Silica powder filter

Abstract

The utility model discloses a silicon powder filter, which relates to the technical field of silicon powder filtration and comprises a tank body, a pattern plate assembly, a filter element assembly and a back flushing assembly, the tank body comprises an upper sealing head, a middle barrel body and a lower sealing head which are arranged from top to bottom; the tubesheet assembly is assembled between the upper sealing head and the middle barrel in the tank body, and the filter element assembly is assembled on the tubesheet assembly and extends downwards; the back-blowing assembly is assembled in the upper sealing head and comprises a plurality of groups of back-blowing mechanisms, the plurality of groups of back-blowing mechanisms are circumferentially and uniformly arranged and are all welded with the middle support of the circle center, the back-blowing mechanism comprises a back-blowing header pipe, a plurality of back-blowing branch pipes and a support piece, the top ends of the back-blowing branch pipes are communicated with the back-blowing header pipe, and the back-blowing branch pipes are communicated with the support piece. And one end of the supporting piece is connected with the blowback header pipe, and the other end of the supporting piece is welded on the inner wall of the upper sealing head. And the back flushing assembly is integrally welded and fixed in the upper sealing head, so that the back flushing assembly can be directly mounted and dismounted by using the upper sealing head without entering the tank for operation in the mounting and dismounting process.

Description

Technical Field

[0001] The utility model relates to the technical field of silicon powder filtering, and more specifically to a silicon powder filter. Background Art

[0002] During the polysilicon production process, the tail gas is usually treated through a silicon powder filter. The silicon powder filter can filter out the silicon powder in the tail gas and collect it.

[0003] The backflush assembly, flower plate assembly, and filter element are all internal components of the silica powder filter. Inside the silica powder filter, the backflush assembly and filter element are connected by bolts. The flower plate assembly is connected to the backflush assembly and filter element by bolts. The backflush assembly pipe is connected to the backflush assembly by bolts. The backflush assembly pipe is connected to the silica powder filter by welding. When installing the flower plate assembly, filter element, and backflush assembly, maintenance personnel enter the silica powder filter and first install the flower plate, filter element bracket, and positioning rod. After securing the bracket and flower plate with bolts, they insert the filter elements one by one through the flower plate holes. The lower end of the filter element is inserted into the bracket, with one filter element corresponding to one bracket. The upper end of the filter element is secured with a pressure plate and bolts. The filter element is made of ceramic. When tightening the pressure plate bolts, excessive or uneven force can easily cause the filter element to crack or break. Maintenance personnel standing on the flower plate to install the filter element can easily damage the filter element by stepping on it, increasing the filter element loss rate, making maintenance more difficult, and increasing the risk of failure during filter element use. After the filter element is installed, install the back-blowing assembly. The back-blowing assembly is installed in 6 groups. Each nozzle in each group of back-blowing assemblies must be aligned with the inner hole on the upper end of the filter element. The intake pipe flange of each group of back-blowing assemblies is connected to the flange at one end of the intake elbow, and the flange at the other end of the intake elbow is connected to the embedded flange of the back-blowing assembly pipe. After the filter element and back-blowing assembly are installed, install the silicon powder filter head.

[0004] The silicon powder filter cylinder and embedded flange are both made of 15CrMo (H), which is prone to microcracks during the manufacturing process. The weld between the embedded flange of the back-blowing component pipe and the cylinder is a single-sided fillet weld. The fillet weld has only been surface-tested and cannot detect microcracks. After the silicon powder filter has been in operation for a period of time, the embedded flange and weld of the back-blowing gas pipe cause cracks to extend and leak due to repeated stress, resulting in failure of the silicon powder filter. During use, the air intake elbow will produce fatigue stress cracking and leakage due to its structure, resulting in failure of the silicon powder filter.

[0005] In the prior art, patent publication number CN218871599U discloses a synthesis gas filter belonging to the field of polysilicon production technology, comprising a body, a support ring, a flower plate, a filter element, and a pressure plate. The filter elements are arranged in groups of six and are distributed at equal angles within the body. The inner side of the flower plate is provided with a sealing groove, and a sealing gasket is embedded in the sealing groove. The body is fixedly connected to a bracket, and the top of the bracket is fixedly connected to a support frame. By providing a frustum-shaped sealing groove and a sealing gasket on the sealing surface connecting the filter element and the flower plate, the filter element can be thermally sealed and also play a shock-absorbing role between the filter element and the flower plate when the filter element is vibrated by the incoming airflow. At the same time, a support frame is used to fix the bottom of the filter element, which fixes the bottom end of the filter element while ensuring assembly, limiting the amount of swing of the bottom end of the filter element during operation, thereby effectively reducing damage to the filter element caused by vibration and effectively extending the life of the filter element.

[0006] Patent publication number CN220071087U discloses a silicon powder filter, relating to the field of silicon powder filtration technology. The filter element assemblies are arranged in several groups, each of which is mounted on a partition along the circumference of a tank body. Each group of filter element assemblies includes several vertically arranged filter elements. The outlet ends of the backflush branches of the backflush assembly are respectively located above the top outlets of the several filter elements, backflush the several filter elements of the filter element assembly. In other words, each filter element has its own independent backflush branch. The backflush gas in the backflush branch flows from top to bottom within the filter element, cleaning the silicon powder within the filter element, causing the silicon powder to fall from the filter element from top to bottom into the lower cavity and be discharged through the silicon powder outlet. This fully cleans the silicon powder within each filter element and prevents filter element clogging. The backflush assembly is arranged in several groups and connected to several groups of filter element assemblies. When the silicon powder in the tank filter element assembly needs to be cleaned, the filter element assemblies can be cleaned one by one, while the other uncleaned filter element assemblies continue to filter silicon powder normally.

[0007] In the above two existing technology patents, the backflush assembly is assembled into several small components. During installation, each small component is fixed to the support plate with bolts. During disassembly, it is necessary to first enter the tank through the manhole and remove the small component fixing bolts before the backflush assembly can be removed, and then the head and filter element assembly can be disassembled, which makes installation and disassembly more inconvenient. Utility Model Content

[0008] In order to overcome the defects in the above-mentioned prior art, the purpose of the present invention is to provide a silicon powder filter to solve the problem of inconvenience in installation and disassembly of the backflush assembly in the above-mentioned prior art.

[0009] In order to achieve the above objectives, the technical solution adopted by this utility model is:

[0010] A silicon powder filter comprises a tank body, a flower plate assembly, a filter element assembly and a backflush assembly;

[0011] The tank body includes an upper head, an intermediate cylinder and a lower head arranged from top to bottom; the flower plate assembly is assembled between the upper head and the intermediate cylinder in the tank body, and the filter element assembly is assembled on the flower plate assembly and extends downward;

[0012] The back-blowing assembly is assembled in the upper head. The back-blowing assembly includes several groups of back-blowing mechanisms. The several groups of back-blowing mechanisms are evenly arranged in a circle and are welded to the middle support at the center of the circle. The back-blowing mechanism includes a back-blowing main pipe, a back-blowing branch pipe and a support. Several back-blowing branches are provided, the top ends of which are connected to the back-blowing main pipe, and the bottom ends extend downward and are located above the filter element assembly. One end of the support is connected to the back-blowing main pipe, and the other end is welded to the inner wall of the upper head.

[0013] Preferably, the top of the backflush main pipe is connected to an air inlet straight pipe through a flange, the top of the air inlet straight pipe is connected to a forged pipe, the forged pipe passes through the upper head upward and is double-sidedly fillet welded to the inner and outer walls of the upper head, and after passing through the upper head, the forged pipe is connected to the air inlet pipe outside the tank through a flange.

[0014] Preferably, a material inlet is provided on the side wall of the intermediate cylinder, a material outlet is provided on the top of the upper head, and a silicon powder outlet is provided on the bottom of the lower head.

[0015] Preferably, the flower panel assembly includes a flower panel, a support ring and a rib plate, the support ring is arranged at the top inner side of the middle cylinder, the rib plate is located below the support ring to support the support ring, the outer periphery of the flower panel is overlapped on the support ring and the flower panel and the support ring are connected by bolts.

[0016] Preferably, the filter element assembly includes a filter element, a filter element bracket and a positioning rod;

[0017] The filter element bracket is mounted on the flower plate through the positioning rod. A plurality of brackets are arranged on the filter element bracket. The filter element is provided with a plurality of and mounted in the plurality of brackets. A back-blowing branch pipe is arranged above each filter element.

[0018] Preferably, the upper end of the filter element is fixed to the flower plate by a pressing plate and bolts.

[0019] Preferably, the backflush component is made of S31603.

[0020] Preferably, six groups of backflush mechanisms are provided.

[0021] Beneficial effects of the utility model:

[0022] The silicon powder filter provided by the utility model has several groups of back-blowing mechanisms of the back-blowing assembly welded on the middle support, and the several groups of back-blowing mechanisms are welded together. At the same time, each group of back-blowing mechanisms is welded to the inner wall of the upper head using a support member, that is, the back-blowing assembly is welded and fixed in the upper head as a whole. When installing and removing, there is no need to enter the tank first to operate, and the upper head can be directly used for installation and removal.

[0023] The silicon powder filter provided by the utility model changes the embedded flange of the back-blowing air pipe into a forged pipe, and the installation position of the forged pipe is changed from the silicon powder filter cylinder to the upper head. The forged pipe and the upper head shell are welded by double-sided welding, which can eliminate micro cracks generated during the manufacturing process, avoid repeated stress during use, and prevent the silicon powder filter from failing.

[0024] The silicon powder filter provided by the utility model welds 6 groups of back-blowing mechanisms into one group of back-blowing components, changes the material from 15CrMo to S31603, and changes the intake elbow of the back-blowing component to an intake straight pipe, which can avoid the intake pipe from failing due to fatigue stress cracking and leakage, avoid failure of the silicon powder filter, and reduce the maintenance workload of maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the silicon powder filter of the utility model;

[0026] Figure 2 This is a schematic diagram of the backflush assembly of the utility model;

[0027] Figure 3 This is a top view of the backflush assembly of the present invention;

[0028] Figure 4 For this utility model Figure 1 Enlarged view of part I;

[0029] Reference numerals:

[0030] 1. Tank body; 11. Upper head; 12. Intermediate cylinder; 13. Lower head; 14. Material inlet; 15. Material outlet; 16. Silica powder outlet; 2. Flower plate assembly; 21. Flower plate; 22. Support ring; 23. Rib plate; 3. Filter element assembly; 31. Filter element; 32. Filter element bracket; 33. Positioning rod; 4. Backflush assembly; 41. Intermediate support; 42. Backflush main pipe; 43. Backflush branch pipe; 44. Support member; 45. Air inlet straight pipe; 46. Forging connecting pipe; 47. Air inlet pipe outside the tank. DETAILED DESCRIPTION

[0031] The following will provide a clear and complete description of the concept, specific structure and technical effects of the present invention in conjunction with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present invention.

[0032] Example 1

[0033] A silica powder filter, such as Figures 1-4 As shown, it includes a tank body 1, a flower plate assembly 2, a filter element assembly 3 and a backflush assembly 4;

[0034] The tank body 1 includes an upper head 11, an intermediate cylinder 12, and a lower head 13 arranged from top to bottom; the flower plate assembly 2 is assembled between the upper head 11 and the intermediate cylinder 12 in the tank body 1, and the filter element assembly 3 is assembled on the flower plate assembly 2 and extends downward;

[0035] like Figure 2 and 3 As shown, the backflush assembly 4 is assembled in the upper head 11. The backflush assembly 4 includes several groups of backflush mechanisms. The several groups of backflush mechanisms are evenly arranged in a circle and are welded to the middle support 41 at the center of the circle. The backflush mechanism includes a backflush main pipe 42, a backflush branch pipe 43 and a support 44. Several backflush branches 43 are provided, the top of which is connected to the backflush main pipe 42, and the bottom end extends downward and is located above the filter element assembly 3. One end of the support 44 is connected to the backflush main pipe 42, and the other end is welded to the inner wall of the upper head 11.

[0036] In this embodiment, several groups of back-blowing mechanisms of the back-blowing assembly 4 are welded on the middle support 41, and the several groups of back-blowing mechanisms are welded together. At the same time, each group of back-blowing mechanisms is welded to the inner wall of the upper head 11 using the support 44, that is, the back-blowing assembly 4 is welded and fixed as a whole in the upper head 11. When installing and removing, there is no need to enter the tank first to operate, and the upper head 11 can be directly used for installation and removal.

[0037] like Figure 1 As shown, the top of the backflush manifold 42 is connected to an air inlet pipe 45 via a flange. The top of the air inlet pipe 45 is connected to a forged pipe 46. The forged pipe 46 extends upward through the upper head 11 and is fillet-welded to the inner and outer walls of the upper head 11 on both sides. After extending through the upper head 11, the forged pipe 46 is connected to the tank's external air inlet pipe 47 via a flange. Six backflush mechanisms are provided, and the backflush components are made of S31603.

[0038] In this embodiment, six backflush mechanisms are welded together into a single backflush assembly. The material is changed from 15CrMo to S31603. The air intake elbow of the backflush assembly 4 is replaced with an air intake straight pipe 45. This prevents the air intake pipe from failing due to fatigue stress cracking and leakage, prevents silicon powder filter failure, and reduces the maintenance workload for maintenance personnel. The embedded flange of the backflush air connection pipe is replaced with a forged connection pipe 46. The installation position of the forged connection pipe 46 is changed from the silicon powder filter cylinder to the upper head 11. The forged connection pipe 46 is welded to the upper head 11 shell using double-sided welding. This eliminates microcracks generated during the manufacturing process, avoids repeated stress during use, and prevents silicon powder filter failure.

[0039] The forging pipe 46 passes through the upper head 11 upward and is double-sided fillet welded with the inner and outer walls of the upper head 11. The backflush assembly 4 is connected to the upper head 11 of the silicon powder filter and can be installed and removed together with the upper head 11, which can reduce the maintenance workload.

[0040] like Figure 1 As shown, a material inlet 14 is provided on the side wall of the middle cylinder 12 for feeding, a material outlet 15 is provided on the top of the upper head 11 for discharging, and a silicon powder outlet 16 is provided at the bottom of the lower head 13 for discharging filtered silicon powder.

[0041] like Figure 1 As shown, the flower panel assembly 2 includes a flower panel 21, a support ring 22 and a rib plate 23. The support ring 22 is arranged at the top inner side of the intermediate cylinder 12, and the rib plate 23 is located below the support ring 22 to support the support ring 22. The outer periphery of the flower panel 21 is overlapped on the support ring 22 and the flower panel 21 and the support ring 22 are connected by bolts to install and support the flower panel 21.

[0042] like Figure 1 As shown, the filter element assembly 3 includes a filter element 31, a filter element bracket 32, and a positioning rod 33. The filter element bracket 32 is assembled on the flower plate 21 via the positioning rod 33. The filter element bracket 32 is provided with a plurality of brackets, and the filter element 31 is provided with a plurality of brackets and assembled in the plurality of brackets. A backflush branch pipe 43 is provided above each filter element 31. The upper end of the filter element 31 is fixed to the flower plate 21 via a pressure plate and bolts.

[0043] In this embodiment, for the installation of the flower plate assembly 2 and the filter element assembly 3, first install the filter element bracket 32, the positioning rod 33 and the flower plate 21, fix the filter element bracket 32 and the flower plate 21 with bolts, and then insert the filter elements 31 one by one through the flower plate hole for installation, insert the lower end of the filter element into the bracket, one filter element corresponds to one bracket, and the upper end of the filter element is fixed with a pressure plate and bolts. Since the installation height of the flower plate assembly is increased (the installation position of the flower plate assembly 2 is changed from 900mm away from the large flange sealing surface of the cylinder to be flush with the large flange sealing surface of the cylinder), maintenance personnel do not need to enter the interior of the silicon powder filter for installation, which can effectively avoid damage to the filter element due to stepping, reduce the filter element loss rate, reduce the difficulty of maintenance, and reduce the filter element failure rate during operation.

[0044] The above is a detailed description of the implementation methods of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalents or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A silicon powder filter, characterized in that: It includes a tank body (1), a flower plate assembly (2), a filter element assembly (3) and a backflush assembly (4); The tank body (1) comprises an upper head (11), an intermediate cylinder (12), and a lower head (13) arranged from top to bottom; the flower plate assembly (2) is assembled between the upper head (11) and the intermediate cylinder (12) in the tank body (1), and the filter element assembly (3) is assembled on the flower plate assembly (2) and extends downward; The back-blowing assembly (4) is assembled in the upper head (11). The back-blowing assembly (4) includes a plurality of back-blowing mechanisms. The plurality of back-blowing mechanisms are evenly arranged in a circle and are welded to the middle support (41) at the center of the circle. The back-blowing mechanism includes a back-blowing main pipe (42), a back-blowing branch pipe (43) and a support member (44). The back-blowing branch pipe (43) is provided with a plurality of top ends thereof being connected to the back-blowing main pipe (42), and the bottom ends thereof extending downward and being located above the filter element assembly (3). One end of the support member (44) is connected to the back-blowing main pipe (42), and the other end is welded to the inner wall of the upper head (11).

2. A silicon powder filter according to claim 1, characterized in that: The top end of the backflush main pipe (42) is connected to an air inlet straight pipe (45) via a flange, and the top end of the air inlet straight pipe (45) is connected to a forged pipe (46). The forged pipe (46) passes through the upper head (11) upward and is double-sided fillet welded to the inner and outer walls of the upper head (11). After passing through the upper head (11), the forged pipe (46) is connected to an air inlet pipe (47) outside the tank via a flange.

3. A silicon powder filter according to claim 1, characterized in that: A material inlet (14) is provided on the side wall of the intermediate cylinder (12), a material outlet (15) is provided on the top of the upper head (11), and a silicon powder outlet (16) is provided on the bottom of the lower head (13).

4. A silicon powder filter according to claim 1, characterized in that: The flower plate assembly (2) comprises a flower plate (21), a support ring (22) and a rib plate (23), wherein the support ring (22) is arranged at the top inner side of the intermediate cylinder (12), and the rib plate (23) is located below the support ring (22) to support the support ring (22), and the outer periphery of the flower plate (21) is overlapped on the support ring (22) and the flower plate (21) and the support ring (22) are connected by bolts.

5. A silicon powder filter according to claim 4, characterized in that: The filter element assembly (3) comprises a filter element (31), a filter element bracket (32) and a positioning rod (33); The filter element bracket (32) is assembled on the flower plate (21) through the positioning rod (33). A plurality of brackets are provided on the filter element bracket (32). The filter element (31) is provided with a plurality of brackets and assembled in the plurality of brackets. A backflush branch pipe (43) is provided above each filter element (31).

6. A silicon powder filter according to claim 5, characterized in that: The upper end of the filter element (31) is fixed to the flower plate (21) via a pressing plate and bolts.

7. The silicon powder filter according to claim 1, characterized in that: The material of the backflush component is S31603.

8. The silicon powder filter according to claim 1, characterized in that: The back-blowing mechanism is provided in six groups.

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