Spiral base cone feeder
By setting a spiral baffle on the bottom cone of the feeder, the flow direction of the particulate silicon is diverted and the flow direction of the particulate silicon is solved, and a more efficient feeding process is achieved.
Patent Information
- Application Number
- CN202420435938.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-03-06
AI Technical Summary
Granular silicon is prone to dust during the feeding process of furnace injection, which leads to difficulty in crystal drawing.
A spiral bottom cone feeder is designed. By setting a spiral baffle on the bottom cone, the flow diversion effect slows down the particle silicon and changes the flow direction so that it falls directly under the barrel to minimize argon. The air blowing effect reduces flying.
It effectively slows down the descent rate and scattered area of granular silicon, reduces the flying of granular silicon, and improves the feeding efficiency and quality.
Smart Images
Figure CN222226641U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of single crystal silicon production equipment, and more specifically, to a spiral bottom cone feeder. Background Art
[0002] The feeder is a device for adding silicon material to the quartz crucible. The feeder is mainly composed of a lifting rod, a barrel and a bottom cone. The lifting rod is movably arranged in the barrel, and the bottom of the lifting rod is connected to the bottom cone. The bottom cone and the barrel cooperate to form a cavity for filling silicon material. When used in the feeding process, the silicon material is first poured into the feeder, and then the feeder is lifted into the single crystal furnace, and the feeder is lowered to a fixed position. The lifting rod drives the bottom cone to descend, and the bottom cone and the barrel form a discharge port. When the silicon material is sprinkled into the quartz crucible, the feeding operation is completed. Granular silicon has obvious cost advantages and is increasingly used in the photovoltaic industry. However, due to the light weight of granular silicon, during the process of feeding into the furnace, the bottom cone descends and forms a discharge port with the barrel. The granular silicon is prone to flying during the descent process and adheres to the inner wall of the furnace, making the crystal pulling process difficult.
[0003] Therefore, there is an urgent need to provide a feeder that can prevent granular silicon from generating dust. Utility Model Content
[0004] In view of this, the utility model provides a spiral bottom cone feeder to reduce the problem of dust generated during the process of feeding granular silicon into a furnace.
[0005] The spiral bottom cone feeder provided by the utility model comprises a feeding barrel, the feeding barrel has a material placing space, a bottom cone for opening and closing the feeding barrel is arranged at the bottom of the feeding barrel, the bottom cone comprises a first surface and a second surface arranged oppositely, the first surface is a side of the bottom cone close to the top of the feeding barrel;
[0006] The bottom cone is provided with a spiral baffle protruding from the first surface, and the spiral baffle extends from the edge of the bottom cone to the center of the bottom cone.
[0007] Optionally, the spiral baffle includes an edge end and a center end, the edge end is an end of the spiral baffle close to the edge of the bottom cone, and the center end is an end of the spiral baffle close to the center of the bottom cone;
[0008] The height between the center end and the second surface is a, the height between the edge end and the second surface is b, and a>b.
[0009] Optionally, the width of the edge end along the first direction is smaller than the width of the center end along the first direction, the direction from the edge end to the center end is the second direction, and the first direction intersects with the second direction.
[0010] Optionally, the number of the spiral baffles is 3-7.
[0011] Optionally, the included angles of two adjacent spiral baffles are equal.
[0012] Optionally, the outer diameter of the bottom cone is greater than the outer diameter of the feeding barrel.
[0013] Optionally, in the direction from the top of the feeding barrel to the bottom of the feeding barrel, the orthographic projection of the spiral baffle is located within the orthographic projection of the material storage space.
[0014] Optionally, the outer wall of the feeding barrel further includes a guide cone on a side close to the bottom of the feeding barrel, and the guide cone protrudes from the outer wall of the feeding barrel.
[0015] Optionally, a limiting flange is also included, and the limiting flange is connected to the outer wall of the feeding barrel by bolts.
[0016] Optionally, it also includes a lifting rod and a support arm, wherein the support arm is connected to the top of the charging bucket;
[0017] The lifting rod is at least partially located in the material placement space, one end of which is fixedly connected to the center of the bottom cone, and the other end of which penetrates the support arm. The lifting rod moves along the extension direction of the feeding barrel.
[0018] Compared with the prior art, the spiral bottom cone feeder provided by the utility model achieves at least the following beneficial effects:
[0019] The utility model of the spiral bottom cone feeder includes a feeding barrel, the feeding barrel has a material placement space, the bottom of the feeding barrel is provided with a bottom cone for opening and closing the feeding barrel, the bottom cone includes a first surface and a second surface arranged oppositely, the first surface is the side of the bottom cone close to the top of the feeding barrel; the bottom cone is provided with a spiral baffle protruding from the first surface, and the spiral baffle extends from the edge of the bottom cone to the center of the bottom cone. Through the guiding effect of the spiral baffle, the falling speed of the granular silicon material is greatly slowed down, and at the same time, by changing the flow direction of the granular silicon material, the scattering area of the granular silicon material is further reduced, so that the granular silicon material falls directly below the barrel to the greatest extent, reducing the blowing effect of argon gas on the granular silicon and alleviating the flying of the granular silicon material.
[0020] Of course, any product implementing the present utility model does not necessarily need to achieve all of the above-mentioned technical effects at the same time.
[0021] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.
[0023] Figure 1 is a cross-sectional schematic diagram of a spiral bottom cone feeder provided in this embodiment;
[0024] Figure 2 is a schematic structural diagram of a bottom cone provided in this embodiment;
[0025] Figure 3 is a state diagram of a granular silicon material provided in this embodiment when passing through a bottom cone;
[0026] Figure 4 This is a schematic diagram of a spiral bottom cone feeder provided in this embodiment during the feeding process;
[0027] Figure 5 This is another schematic diagram of a spiral bottom cone feeder provided in this embodiment during the feeding process. DETAILED DESCRIPTION
[0028] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention.
[0029] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.
[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.
[0031] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.
[0032] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0033] Reference Figures 1 to 5 , Figure 1 is a cross-sectional schematic diagram of a spiral bottom cone feeder provided in this embodiment, Figure 2 is a schematic diagram of the structure of a bottom cone provided in this embodiment, Figure 3 is a state diagram of a granular silicon material provided in this embodiment when passing through a bottom cone, Figure 4 is a schematic diagram of a spiral bottom cone feeder provided in this embodiment during the feeding process, Figure 5 FIG. 1 is another schematic diagram of a spiral bottom cone feeder provided in this embodiment during the feeding process, as shown in FIG. Figures 1 to 5As shown, the spiral bottom cone feeder 100 provided in this embodiment includes a feeding barrel 2, the feeding barrel 2 has a material placement space, and a bottom cone 1 for opening and closing the feeding barrel 2 is provided at the bottom of the feeding barrel 2. The bottom cone 1 includes a first surface 11 and a second surface 12 that are arranged opposite to each other, and the first surface 11 is a side of the bottom cone 1 close to the top of the feeding barrel 2;
[0034] The bottom cone 1 is provided with a spiral baffle 101 protruding from the first surface 11 , and the spiral baffle 101 extends from the edge of the bottom cone 1 to the center of the bottom cone 1 .
[0035] Specifically, the feeding barrel 2 extends in the up and down directions, and the feeding barrel 2 is a hollow cylinder with a material storage space. A bottom cone 1 is provided at the bottom of the feeding barrel 2, and the movement of the bottom cone 1 in the up and down directions controls the opening and closing of the bottom of the feeding barrel 2. When the bottom cone 1 moves downward and there is a gap between the bottom cone 1 and the bottom of the feeding barrel 2, the feeding barrel 2 is opened. When there is no gap between the bottom cone 1 and the bottom of the feeding barrel 2 to achieve airtightness, the feeding barrel 2 is closed.
[0036] The bottom cone 1 is a cone, including a first surface 11 and a second surface 12 that are arranged opposite to each other. The first surface 11 is the side of the bottom cone 1 close to the top of the feeding barrel 2. The first surface 11 is an inclined surface, and the height of the center of the bottom cone 1 is greater than the height of the edge of the bottom cone 1, so that the first surface 11 forms an inclined surface, and the second surface 12 is a plane. The bottom cone 1 forms a cone as a whole. The bottom cone 1 is provided with a spiral baffle 101 protruding from the first surface 11. Optionally, the material of the spiral baffle 101 can be the same as that of the bottom cone 1. Of course, the spiral baffle 101 can also be made of a material with a higher hardness, which is not specifically limited here. Figure 2 and Figure 3 As shown, the spiral baffle 101 is similar to the blade of a propeller. The spiral baffle 101 has two arc-shaped side edges, one of which is close to the first surface 11 of the bottom cone 1, and the other arc-shaped side edge has a certain distance from the first surface 11 of the bottom cone 1. The spiral baffle 101 extends from the edge of the bottom cone 1 to the center of the bottom cone 1. One end of the spiral baffle 101 converges at the center of the bottom cone 1, and the other end is distributed at the edge of the bottom cone 1, so that there is a certain vortex space between two adjacent spiral baffles 101. This vortex space plays a role in guiding flow. When the granular silicon material 6 enters the vortex space, it will move along the extension direction of the spiral baffle 101, that is, it plays a role in guiding flow, changing the flow direction of the granular silicon material 6. Compared with the prior art, in which the granular silicon material falls directly along the inclined surface of the bottom cone, the falling speed of the granular silicon material 6 in this embodiment is greatly slowed down. At the same time, by changing the flow direction of the granular silicon material 6, the scattering area of the granular silicon material 6 is further reduced, so that the granular silicon material 6 falls to the greatest extent directly below the material barrel, reducing the blowing effect of the argon gas 7 on the granular silicon and alleviating the flying of the granular silicon material 6.
[0037] The working process of the spiral bottom cone feeder 100 of the present embodiment is as follows: the spiral bottom cone feeder 100 is placed vertically, with the top of the feeding barrel 2 at the top and the bottom at the bottom. Under the action of gravity, the feeding barrel 2 presses the bottom cone 1, keeping the bottom of the feeding barrel 2 sealed to prevent the silicon material from leaking out. At this time, the feeding barrel 2 is in a closed state. The granular silicon material 6 is poured into the material storage space of the feeding barrel 2 from the top opening of the feeding barrel 2, and the spiral bottom cone feeder 100 is lifted. At this time, under the action of gravity, the feeding barrel 2 remains pressed against the bottom cone 1. After the spiral bottom cone feeder 100 is lifted into the furnace table of the single crystal furnace, the spiral bottom cone feeder 100 is slowly lowered, and the bottom cone 1 begins to separate from the feeding barrel 2. The granular silicon material 6 begins to flow downward from the gap between the bottom cone 1 and the bottom of the feeding barrel 2 under the action of gravity, as shown in FIG. Figure 4 At this time, the granular silicon material 6 will slowly flow out in rotation under the guidance of the spiral baffle 101, as shown in FIG. Figure 3 As shown, the bottom cone 1 leaves the spiral bottom cone feeder 100 along the tangent direction of the outer circle of the bottom cone 1 and falls into the crucible in the furnace.
[0038] Compared with the prior art, the spiral bottom cone feeder 100 of this embodiment has at least the following beneficial effects:
[0039] The spiral bottom cone feeder 100 of this embodiment includes a feeding barrel 2, the feeding barrel 2 has a material placement space, and a bottom cone 1 for opening and closing the feeding barrel 2 is provided at the bottom of the feeding barrel 2. The bottom cone 1 includes a first surface 11 and a second surface 12 arranged opposite to each other, and the first surface 11 is the side of the bottom cone 1 close to the top of the feeding barrel 2; the bottom cone 1 is provided with a spiral baffle 101 protruding from the first surface 11, and the spiral baffle 101 extends from the edge of the bottom cone 1 to the center of the bottom cone 1. Through the guiding effect of the spiral baffle 101, the descending speed of the granular silicon material 6 is greatly slowed down. At the same time, by changing the flow direction of the granular silicon material 6, the scattering area of the granular silicon material 6 is further reduced, so that the granular silicon material 6 falls directly below the barrel to the greatest extent, reducing the blowing effect of the argon gas 7 on the granular silicon and alleviating the flying of the granular silicon material 6.
[0040] In some optional embodiments, continue to refer to Figures 1 to 5 The spiral baffle 101 includes an edge end 1011 and a center end 1012, wherein the edge end 1011 is an end of the spiral baffle 101 close to the edge of the bottom cone 1, and the center end 1012 is an end of the spiral baffle 101 close to the center of the bottom cone 1;
[0041] The height between the center end 1012 and the second surface 12 is a, and the height between the edge end 1011 and the second surface 12 is b, where a>b.
[0042] like Figure 2As shown, the height a of the center end 1012 of the spiral baffle 101 from the second surface 12 is greater than the height b of the edge end 1011 from the second surface 12. In this way, in the direction from the top of the feeding bucket 2 to the bottom of the feeding bucket 2, the center end 1012 of the spiral baffle 101 is higher than the edge end 1011 of the spiral baffle 101, so that there is a certain vortex space between two adjacent spiral baffles 101, and this vortex space plays a role of diversion. When the granular silicon material 6 enters the vortex space, it will move along the center end 1012 of the spiral baffle 101 toward the edge end 1011 of the spiral baffle 101, playing a role of diversion, changing the flow direction of the granular silicon material 6, and the descending speed of the granular silicon material 6 is greatly slowed down. At the same time, by changing the flow direction of the granular silicon material 6, the scattering area of the granular silicon material 6 is further reduced, so that the granular silicon material 6 falls to the maximum extent directly below the barrel, reducing the blowing effect of the argon gas 7 on the granular silicon, and alleviating the flying of the granular silicon material 6.
[0043] In some optional embodiments, continue to refer to Figure 2 and Figure 3 The width of the edge end 1011 along the first direction X is smaller than the width of the center end 1012 along the first direction X. The direction from the edge end 1011 to the center end 1012 is the second direction Y. The first direction X and the second direction Y intersect.
[0044] It can be understood that the first direction X is parallel to the radius direction of the bottom cone 1, and the second direction Y is the extension direction of the spiral baffle 101. Of course, the first direction X and the second direction Y are different for different spiral baffles 101, such as Figure 2 As shown, the first direction X and the second direction Y are for a single spiral baffle 101. Specifically, the spiral baffle 101 is a structure that is wide at the top and narrow at the bottom, such as Figure 2 and Figure 3 As shown, the closer the spiral baffle 101 is to the center of the bottom cone 1, the larger the width of the spiral baffle 101 is, and the closer the spiral baffle 101 is to the edge of the bottom cone 1, the smaller the width of the spiral baffle 101 is. Optionally, the width of the spiral baffle 101 gradually decreases in the direction from the center of the bottom cone 1 to the edge of the bottom cone 1.
[0045] The width of the edge end 1011 along the first direction X is smaller than the width of the center end 1012 along the first direction X. The vortex space formed between two adjacent spiral baffles 101 is a space that is narrow at the top and wide at the bottom. The center end 1012 of the spiral baffle 101 can reduce the amount of granular silicon material 6 entering the vortex space, and the descending speed of the granular silicon material 6 is greatly slowed down.
[0046] In some optional embodiments, continue to refer to Figure 2 and Figure 3, the number of the spiral baffles 101 is 3-7.
[0047] Figure 2 and Figure 3 In the figure, only 5 spiral baffles 101 are used as an example for schematic illustration. The number of spiral baffles 101 should not be too many or too few. Specifically, if the number of spiral baffles 101 is too few, the spacing between two adjacent spiral baffles 101 near the center of the bottom cone 1 will be large, and the vortex space formed between the two adjacent spiral baffles 101 is a narrow space at the top and wide space at the bottom. Of course, the narrow top of this vortex space is to limit the amount of granular silicon material 6 entering the vortex space, thereby reducing the speed of granular silicon material 6 falling. If the number of spiral baffles 101 is too few, the upper volume of the vortex space is relatively large, and the amount of granular silicon material 6 entering the vortex space is relatively large, which is not easy to play the role of reducing the speed of granular silicon material 6; if the number of spiral baffles 101 is too many, the space occupied by the spiral baffles 101 themselves is relatively large, which will hinder the descent of granular silicon material 6, which is not conducive to the feeding of granular silicon material 6 and affects the production rhythm.
[0048] In this embodiment, the number of the spiral baffles 101 is 3-7, which can reduce the speed of the granular silicon material 6 without affecting the feeding of the granular silicon material 6 and the production rhythm.
[0049] In some optional embodiments, continue to refer to Figure 2 and Figure 3 , the included angles of two adjacent spiral baffles 101 are equal.
[0050] In this embodiment, the spiral baffles 101 are evenly distributed on the first surface 11 of the bottom cone 1. The angles between two adjacent spiral baffles 101 are equal, and the amount of granular silicon material 6 entering the vortex space between the two adjacent spiral baffles 101 is also nearly equal, so the speed of the granular silicon material 6 discharged from the spiral bottom cone feeder 100 is also close, ensuring the production rhythm.
[0051] On the other hand, the included angles of two adjacent spiral baffles 101 are equal, which also facilitates the manufacture of the spiral baffles 101 on the first surface 11 of the bottom cone 1 and reduces the manufacturing difficulty.
[0052] In some optional embodiments, continue to refer to Figure 1 , the outer diameter of the bottom cone 1 is larger than the outer diameter of the feeding barrel 2.
[0053] Specifically, the function of the bottom cone 1 is to control the opening and closing of the bottom of the feeding barrel 2. If the outer diameter of the bottom cone 1 is smaller than the outer diameter of the feeding barrel 2, there will be a certain gap between the outer edge of the bottom cone 1 and the feeding barrel 2. Once the granular silicon material 6 is added to the material storage space of the feeding barrel 2, the granular silicon material 6 will leak out from the gap under the action of gravity. In this embodiment, the outer diameter of the bottom cone 1 is larger than the outer diameter of the feeding barrel 2, which can ensure that the bottom of the feeding barrel 2 is closed, and when no material is added, the granular silicon material 6 will not leak out.
[0054] In some optional embodiments, continue to refer to Figure 1 , Figure 2 and Figure 3 , in the direction from the top of the feeding barrel 2 to the bottom of the feeding barrel 2, the orthographic projection of the spiral baffle 101 is located within the orthographic projection of the material placement space.
[0055] It is understandable that, in this embodiment, the orthographic projection of the spiral baffle 101 in the vertical direction is located within the orthographic projection of the material storage space in the vertical direction, and the vertical direction is the direction from the top of the feeding bucket 2 to the bottom of the feeding bucket 2, that is, the outer diameter of the spiral baffle 101 is smaller than the inner diameter of the feeding bucket 2. It is understandable that if the outer diameter of the spiral baffle 101 is larger than the inner diameter of the feeding bucket 2, it will hinder the first surface 11 of the bottom cone 1 from contacting the bottom of the feeding bucket 2, and hinder the bottom cone 1 from sealing the bottom of the feeding bucket 2. In this embodiment, the orthographic projection of the spiral baffle 101 is located within the orthographic projection of the material storage space, thereby ensuring that the first surface 11 of the bottom cone 1 can contact and seal with the bottom of the feeding bucket 2, and when no material is added, it is ensured that the granular silicon material 6 will not leak out.
[0056] In some optional embodiments, continue to refer to Figure 1 , Figure 4 and Figure 5 The outer wall of the feeding barrel 2 also includes a guide cone 201 on one side close to the bottom of the feeding barrel 2 , and the guide cone 201 protrudes from the outer wall of the feeding barrel 2 .
[0057] It is understandable that the single crystal furnace is filled with argon gas 7, and the flow direction of the argon gas 7 is as follows: Figure 5 In the direction of the middle arrow, the argon gas 7 will fly after being blown to the granular silicon. In this embodiment, a guide cone 201 is set on the outer wall of the feeding barrel 2. The guide cone 201 is set around the outer wall periphery of the feeding barrel 2 to form a slope, and this slope is inclined to the side away from the outer wall of the feeding barrel 2. The guide cone 201 is set at the bottom of the feeding barrel 2, which can guide the argon gas 7 to tilt along the inclination direction of the guide cone 201 and to the side away from the feeding barrel 2, further reducing the disturbance of the airflow in the lower area of the feeding barrel 2 to the granular silicon material 6.
[0058] In some optional embodiments, continue to refer to Figure 1 , Figure 4 and Figure 5 , and also includes a limiting flange 3, which is connected to the outer wall of the feeding barrel 2 by bolts.
[0059] It is understandable that the spiral bottom cone feeder 100 needs to sit on the steps inside the single crystal furnace. In this embodiment, a limiting flange 3 is provided on the upper part of the feeding barrel 2, and the limiting flange 3 is connected to the outer wall of the feeding barrel 2 by bolts.
[0060] The working process of the spiral bottom cone feeder 100 of this embodiment is as follows: the spiral bottom cone feeder 100 is placed vertically, with the top of the feeding barrel 2 at the top and the bottom at the bottom. Under the action of gravity, the feeding barrel 2 presses the bottom cone 1, keeping the bottom of the feeding barrel 2 sealed to prevent the silicon material from leaking out. At this time, the feeding barrel 2 is in a closed state. The granular silicon material 6 is poured into the material storage space of the feeding barrel 2 from the top opening of the feeding barrel 2, and the spiral bottom cone feeder 100 is lifted. At this time, under the action of gravity, the feeding barrel 2 remains pressed against the bottom cone 1. After the spiral bottom cone feeder 100 is lifted into the furnace table of the single crystal furnace, the spiral bottom cone feeder 100 is slowly lowered, and the limiting flange 3 is located on the step inside the furnace table. The feeding barrel 2 stops moving and no longer keeps pressing the bottom cone 1. The bottom cone 1 begins to separate from the feeding barrel 2, and the granular silicon material 6 begins to flow downward from the gap between the bottom cone 1 and the bottom of the feeding barrel 2 under the action of gravity. Figure 4 At this time, the granular silicon material 6 will slowly flow out in a rotating manner under the guidance of the spiral baffle 101, and leave the spiral bottom cone feeder 100 along the tangent direction of the outer circle of the bottom cone 1, and fall into the crucible in the furnace platform.
[0061] In some optional embodiments, continue to refer to Figure 1 , Figure 4 and Figure 5 , the spiral bottom cone feeder 100 further includes a lifting rod 4 and a support arm 5, and the support arm 5 is connected to the top of the feeding barrel 2;
[0062] The lifting rod 4 is at least partially located in the material placement space, one end of which is fixedly connected to the center of the bottom cone 1 , and the other end of which passes through the support arm 5 . The lifting rod 4 moves along the extension direction of the feeding barrel 2 .
[0063] Specifically, the support arm 5 is a U-shaped structure, and the ends are fixedly connected to the top of the feeding barrel 2 respectively. The spiral bottom cone feeder 100 can be lifted as a whole by lifting the support arm 5.
[0064] The center of the bottom cone 1 is a through hole, and the lifting rod 4 can be passed through the through hole in the center of the bottom cone 1. A bolt is set on one side of the second surface 12 of the bottom cone 1 to fix the lifting rod 4. The top of the lifting rod 4 passes through the support arm 5. Along the up and down directions, the lifting rod 4 moves downward, which can drive a certain gap between the bottom cone 1 and the feeding bucket 2, and open the bottom of the feeding bucket 2 for feeding. The lifting rod 4 moves upward to close the bottom of the feeding bucket 2 and stop feeding.
[0065] The working process of the spiral bottom cone feeder 100 of this embodiment is as follows: the spiral bottom cone feeder 100 is placed vertically, with the top of the feeding barrel 2 at the top and the bottom of the feeding barrel 2 at the bottom. Under the action of gravity, the feeding barrel 2 presses the bottom cone 1, and the feeding barrel 2 is in close contact with the first surface 11 of the bottom cone 1, keeping the bottom of the feeding barrel 2 sealed to prevent the silicon material from leaking out. At this time, the feeding barrel 2 is in a closed state. The granular silicon material 6 is poured into the material storage space of the feeding barrel 2 from the top opening of the feeding barrel 2, and the spiral bottom cone feeder 100 is lifted by lifting the support arm 5. At this time, under the action of gravity, the feeding barrel 2 remains pressed against the first surface 11 of the bottom cone 1. When the spiral bottom cone feeder 100 is lifted into the furnace table of the single crystal furnace, the spiral bottom cone feeder 100 is slowly lowered, and the limiting flange 3 is located on the step inside the furnace table. The feeding barrel 2 stops moving and no longer keeps pressing the bottom cone 1. The lifting rod 4 slowly descends, and the bottom cone 1 begins to separate from the feeding barrel 2. The granular silicon material 6 begins to flow downward from the gap between the bottom cone 1 and the bottom of the feeding barrel 2 under the action of gravity. Figure 4 At this time, the granular silicon material 6 will slowly flow out in a rotating manner under the guidance of the spiral baffle 101, and leave the spiral bottom cone feeder 100 along the tangent direction of the outer circle of the bottom cone 1, and fall into the crucible in the furnace platform.
[0066] It can be seen from the above embodiments that the spiral bottom cone feeder provided by the utility model achieves at least the following beneficial effects:
[0067] The utility model of the spiral bottom cone feeder includes a feeding barrel, the feeding barrel has a material placement space, the bottom of the feeding barrel is provided with a bottom cone for opening and closing the feeding barrel, the bottom cone includes a first surface and a second surface arranged oppositely, the first surface is the side of the bottom cone close to the top of the feeding barrel; the bottom cone is provided with a spiral baffle protruding from the first surface, and the spiral baffle extends from the edge of the bottom cone to the center of the bottom cone. Through the guiding effect of the spiral baffle, the falling speed of the granular silicon material is greatly slowed down, and at the same time, by changing the flow direction of the granular silicon material, the scattering area of the granular silicon material is further reduced, so that the granular silicon material falls directly below the barrel to the greatest extent, reducing the blowing effect of argon gas on the granular silicon and alleviating the flying of the granular silicon material.
[0068] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.
Claims
1. A spiral bottom cone feeder, characterized in that: The feeding barrel comprises a material-adding barrel having a material-placing space, a bottom cone for opening and closing the feeding barrel is arranged at the bottom of the feeding barrel, the bottom cone comprises a first surface and a second surface arranged oppositely, the first surface being a side of the bottom cone close to the top of the feeding barrel; The bottom cone is provided with a spiral baffle protruding from the first surface, and the spiral baffle extends from the edge of the bottom cone to the center of the bottom cone.
2. The spiral bottom cone feeder according to claim 1, characterized in that: The spiral baffle comprises an edge end and a center end, wherein the edge end is an end of the spiral baffle close to the edge of the bottom cone, and the center end is an end of the spiral baffle close to the center of the bottom cone; The height between the center end and the second surface is a, and the height between the edge end and the second surface is b, where a>b.
3. The spiral bottom cone feeder according to claim 2, characterized in that: The width of the edge end along the first direction is smaller than the width of the center end along the first direction, the direction from the edge end to the center end is the second direction, and the first direction intersects with the second direction.
4. The spiral bottom cone feeder according to claim 1, characterized in that: The number of the spiral baffles is 3-7.
5. The spiral bottom cone feeder according to claim 1, characterized in that: The included angles of two adjacent spiral baffles are equal.
6. The spiral bottom cone feeder according to claim 1, characterized in that: The outer diameter of the bottom cone is greater than the outer diameter of the feeding barrel.
7. The spiral bottom cone feeder according to claim 1, characterized in that: In the direction from the top of the feeding barrel to the bottom of the feeding barrel, the orthographic projection of the spiral baffle is located within the orthographic projection of the material storage space.
8. The spiral bottom cone feeder according to claim 1, characterized in that: The outer wall of the feeding barrel further includes a guide cone on one side close to the bottom of the feeding barrel, and the guide cone protrudes from the outer wall of the feeding barrel.
9. The spiral bottom cone feeder according to claim 1, characterized in that: It also includes a limiting flange, which is connected to the outer wall of the feeding barrel by bolts.
10. The spiral bottom cone feeder according to claim 1, characterized in that: Also included is a lifting rod and a support arm, wherein the support arm is connected to the top of the feeding bucket; The lifting rod is at least partially located in the material placement space, one end of which is fixedly connected to the center of the bottom cone, and the other end of which passes through the support arm. The lifting rod moves along the extension direction of the feeding barrel.