 and reaches the reduced opening 3, the air flow can be accelerated through the guiding channel 2 due to the narrowing of the flow path. Such a design can, on the one hand, accelerate the removal of oxygen released by the crucible, and on the other hand, reduce the heat at the bottom of the crucible, thereby reducing the release of oxygen on the crucible.

[0021] In some embodiments, a plurality of guiding strips 4 protrude from the inner wall of the cylinder body 1. The guiding strips 4 are integrally formed with the cylinder body 1. A guiding channel 2 is formed between two adjacent guiding strips 4. The air flow can flow through the guiding channel 2 at an accelerated speed. Further, the guiding strip 4 includes an inclined section 41 and a vertical section 42 arranged from top to bottom. Between two adjacent guiding strips 4, a reduced opening 3 is formed between two oppositely arranged inclined sections 41, and two vertical sections 42 connected to the two inclined sections 41 form the guiding channel 2. In addition, at the ends of two oppositely arranged inclined sections 41 on two adjacent guiding strips 4 are joined together, so that the air flow flowing along the inner wall of the cylinder body 1 all passes through the reduced opening 3 and flows through the guiding channel 2 at an accelerated speed.

[0022] In some embodiments, a heat-insulating cover 5 is provided at the upper end of the cylinder body 1. A first rounded structure 51 is formed at the connection between the heat-insulating cover 5 and the upper end of the cylinder body 1. The purpose is to make the air flow flowing through this place not easily form a vortex, so that the air flow can smoothly pass through this place. Specifically, the first rounded structure 51 can be provided on the inner side of the heat-insulating cover 5. After the heat-insulating cover 5 is lapped or covered on the upper end of the cylinder body 1, the free end of the first rounded structure 51 is smoothly transitioned with the inner wall of the cylinder body 1.

[0023] In some embodiments, a deoxidizing ring 6 protruding inward is provided in the middle of the cylinder body 1. A second rounded structure 61 smoothly connected to the inner wall of the cylinder body 1 is formed at the upper end and / or the lower end of the deoxidizing ring 6. The purpose is that when the air flow flows through the deoxidizing ring 6, it is not easily formed into a vortex, so that the air flow can smoothly pass through the deoxidizing ring 6. Further, a plurality of semicircular guiding holes 62 are circumferentially distributed on the deoxidizing ring 6. The air flow can flow downward from the semicircular guiding holes 62.

[0024] In some embodiments, the cylinder body 1 includes a first cylinder part 11, a second cylinder part 12, and a third cylinder part 13 which are arranged in sequence from top to bottom. The heat preservation cover 5 is lapped on the upper end of the first cylinder part 11, and the first rounded structure 51 on the heat preservation cover 5 is smoothly connected to the inner wall of the first cylinder part 11. The oxygen reduction ring 6 is arranged between the second cylinder part 12 and the third cylinder part 13. The second rounded structure 61 located at the upper end of the oxygen reduction ring 6 is smoothly connected to the inner wall of the second cylinder part 12, and another second rounded structure 61 located at the lower end of the oxygen reduction ring 6 is smoothly connected to the inner wall of the third cylinder part 13.

[0025] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An oxygen reduction and heat preservation cylinder, characterized in that: The invention comprises a cylinder (1), wherein the inner wall of the cylinder (1) is provided with a plurality of guide channels (2) distributed along the circumferential direction, and the upper end of the guide channel (2) is provided with a gradually decreasing necking (3); the inner wall of the cylinder (1) is provided with a plurality of guide strips (4), and the guide channel (2) is formed between two adjacent guide strips (4); the guide strip (4) comprises an inclined section (41) and a vertical section (42) arranged from top to bottom, and the gradually decreasing necking (3) is formed between the inclined section (41) and another inclined section (41) adjacent to one side thereof, and the end of the inclined section (41) is connected to the end of another inclined section (41) adjacent to the other side thereof.

2. The oxygen reduction heat preservation cylinder according to claim 1, characterized in that: The guide strip (4) and the cylinder (1) are integrally formed.

3. The oxygen reduction heat preservation cylinder according to claim 1, characterized in that: A heat-insulating cover (5) is provided at the upper end of the cylinder (1), and a first rounded structure (51) is formed at the connection between the heat-insulating cover (5) and the upper end of the cylinder (1).

4. The oxygen reduction heat preservation cylinder according to claim 3, characterized in that: An inwardly protruding oxygen reduction ring (6) is provided in the middle of the cylinder (1), and a second rounded structure (61) smoothly connected to the inner wall of the cylinder (1) is formed at the upper end and / or the lower end of the oxygen reduction ring (6).

5. The oxygen reduction heat preservation cylinder according to claim 4, characterized in that: The oxygen reduction ring (6) is provided with a plurality of semicircular flow guide holes (62) distributed along the circumferential direction.

6. The oxygen reduction heat preservation cylinder according to claim 4, characterized in that: The cylinder (1) comprises a first cylinder portion (11), a second cylinder portion (12) and a third cylinder portion (13) which are arranged in sequence from top to bottom; the heat-insulating cover (5) is overlapped on the upper end of the first cylinder portion (11); and the oxygen-reducing ring (6) is arranged between the second cylinder portion (12) and the third cylinder portion (13).

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