Silicon powder sedimentation device

Abstract

The present application provides a silicon powder sedimentation device. The silicon powder sedimentation device includes: a first conveying member, a sedimentation member, and a second conveying member. The first conveying member is used for external exhaust gas, and the sedimentation member is formed with an inlet portion, a receiving chamber, and an outlet portion that are connected in sequence. The inlet portion is connected to the first conveying member, and the receiving chamber is used to receive the exhaust gas; the second conveying member is used for external filter, and the end of the second conveying member facing away from the filter is connected to the outlet portion; in the projection of the first direction, the maximum cross-sectional size of the first conveying member is less than or equal to the minimum cross-sectional size of the receiving chamber. The silicon powder sedimentation device of the present application can solve the problem that when there are many solid impurities in the exhaust gas, the load of the silicon powder filter is large, which will lead to a reduction in the service life of the filter element.

Description

Technical Field

[0001] The present application relates to the technical field of silicon powder filtration, and in particular to a silicon powder sedimentation device. Background Art

[0002] In the polysilicon production process, the tail gas is generally treated through a silicon powder filter. The silicon powder filter can filter out the silicon powder in the tail gas and collect it. The tail gas is connected to the silicon powder filter, which can filter the solid impurities in the tail gas and guide the gas in the tail gas to the next process.

[0003] In the related art, the silicon powder filter is provided with a filter element, which can filter the exhaust gas. The exhaust gas enters the silicon powder filter under the drive of external force and reaches the filter element. The gas in the exhaust gas can pass through the filter element and enter the next process. The solid impurities in the exhaust gas will be isolated by the filter element and precipitated to the bottom of the silicon powder filter under the action of gravity.

[0004] When there are many solid impurities in the exhaust gas, the load on the silicon powder filter is large, which will reduce the service life of the filter element. Utility Model Content

[0005] The present application provides a silicon powder sedimentation device, which is used to solve the problem that when there are many solid impurities in the exhaust gas, the load on the silicon powder filter is large, which will lead to a reduction in the service life of the filter element.

[0006] The present application provides a silicon powder sedimentation device, comprising:

[0007] A first conveying member, the first conveying member is used for externally connecting the exhaust gas;

[0008] A sinker, wherein the sinker is formed with an inlet portion, a receiving chamber and an outlet portion which are connected in sequence, the inlet portion is connected to the first conveying member, and the receiving chamber is used to receive the exhaust gas;

[0009] A second conveying member, the second conveying member is used for externally connecting to the filter, and one end of the second conveying member facing away from the filter is connected to the outlet portion;

[0010] Wherein, in the projection in the first direction, the maximum cross-sectional dimension of the first conveying member is smaller than or equal to the minimum cross-sectional dimension of the accommodating cavity.

[0011] Optionally, in the vertical first direction, the lowest position of the outlet portion is higher than the highest position of the inlet portion;

[0012] And / or, in the first direction, the discharge portion is located on a side of the introduction portion facing away from the first conveying member.

[0013] Optionally, the sinker is formed with a guide cavity, which is connected to the accommodating cavity; the guide cavity is used to accommodate solid impurities in the tail gas;

[0014] In the height direction of the sinker, the guide cavity is located below the accommodating cavity;

[0015] And / or, the guiding cavity is located on a side of the accommodating cavity away from the leading-out portion.

[0016] Optionally, when the guiding cavity is located below the accommodating cavity, the lowest position of the introduction portion is higher than the highest position of the guiding cavity.

[0017] Optionally, in the case where the guide cavity is located on a side of the accommodating cavity away from the outlet portion, the sinker is formed with a filter portion, which is arranged on a side of the guide cavity away from the inlet portion; the filter portion is used to limit the movement of solid impurities;

[0018] The inlet portion, the guide cavity, the filter portion, the accommodating cavity and the outlet portion are connected in sequence.

[0019] Optionally, also include:

[0020] The collecting piece is arranged on the side of the guiding cavity away from the introducing part; the collecting piece is used to receive the solid impurities; the collecting piece is formed with a conveying part, and the conveying part can guide the solid impurities to the outside.

[0021] Optionally, also include:

[0022] A connecting member, one end of which is connected to the first conveying member, and the other end of which is connected to the second conveying member.

[0023] Optionally, also include:

[0024] A first switch member, disposed on the first conveying member, the first switch member can open or close the connection between the first conveying member and the sinking member;

[0025] And / or, a second switch member is arranged on the connecting member, and the second switch member can open or close the connection between the first conveying member and the second conveying member.

[0026] Optionally, also include:

[0027] The third switch element is arranged on the second conveying element, and the third switch element can open or close the communication between the sedimentation element and the filter.

[0028] Optionally, also include:

[0029] The limiting member is arranged in the accommodating cavity and is used for limiting the movement of solid impurities in the exhaust gas.

[0030] The silicon powder settling device provided by the present application is characterized in that the tail gas moves toward the side close to the first conveying member under the driving of the first external force, and is guided to the settling member through the first conveying member, so as to be guided to the filter through the second conveying member. The maximum cross-sectional dimension of the first conveying member is less than or equal to the minimum cross-sectional dimension of the accommodating chamber. In the process of the tail gas being guided from the first conveying member to the accommodating chamber, the cross-sectional dimension of the position where the tail gas flows increases, the movement speed of the tail gas decreases, and the solid impurities in the tail gas settle downward under the action of gravity, and the movement speed of the gas in the tail gas slows down and is located on the upper layer of the solid impurities, thereby separating the gas and solid impurities in the tail gas to reduce the mass of the solid impurities flowing into the filter, thereby reducing the load of the filter and extending the service life of the filter element.

[0031] Therefore, the silicon powder sedimentation device provided in the present application can solve the problem that when there are many solid impurities in the exhaust gas, the load on the silicon powder filter is large, which will lead to a reduction in the service life of the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0033] Figure 1 A schematic diagram of the main structure of a silicon powder settling device provided in an embodiment of the present application;

[0034] Description of reference numerals:

[0035] 1-first conveying member;

[0036] 2-sinking member; 21-introduction part; 22-accommodation chamber; 23-exit part;

[0037] 3- second conveying member;

[0038] 4-Connectors;

[0039] 5- first switch element;

[0040] 6- second switch member;

[0041] 7- third switch member;

[0042] 8-Collection pieces;

[0043] X - first direction.

[0044] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0048] The terms "first", "second" and "third" (if any) in the specification and claims of this application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0049] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0050] In the polysilicon production process, the tail gas is generally treated through a silicon powder filter. The silicon powder filter can filter out the silicon powder in the tail gas and collect it. The tail gas is connected to the silicon powder filter, which can filter the solid impurities in the tail gas and guide the gas in the tail gas to the next process.

[0051] In the related art, the silicon powder filter is provided with a filter element, which can filter the exhaust gas. The exhaust gas enters the silicon powder filter under the driving force and reaches the filter element. The gas in the exhaust gas can pass through the filter element and enter the next process. The solid impurities in the exhaust gas will be isolated by the filter element and precipitated to the bottom of the silicon powder filter under the action of gravity.

[0052] When there are many solid impurities in the exhaust gas, the load on the silicon powder filter is large, which will reduce the service life of the filter element.

[0053] like Figure 1 As shown, the embodiment of the present application provides a silicon powder settling device, comprising: a first conveying member 1, a settling member 2 and a second conveying member 3. The first conveying member 1 is used for externally connecting exhaust gas, and the settling member 2 is formed with an inlet portion 21, a receiving chamber 22 and an outlet portion 23 which are connected in sequence, the inlet portion 21 is connected to the first conveying member 1, and the receiving chamber 22 is used to receive the exhaust gas; the second conveying member 3 is used for externally connecting a filter, and the end of the second conveying member 3 which is away from the filter is connected to the outlet portion 23; in the projection of the first direction X, the maximum cross-sectional dimension of the first conveying member 1 is less than or equal to the minimum cross-sectional dimension of the receiving chamber 22.

[0054] It should be noted that the exhaust gas moves toward the side close to the first conveying member 1 driven by the first external force, and is guided to the settling member 2 through the first conveying member 1 , and is guided to the filter through the second conveying member 3 .

[0055] It should be noted that the maximum cross-sectional dimension of the first conveying member 1 is less than or equal to the minimum cross-sectional dimension of the accommodating chamber 22. In the process of the exhaust gas being guided from the first conveying member 1 to the accommodating chamber 22, the cross-sectional area of ​​the exhaust gas flowing through the position increases, and the movement speed of the exhaust gas decreases. The solid impurities in the exhaust gas will settle downward under the action of gravity, and the movement speed of the gas in the exhaust gas will slow down and be located on the upper layer of the solid impurities. In this way, the gas and solid impurities in the exhaust gas can be separated to reduce the mass of the solid impurities flowing into the filter, thereby reducing the load of the filter and extending the service life of the filter element.

[0056] Therefore, the silicon powder sedimentation device provided in the present application can solve the problem that when there are many solid impurities in the exhaust gas, the load on the silicon powder filter is large, which will lead to a reduction in the service life of the filter element.

[0057] It should be noted that the lead-out portion 23 and the lead-in portion 21 have a variety of different positional relationships. The positions of the lead-out portion 23 and the lead-in portion 21 are described below with examples.

[0058] In a feasible implementation manner, in the vertical first direction X, the lowest position of the outlet portion 23 is higher than the highest position of the inlet portion 21 .

[0059] It should be noted that the position of the outlet portion 23 is higher than that of the inlet portion 21. The upper layer of gas in the accommodating chamber 22 can be guided to the second conveying member 3 through the outlet portion 23 to reduce the movement of the lower layer of solid impurities in the accommodating chamber 22 toward the second conveying member 3, thereby improving the sedimentation efficiency of the solid impurities inside the accommodating chamber 22.

[0060] In another possible embodiment, in the first direction X, the discharge portion 23 is located on a side of the introduction portion 21 facing away from the first conveying member 1 .

[0061] It should be noted that the solid impurities in the exhaust gas settle downward under the action of gravity, and the outlet portion 23 is arranged on the side of the inlet portion 21 away from the first conveying member 1, which can increase the flow distance of the exhaust gas, thereby improving the sedimentation efficiency of the solid impurities in the exhaust gas, so as to reduce the weight of the solid impurities flowing into the outlet portion 23, thereby reducing the weight of the solid impurities flowing into the filter.

[0062] In addition, in another feasible embodiment, in the vertical first direction X, the lowest position of the outlet portion 23 is higher than the highest position of the inlet portion 21 ; and in the first direction X, the outlet portion 23 is located on the side of the inlet portion 21 away from the first conveying member 1 .

[0063] It should be noted that the position of the outlet portion 23 is higher than that of the inlet portion 21. The upper gas in the accommodating chamber 22 can be guided to the second conveying member 3 through the outlet portion 23 to reduce the movement of the lower solid impurities in the accommodating chamber 22 toward the second conveying member 3, thereby improving the sedimentation efficiency of the solid impurities inside the accommodating chamber 22; the solid impurities in the exhaust gas settle downward under the action of gravity, and the outlet portion 23 is arranged on the side of the inlet portion 21 away from the first conveying member 1, which can increase the flow distance of the exhaust gas, thereby improving the sedimentation efficiency of the solid impurities in the exhaust gas, so as to reduce the weight of the solid impurities flowing into the outlet portion 23, thereby reducing the weight of the solid impurities flowing into the filter.

[0064] It is understandable that there is no limitation on the specific locations of the exporting portion 23 and the importing portion 21 , and they can be selected according to actual usage requirements.

[0065] The sinker 2 provided in the embodiment of the present application is formed with a guide cavity, which is communicated with the accommodating cavity 22 , and the guide cavity is used to accommodate solid impurities in the exhaust gas.

[0066] It should be noted that there are many different arrangements between the accommodating cavity 22 and the guiding cavity. The arrangements between the accommodating cavity 22 and the guiding cavity are described below in turn with examples.

[0067] In a feasible implementation, in the height direction of the sinker 2 , the guide cavity is located below the accommodating cavity 22 .

[0068] It can be understood that the guiding cavity is arranged below the containing cavity 22 to contain the settled solid impurities.

[0069] In another possible implementation, the guide cavity is located on the side of the accommodating cavity 22 facing away from the outlet portion 23 .

[0070] It can be understood that the guide cavity can accommodate solid impurities in the exhaust gas, and the gas in the exhaust gas can pass through the guide cavity into the accommodating cavity 22 to separate the solid impurities and gas in the exhaust gas.

[0071] In addition, in other feasible implementations, in the height direction of the sinker 2 , the guide cavity is located below the accommodating cavity 22 ; and the guide cavity is located on the side of the accommodating cavity 22 away from the outlet portion 23 .

[0072] It can be understood that the guide chamber is arranged below the accommodating chamber 22, and can accommodate the settled solid impurities; the guide chamber can accommodate the solid impurities in the exhaust gas, and the gas in the exhaust gas can pass through the guide chamber into the accommodating chamber 22 to separate the solid impurities and gas in the exhaust gas.

[0073] It is understandable that there is no limitation on the arrangement of the guide cavity and the accommodating cavity 22, and they can be selected according to actual use requirements.

[0074] It should be noted that, when the guiding cavity is located below the accommodating cavity 22 , the lowest position of the introducing portion 21 is higher than the highest position of the guiding cavity.

[0075] It can be understood that the lowest position of the inlet part 21 is higher than the highest position of the guide cavity, which can reduce the movement of solid impurities settled in the guide cavity toward the side close to the inlet part 21, thereby causing solid impurities to block the inlet part 21, thereby improving the operating stability of the silicon powder sedimentation device.

[0076] It should be noted that, when the guide cavity is located on the side of the accommodating cavity 22 away from the outlet portion 23, the sedimentation member 2 is formed with a filter portion, which is arranged on the side of the guide cavity away from the inlet portion 21, and is used to limit the movement of solid impurities.

[0077] It should be noted that the introduction part 21, the guide cavity, the filter part, the accommodating cavity 22 and the outlet part 23 are connected in sequence. The tail gas can enter the guide cavity through the introduction part 21 under the action of the second external force, and the solid impurities in the tail gas are isolated in the guide cavity by the filter part. The gas in the tail gas passes through the filter part and enters the accommodating cavity 22, and is guided to the outlet part 23 after passing through the accommodating cavity 22. The weight of the solid impurities flowing into the outlet part 23 is reduced, thereby reducing the weight of the solid impurities flowing into the filter, thereby reducing the load of the filter, and extending the service life of the filter element.

[0078] The silicon powder sedimentation device provided in the embodiment of the present application also includes: a collecting piece 8, which is connected to the side of the guide cavity away from the introduction part 21; the collecting piece 8 is used to receive solid impurities; the collecting piece 8 is formed with a conveying part, which can guide the solid impurities to the outside.

[0079] It should be noted that the collecting member 8 has a variety of different configurations, and the configurations of the collecting member 8 are described below in turn with examples.

[0080] In a feasible implementation, the collecting member 8 may be a catheter, one end of which is connected to the guide cavity, and the other end of which is externally connected to the next process.

[0081] It should be noted that, in the height direction of the sinker 2, the highest position of the connection between the conduit and the guide cavity is lower than the lowest position of the guide cavity, and the solid impurities can be guided from the guide cavity to the conduit under the action of their own gravity, and then guided to the next process through the conduit, so as to reduce the deposition of solid impurities.

[0082] In another feasible implementation manner, the collecting member 8 may be a guide groove, one end of which is connected to the guide cavity, and the other end of which is externally connected to the next process.

[0083] It should be noted that, in the height direction of the sinker 2, the highest position of the connection between the guide groove and the guide cavity is lower than the lowest position of the guide cavity, and the solid impurities can be guided from the guide cavity to the guide groove under the action of their own gravity, and then guided to the next process through the guide groove, so as to reduce the deposition of solid impurities.

[0084] It is understandable that there is no limitation on the specific configuration of the collecting element 8, and it can be selected according to actual use requirements, as long as it can ensure that the solid impurities can be guided to the outside.

[0085] The silicon powder settling device provided in the embodiment of the present application further includes: a connecting member 4 , one end of the connecting member 4 is connected to the first conveying member 1 , and the other end of the connecting member 4 is connected to the second conveying member 3 .

[0086] It should be noted that the exhaust gas can be driven by the third external force to pass through the first conveying member 1 and then be guided to the connecting member 4 , and then be guided to the second conveying member 3 through the connecting member 4 .

[0087] It should be noted that the connecting member 4 is connected in parallel with the settling member 2 , and the connecting member 4 can increase the conveying speed of the exhaust gas.

[0088] The silicon powder settling device provided in the embodiment of the present application further includes: a first switch member 5 , which is disposed on the first conveying member 1 , and the first switch member 5 can open or close the connection between the first conveying member 1 and the settling member 2 .

[0089] The silicon powder settling device provided in the embodiment of the present application further includes: a second switch member 6 , which is disposed on the connecting member 4 , and the second switch member 6 can open or close the connection between the first conveying member 1 and the second conveying member 3 .

[0090] The silicon powder settling device provided in the embodiment of the present application further includes: a third switch member 7, which is disposed on the second conveying member 3, and the third switch member 7 can open or close the connection between the settling member 2 and the filter.

[0091] When the connecting member 4 is connected in parallel with the sinking member 2, the first switch member 5, the second switch member 6 and the third switch member 7 have a variety of different working modes. The working modes of the first switch member 5, the second switch member 6 and the third switch member 7 are illustrated in turn below.

[0092] In a feasible implementation manner, the first switch member 5 and the third switch member 7 are opened, and the second switch member 6 is closed, so that the exhaust gas can flow between the first conveying member 1 , the settling member 2 , and the second conveying member 3 .

[0093] In another feasible implementation manner, the first switch element 5 and the third switch element 7 are closed, and the second switch element 6 is opened, so that the exhaust gas can flow between the first conveying member 1 , the connecting member 4 , and the second conveying member 3 .

[0094] In addition, in another feasible embodiment, the first switch member 5, the second switch member 6, and the third switch member 7 are opened, and the exhaust gas can flow between the first conveying member 1, the settling member 2, and the second conveying member 3, and the exhaust gas can flow between the first conveying member 1, the connecting member 4, and the second conveying member 3.

[0095] It is understandable that there is no restriction on the working modes of the first switch element 5 , the second switch element 6 and the third switch element 7 , and they can be selected according to actual use requirements, as long as the silicon powder settling device can operate stably.

[0096] The silicon powder settling device provided in the embodiment of the present application further includes: a limiting member, which is disposed in the accommodating chamber 22 and is used to limit the movement of solid impurities in the exhaust gas.

[0097] It should be noted that when the exhaust gas is moving, the solid impurities in the exhaust gas hit the limiter, which will cause the flow rate of the solid impurities to slow down. The solid impurities move downward under the drive of their own gravity and settle.

[0098] It should be noted that there are many different ways to set the limiter, and the following will illustrate the ways to set the limiter in turn with examples.

[0099] In a feasible embodiment, the limiting member may be a baffle, which is formed with a fixed portion and a passing portion, the fixed portion is installed on the inner wall of the accommodating cavity 22, and the passing portion is arranged on the side of the fixed portion away from the accommodating cavity 22, the fixed portion is used to connect the accommodating cavity 22 and the baffle, and the passing portion is used to guide the movement of the exhaust gas.

[0100] In another feasible embodiment, the limiter may be a filter screen, which is arranged on the inner wall of the accommodating chamber 22. The filter screen has a plurality of filter holes arranged at intervals, and the gas in the exhaust gas can pass through the filter holes, while the solid impurities in the exhaust gas are blocked by the filter screen.

[0101] It is understandable that there is no restriction on the specific setting method of the limiter, and it can be selected according to actual use requirements, as long as it can ensure that the solid impurities in the exhaust gas can be blocked.

[0102] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0103] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A silicon powder sedimentation device, characterized in that: include: a first conveying member, the first conveying member being used for externally connecting exhaust gas; A sinker, wherein the sinker is formed with an inlet portion, a receiving chamber, and an outlet portion which are connected in sequence, the inlet portion is connected to the first conveying member, and the receiving chamber is used to receive the exhaust gas; a second conveying member, the second conveying member being used for externally connecting to a filter, and an end of the second conveying member facing away from the filter being connected to the outlet portion; Wherein, in the projection in the first direction, the maximum cross-sectional dimension of the first conveying member is smaller than or equal to the minimum cross-sectional dimension of the accommodating cavity.

2. A silicon powder sedimentation device according to claim 1, characterized in that: In the direction perpendicular to the first direction, the lowest position of the outlet portion is higher than the highest position of the inlet portion; And / or, in the first direction, the outlet portion is located at a side of the inlet portion facing away from the first conveying member.

3. A silicon powder sedimentation device according to claim 1, characterized in that: The sinker is formed with a guide cavity, and the guide cavity is connected to the accommodation cavity; the guide cavity is used to accommodate solid impurities in the tail gas; In the height direction of the sinker, the guide cavity is located below the accommodating cavity; And / or, the guiding cavity is located on a side of the accommodating cavity away from the outlet portion.

4. A silicon powder sedimentation device according to claim 3, characterized in that: In the case where the guiding cavity is located below the accommodating cavity, the lowest position of the introduction portion is higher than the highest position of the guiding cavity.

5. The silicon powder settling device according to claim 3, characterized in that: In the case where the guide cavity is located at a side of the accommodating cavity away from the outlet portion, the sinker is formed with a filter portion, and the filter portion is arranged at a side of the guide cavity away from the inlet portion; the filter portion is used to limit the movement of the solid impurities; The introduction part, the guide cavity, the filter part, the accommodating cavity and the outlet part are sequentially connected and arranged.

6. The silicon powder settling device according to claim 3, characterized in that: Also includes: A collecting member, the collecting member is arranged in communication with a side of the guide cavity away from the introduction portion; The collecting member is used to receive the solid impurities; The collecting member is formed with a conveying portion, and the conveying portion can guide the solid impurities to the outside.

7. A silicon powder sedimentation device according to any one of claims 1 to 6, characterized in that: Also includes: A connecting member, one end of which is connected to the first conveying member, and the other end of which is connected to the second conveying member.

8. The silicon powder settling device according to claim 7, characterized in that: Also includes: a first switch member, disposed on the first conveying member, the first switch member being capable of opening or closing the connection between the first conveying member and the sinking member; The second switch member is arranged on the connecting member, and the second switch member can open or close the connection between the first conveying member and the second conveying member.

9. A silicon powder sedimentation device according to claim 8, characterized in that: Also includes: A third switch element is arranged on the second conveying element, and the third switch element can open or close the communication between the sedimentation element and the filter.

10. A silicon powder settling device according to any one of claims 1 to 6, characterized in that: Also includes: A limiting member is arranged in the accommodating cavity, and is used for limiting the movement of solid impurities in the tail gas.

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