A centrifugal fan sand filter

Abstract

This application relates to a centrifugal fan sand filter, belonging to the field of centrifugal fan technology. The centrifugal fan sand filter includes a housing, one end of which is connected to the air inlet of the centrifugal fan. An air inlet is also provided on the side wall of the housing. A blocking mechanism is provided on the housing, comprising a plurality of first blocking frames and a plurality of second blocking frames. Each first blocking frame and each second blocking frame is disposed on the housing, and the opening formed by the gap between adjacent first blocking frames is located on the side of the corresponding second blocking frame away from the air inlet. This application has the effect of reducing blockage at the air inlet of the centrifugal fan.

Description

Technical Field

[0001] This application relates to the field of centrifugal fan technology, and in particular to a centrifugal fan sand filter. Background Technology

[0002] Centrifugal fans, which use high-speed rotating impellers to accelerate gas and then convert kinetic energy into pressure energy by decelerating and changing the flow direction, thereby increasing gas pressure and discharging gas, have advantages such as high efficiency, stable operation, relatively simple structure, and convenient air volume adjustment, and therefore play an important role.

[0003] Regarding the aforementioned technologies, most existing centrifugal fans block airborne particles by installing filters at the air inlet. However, when the centrifugal fan is in a windy and dusty environment, ordinary filters are prone to clogging, which increases the resistance when air enters the centrifugal fan through the filter and reduces the intake efficiency. Therefore, improvements are needed. Summary of the Invention

[0004] In order to reduce the probability of blockage at the air inlet of a centrifugal fan, this application provides a centrifugal fan sand filter.

[0005] This application provides a centrifugal fan sand filter, which adopts the following technical solution: A centrifugal fan sand filter includes a housing, one end of which is connected to the air inlet of a centrifugal fan. An air inlet is also provided on the side wall of the housing. An obstruction mechanism is provided on the housing, the obstruction mechanism including a plurality of first obstruction frames and a plurality of second obstruction frames. Each of the first obstruction frames and the second obstruction frames is provided on the housing, and the opening formed by the gap between adjacent first obstruction frames is located on the side of the corresponding second obstruction frame away from the air inlet.

[0006] By adopting the above technical solution, compared with the existing technology that only filters the air inlet by setting a filter screen, which increases the resistance of air entering the centrifugal fan when the centrifugal fan is in a windy and sandy environment, thus reducing the air intake efficiency, this application sets up an obstruction mechanism. When the outside air enters through the opening formed by the gap between the adjacent first obstruction frames, it can come into contact with the second obstruction frame on the side near the air inlet. The second obstruction frame then blocks the outside air particles, allowing them to fall downwards under the action of gravity after colliding with the second obstruction frame. This reduces the probability of outside air particles entering the housing, effectively replacing the filtering function of the filter screen. It can not only block large foreign objects but also block small dust particles. At the same time, it can reduce the probability of the opening formed by the gap between the adjacent first obstruction frames becoming blocked, effectively reducing the resistance of air entering the centrifugal fan, ensuring the air intake efficiency, and is also suitable for long-term use, effectively reducing the frequency of replacement.

[0007] Preferably, the housing is further provided with an adjustment mechanism and an adjustment component. The adjustment mechanism includes a mounting frame and an adjustment frame. The mounting frame is mounted on the housing and located outside the air inlet, and is used to mount the second obstruction frame. The adjustment frame is used to mount the first obstruction frame and is slidably connected to the mounting frame, and the sliding direction is the opening direction of the air inlet. The adjustment component is used to drive the adjustment frame to slide.

[0008] By adopting the above technical solution, the adjustment mechanism is configured such that the adjustment component can slide by driving the adjustment frame, thereby changing the distance between the first and second obstruction frames, and thus changing the gap between the first and second obstruction frames, thereby changing the flow rate of external air entering the box. This allows the present application to adjust the efficiency of external air entering the box according to the environment in which the centrifugal fan is located. In a sandstorm environment, the gap between the first and second obstruction frames can be reduced to decrease the number of particles in the air entering the box.

[0009] Preferably, the number of air inlets is set to several and they are opened on different side walls of the housing, and the number of obstruction mechanisms is set to several and they are arranged one-to-one with the air inlets.

[0010] By adopting the above technical solution and setting multiple air inlets, outside air can enter the chamber from different sides, thereby effectively increasing the efficiency of outside air intake and ensuring the air intake effect of the centrifugal fan.

[0011] Preferably, the adjusting member is used to drive one of the adjusting frames to slide, and each adjusting frame is provided with a linkage frame at one end. One end of each linkage frame is rotatably connected to the corresponding adjusting frame, and the other end is rotatably connected to the corresponding adjacent adjusting frame.

[0012] By adopting the above technical solution and setting the linkage frame, when the adjusting component drives one of its adjusting frames to slide, that adjusting frame can drive the adjacent adjusting frames to slide together through the linkage frame, thereby realizing the driving of each adjusting frame. This effectively reduces the number of adjusting components required, thereby reducing the overall weight of the box and the space required to install the adjusting components, while also facilitating the operation of several adjusting frames.

[0013] Preferably, each of the first barrier frames has a first extension portion that bends towards the air inlet at one end near the adjacent second barrier frame, and each of the second barrier frames has a second extension portion that bends towards the corresponding first barrier frame at both ends.

[0014] By adopting the above technical solution, the arrangement of the first extension and the second extension can obstruct the flow of air entering the gap between the first extensions, making it difficult for the air entering the gap between the first extensions to directly enter the housing, increasing the path for air flow. Furthermore, the first extension and the second extension can obstruct the particles in the air by contacting them, thereby increasing the filtration efficiency.

[0015] Preferably, the bottom wall of the housing is provided with a plurality of flow holes, which are located between each of the first extensions and the corresponding adjacent second extensions.

[0016] By adopting the above technical solution and setting several flow holes, particles and dust that are blocked from falling by the second obstruction frame, the first extension and the second extension can be discharged to the outside of the box through the flow holes, thereby reducing the probability of particles and dust accumulating inside the box and ensuring the effectiveness of this application.

[0017] Preferably, the first obstruction frame includes a main body and two obstruction parts. The main body is disposed on the adjustment frame, and the two obstruction parts are respectively located on opposite sides of the corresponding main body and are slidably connected to the corresponding main body. Each obstruction part is also provided with a driving mechanism, which is used to drive the corresponding obstruction part to slide.

[0018] By adopting the above technical solution and specifically configuring the first obstruction frame, the drive mechanism can drive the corresponding obstruction part to slide, thereby changing the distance between the two obstruction parts, and thus changing the gap between adjacent obstruction parts, thereby adjusting the size of the opening formed by the gap between the first obstruction frames, and thus adjusting the air intake efficiency.

[0019] Preferably, both ends of the second barrier frame are provided with a filtering mechanism, each filtering mechanism including a filter screen and an adapting frame. One end of the filter screen is rotatably connected to the corresponding second barrier frame, and the other end is rotatably connected to the adapting frame. The adapting frame is slidably connected to the corresponding main body.

[0020] By adopting the above technical solution and configuring the filtration mechanism, the filter screen can further filter the air entering between the first and second barrier frames, thereby further reducing the particles and dust in the air. Furthermore, when the first barrier frame slides together with the adjustment frame, the filter screen can rotate relative to the second barrier frame, causing the adaptation frame to slide, thus adapting to changes in the distance between the first and second barrier frames and ensuring the effectiveness of the filter screen.

[0021] Preferably, the adapting frame is arranged parallel to the sliding direction of the corresponding obstruction part, and the driving mechanism includes a reversing gear and two reversing racks. One of the reversing racks is connected to the corresponding obstruction part, and the other reversing rack is connected to the corresponding adapting frame. The reversing gear is located between the two corresponding reversing racks and is rotatably connected to the corresponding body part, and meshes with the corresponding reversing rack.

[0022] By adopting the above technical solution and setting the drive mechanism, when the adapting frame slides, the adapting frame can drive the corresponding obstruction part to slide through the reversing gear and reversing rack, thereby realizing the drive of the obstruction part. At the same time, it also realizes the linkage between the obstruction part and the adjustment frame, thus eliminating the need to set up several additional active devices, thereby reducing the overall weight of the box and the space required to install the active devices, while facilitating the operation of several obstruction frames.

[0023] Preferably, the filter screen includes a frame and a mesh, the frame is rotatably connected to the corresponding second obstruction frame and the corresponding adaptation frame, the top of the frame has an opening, the mesh is inserted into the opening of the frame and is slidably connected to the frame.

[0024] By adopting the above technical solution and specifically designing the filter screen, the screen can be inserted into the frame by means of insertion, so that when the screen needs to be disassembled or replaced, the frame does not need to be disassembled, which effectively facilitates the replacement and disassembly by relevant personnel.

[0025] In summary, this application includes at least one of the following beneficial technical effects: The obstruction mechanism is designed so that when outside air enters through the opening formed by the gap between adjacent first obstruction frames, it can come into contact with the second obstruction frame on the side closer to the air inlet. The second obstruction frame then blocks the outside air particles, causing them to fall downwards under the influence of gravity after colliding with the second obstruction frame. This reduces the probability of outside air particles entering the housing, effectively replacing the filtering function of the filter screen. It can not only block large foreign objects but also block small dust particles. At the same time, it can reduce the probability of the opening formed by the gap between adjacent first obstruction frames becoming blocked, effectively reducing the resistance when air enters the centrifugal fan, ensuring the efficiency of air intake, and is also suitable for long-term use, effectively reducing the frequency of replacement. The adjustment mechanism is designed so that the adjustment component can slide by driving the adjustment frame, thereby changing the distance between the first and second obstruction frames, and thus changing the gap between the first and second obstruction frames, thereby changing the flow rate of external air entering the box. This allows the present application to adjust the efficiency of external air entering the box according to the environment in which the centrifugal fan is located. In a sandy environment, the gap between the first and second obstruction frames can be reduced to reduce the number of particles in the air entering the box. The specific configuration of the first obstruction frame allows the drive mechanism to change the distance between the two obstruction parts by driving the corresponding obstruction parts to slide, thereby changing the gap between adjacent obstruction parts, and thus adjusting the size of the opening formed by the gap between the first obstruction frames, thereby adjusting the intake efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the overall structure of the centrifugal fan sand filter in Embodiment 1 of this application.

[0027] Figure 2 This is a structural schematic diagram of the box in Embodiment 1 of this application.

[0028] Figure 3 This is a schematic diagram illustrating the obstruction mechanism in Embodiment 1 of this application.

[0029] Figure 4 This is a schematic diagram illustrating the overall structure of the centrifugal fan sand filter in Embodiment 2 of this application.

[0030] Figure 5 This is a schematic diagram illustrating the structure of the adjustment mechanism in Embodiment 3 of this application.

[0031] Figure 6 This is a schematic diagram illustrating the structure of the adjustment frame in Embodiment 3 of this application.

[0032] Figure 7 This is a schematic diagram illustrating the structure of the filtration mechanism in Embodiment 3 of this application.

[0033] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Air inlet; 2. Obstruction mechanism; 21. First obstruction frame; 211. Main body; 212. Obstruction part; 22. Second obstruction frame; 221. Second extension part; 3. First extension part; 4. Flow hole; 5. Adjustment mechanism; 51. Mounting frame; 52. Adjustment frame; 53. Linkage frame; 6. Adjustment component; 7. Filtering mechanism; 71. Filter screen; 711. Frame; 712. Mesh body; 72. Adaptor frame; 8. Drive mechanism; 81. Reversing gear; 82. Reversing rack. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0035] Example 1

[0036] Embodiment 1 of this application discloses a centrifugal fan sand filter. (Refer to...) Figure 1 , Figure 2 and Figure 3 The centrifugal fan sand filter includes a housing 1, one end of which is connected to the air inlet of the centrifugal fan. An air inlet 11 is also provided on the side wall of the housing 1. A blocking mechanism 2 is provided on the housing 1, comprising several first blocking frames 21 and several second blocking frames 22. Each first blocking frame 21 and second blocking frame 22 is disposed on the housing 1, and the opening formed by the gap between adjacent first blocking frames 21 is located on the side of the corresponding second blocking frame 22 away from the air inlet 11.

[0037] Reference Figure 1 and Figure 3 In this embodiment, the housing 1 is located above the centrifugal fan and is placed on the ground by a bracket. An opening is also provided through the bottom wall of the housing 1 for connecting to the air inlet of the centrifugal fan via a pipe. Each outer wall of the housing 1 is provided with an air inlet 11, and an obstruction mechanism 2 is provided on the outer side of each air inlet 11.

[0038] Reference Figure 2 and Figure 3Each housing 1 has its top and bottom sides extending outwards to the outside of the air inlet 11. Each first obstruction bracket 21 and second obstruction bracket 22 is fixedly mounted to the outwardly extending portion of the housing 1 by welding or bolting, located outside the corresponding air inlet 11. The section of each first obstruction bracket 21 on each side of the housing 1 near the adjacent second obstruction bracket 22 is bent towards the side closer to the air inlet 11 and extends with a first extension 3. The end of each second obstruction bracket 22 near the adjacent first obstruction bracket 21 is bent away from the side away from the air inlet 11 and extends with a second extension 221.

[0039] Reference Figure 2 and Figure 3 Several flow holes 4 are also provided on the outwardly extending part of the bottom of the box 1. Each flow hole 4 is located on the side of the corresponding first extension 3 near the adjacent second extension 221, or on the side of the second extension 221 near the first extension 3 (i.e., several flow holes (4) are respectively located between the first extension and the corresponding adjacent second extension), so that the particles and dust blocked by the second obstruction frame 22 and the first obstruction frame 21 can pass downward through the flow holes 4.

[0040] Reference Figure 2 In this embodiment of the application, a filter screen is provided on each outer side wall of the box 1. Each filter screen is fixedly installed on the outwardly extending part of the bottom of the box 1 and is located on the side of the first barrier frame 21 away from the second barrier frame 22, so as to block larger particles or debris and reduce the probability that the gap opening between the first barrier frames 21 will be blocked by excessively large debris.

[0041] The implementation principle of the centrifugal fan sand filter in Embodiment 1 of this application is as follows: When outside air enters through the opening formed by the gap between adjacent first obstruction frames 21, it can come into contact with the second obstruction frame 22 on the side near the air inlet 11, and is thus obstructed by the second obstruction frame 22. As a result, the particles in the outside air can fall downward under the action of gravity after colliding with the second obstruction frame 22, thereby reducing the probability of particles in the outside air entering the housing 1. It effectively replaces the filtering function of the filter screen 71, and can not only block large foreign objects, but also block small dust particles. At the same time, it can also reduce the probability of the opening formed by the gap between adjacent first obstruction frames 21 becoming blocked, effectively reducing the resistance when air enters the centrifugal fan, ensuring the efficiency of air intake, and is also suitable for long-term use, effectively reducing the frequency of replacement.

[0042] Example 2

[0043] The difference between Embodiment 2 and Embodiment 1 in this application is that: (Refer to...) Figure 4In this embodiment of the application, an air outlet is provided on one side wall of the housing 1. The air outlet is connected to the air inlet of the centrifugal fan through a pipe. An air inlet 11 is provided on each of the other side walls, and an obstruction mechanism 2 is provided on the outside of each air inlet 11.

[0044] Example 3

[0045] The difference between Embodiment 3 and Embodiment 1 in this application is that: (Refer to...) Figure 5 and Figure 6 The housing 1 is also provided with an adjustment mechanism 5 and an adjustment component 6. In this embodiment, the housing 1 is provided with adjustment mechanisms 5 and adjustment components 6 at both the upper and lower ends, and the number of adjustment mechanisms 5 at each end is set to four, corresponding one-to-one with the four air inlets 11. Each adjustment mechanism 5 includes a mounting frame 51 and an adjustment frame 52. Each mounting frame 51 is fixedly installed at the bottom or top of the housing 1 by bolts or welding, and is located on the outside of the corresponding air inlet 11. Each flow hole 4 is opened through the mounting frame 51 and the adjustment frame 52.

[0046] Reference Figure 5 and Figure 6 Each adjusting bracket 52 is slidably connected to a corresponding mounting bracket 51 via a slide rail, and the sliding direction is set to the width direction of the corresponding mounting bracket 51, i.e., the opening direction of the corresponding air inlet 11. In this embodiment, the adjusting member 6 is set as an electric push rod, which is fixedly installed on one of its mounting brackets 51, and the piston rod is fixedly connected to the adjusting bracket 52 corresponding to the mounting bracket 51 to drive the adjusting bracket 52 to slide.

[0047] Reference Figure 5 Each adjustment frame 52 is provided with a linkage frame 53 at one end. One end of each linkage frame 53 is rotatably connected to the adjustment frame 52 via a pin, and the other end is rotatably connected to the adjacent adjustment frame 52 via a pin, so that transmission can occur between adjacent adjustment frames 52.

[0048] Reference Figure 5 and Figure 7 Each second obstruction bracket 22 on one side of each air inlet 11 is mounted on a corresponding mounting bracket 51, and its bottom end is fixedly connected to the corresponding mounting bracket 51 by welding or bolts. Each first obstruction bracket 21 is mounted on a corresponding adjusting bracket 52, and each first obstruction bracket 21 includes a body part 211 and an obstruction part 212. In this embodiment, the obstruction part 212 on the first obstruction brackets 21 located at both ends of the adjusting bracket 52 is set to one, and the obstruction brackets on the remaining first obstruction brackets 21 are set to two.

[0049] Reference Figure 5 and Figure 7Each main body 211 has its bottom end fixedly connected to the corresponding adjustment frame 52. Each obstruction part 212 is located on the side of the corresponding main body 211 near the second obstruction frame 22, and one end of each part is slidably connected to the corresponding main body 211 via a slide rail, with the sliding direction being the length direction of the main body 211. The other end of each obstruction part 212 extends out of the main body 211, and the first extension part 3 is provided on this end.

[0050] Reference Figure 5 and Figure 7 Each of the second barrier frames 22 is provided with a filter mechanism 7 at both ends. Each filter mechanism 7 includes a filter screen 71 and an adaptation frame 72. Each filter screen 71 includes a frame 711 and a mesh 712. One end of each frame 711 is rotatably connected to the end of the corresponding second barrier frame 22 by a pin, and the other end is rotatably connected to the adaptation frame 72 by a pin.

[0051] Reference Figure 5 and Figure 7 In this embodiment of the application, each frame 711 has two adaptation frames 72, which are located on the upper and lower sides of the corresponding frame 711 respectively. Each adaptation frame 72 is slidably connected to the corresponding body part 211 via a slide rail, and the sliding direction is set parallel to the sliding direction of the corresponding obstruction part 212.

[0052] Reference Figure 5 and Figure 7 Each frame 711 has an opening at its top for inserting a mesh 712. Each mesh 712 is inserted into the opening at the top of the corresponding frame 711 and is slidably connected to the corresponding frame 711, with the sliding direction set to the vertical direction.

[0053] Reference Figure 5 and Figure 7 Each obstruction 212 is provided with a drive mechanism 8, and each drive mechanism 8 includes a reversing gear 81 and two reversing racks 82. One reversing rack 82 is fixedly connected to the corresponding obstruction 212 and extends in the sliding direction of the obstruction 212. The other reversing rack 82 is fixedly connected to the corresponding adaptation frame 72 and extends in the sliding direction of the adaptation frame 72. The reversing gear 81 is located between the two corresponding reversing racks 82 and is rotatably connected to the corresponding body part 211 through a pin, and meshes with the corresponding reversing rack 82.

[0054] Reference Figure 5 , Figure 6 and Figure 7In the initial testing state, when the adjusting frame 52 has not slid outwards from the mounting frame 51, the first extension 3 on the obstruction part 212 is located on the side of its sliding path away from the main body part 211, and the adapting frame 72 is located on the side of its sliding path away from the corresponding second obstruction frame 22. When the adjusting member 6 drives the corresponding adjusting frame 52 away from the mounting frame 51, the adjusting frame 52 drives the adjacent adjusting frame 52 to slide together through the linkage frame 53, thereby causing the adjacent adjusting frame 52 to drive the other adjusting frame 52 to slide.

[0055] During this process, the main body 211 moves away from the second obstruction frame 22 along with the adjustment frame 52, causing the adaptation frame 72 on the main body 211 to slide, thereby causing the frame 711 to rotate to adapt to the change in distance between the main body 211 and the second obstruction frame 22. During this process, the adaptation frame 72 drives the obstruction part 212 to slide through the reversing gear 81 and the reversing rack 82, causing the obstruction parts 212 on the same main body 211 to move closer together, thereby increasing the distance between adjacent second obstruction frames 22 (i.e., the distance between the obstruction parts 212 on adjacent second obstruction frames 22), and making the opening formed by the gap between adjacent second obstruction frames 22 larger.

[0056] The implementation principle of the centrifugal fan sand preventer in Embodiment 3 of this application is as follows: When the adjusting member 6 drives the corresponding adjusting frame 52 away from the setting frame 51, the adjusting frame 52 drives the adjacent adjusting frame 52 to slide together through the linkage frame 53, thereby causing the adjacent adjusting frame 52 to drive another adjusting frame 52 to slide. During this process, the main body 211 moves away from the second obstruction frame 22 along with the adjusting frame 52, thereby causing the adaptation frame 72 on the main body 211 to slide, thereby causing the frame 711 to rotate to adapt to the change in distance between the main body 211 and the second obstruction frame 22.

[0057] During this process, the adapting frame 72 drives the obstruction part 212 to slide through the reversing gear 81 and the reversing rack 82, and makes the obstruction parts 212 on the same body part 211 move closer together, thereby increasing the distance between adjacent second obstruction frames 22 (i.e., the distance between the obstruction parts 212 on adjacent second obstruction frames 22), making the opening formed by the gap between adjacent second obstruction frames 22 larger, realizing the adjustment of the opening, and realizing the adjustment of the distance between the first obstruction frame 21 and the second obstruction frame 22.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sand arrester for a centrifugal fan, characterized by: The device includes a housing (1), one end of which is connected to the air inlet of a centrifugal fan. An air inlet (11) is also provided on the side wall of the housing (1). An obstruction mechanism (2) is provided on the housing (1). The obstruction mechanism (2) includes several first obstruction frames (21) and several second obstruction frames (22). Each first obstruction frame (21) and each second obstruction frame (22) is provided on the housing (1). The opening formed by the gap between adjacent first obstruction frames (21) is located on the side of the corresponding second obstruction frame (22) away from the air inlet (11).

2. A centrifugal fan sand deflector according to claim 1, characterized in that: The housing (1) is also provided with an adjustment mechanism (5) and an adjustment component (6). The adjustment mechanism (5) includes a mounting frame (51) and an adjustment frame (52). The mounting frame (51) is mounted on the housing (1) and located outside the air inlet (11), and is used for mounting the second obstruction frame (22). The adjustment frame (52) is used for mounting the first obstruction frame (21) and is slidably connected to the mounting frame (51), and the sliding direction is the opening direction of the air inlet (11). The adjustment component (6) is used to drive the adjustment frame (52) to slide.

3. A centrifugal fan sand deflector according to claim 2, characterized in that: The number of air inlets (11) is set to several and is opened on different side walls of the housing (1). The number of obstruction mechanisms (2) is set to several and is set one-to-one with the air inlets (11).

4. A centrifugal fan sand deflector according to claim 3, characterized in that: The adjusting member (6) is used to drive one of its adjusting frames (52) to slide. Each adjusting frame (52) is provided with a linkage frame (53) at one end. One end of each linkage frame (53) is rotatably connected to the corresponding adjusting frame (52), and the other end is rotatably connected to the corresponding adjacent adjusting frame (52).

5. A centrifugal fan sand deflector according to claim 1, characterized in that: Each of the first barrier frames (21) has a first extension (3) that bends toward the air inlet (11) at one end near the adjacent second barrier frame (22), and each of the second barrier frames (22) has a second extension (221) that bends toward the corresponding first barrier frame (21) at both ends.

6. A centrifugal fan sand deflector according to claim 2, characterized in that: The bottom wall of the box (1) is also provided with a plurality of flow holes (4), and the plurality of flow holes (4) are respectively located between each of the first extension (3) and the corresponding adjacent second extension (221).

7. A centrifugal fan sand deflector according to claim 1, characterized in that: The first obstruction frame (21) includes a main body (211) and two obstruction parts (212). The main body (211) is disposed on the adjustment frame (52). The two obstruction parts (212) are respectively located on opposite sides of the corresponding main body (211) and are slidably connected to the corresponding main body (211). Each obstruction part (212) is also provided with a driving mechanism (8), which is used to drive the corresponding obstruction part (212) to slide.

8. A centrifugal fan sand deflector according to claim 7, characterized in that: Both ends of the second barrier frame (22) are provided with a filter mechanism (7). Each filter mechanism (7) includes a filter screen (71) and an adaptor frame (72). One end of the filter screen (71) is rotatably connected to the corresponding second barrier frame (22), and the other end is rotatably connected to the adaptor frame (72). The adaptor frame (72) is slidably connected to the corresponding main body (211).

9. A centrifugal fan sand deflector according to claim 8, characterized in that: The adaptation frame (72) is arranged parallel to the sliding direction of the corresponding obstruction part (212). The drive mechanism (8) includes a reversing gear (81) and two reversing racks (82). One of the reversing racks (82) is connected to the corresponding obstruction part (212), and the other reversing rack (82) is connected to the corresponding adaptation frame (72). The reversing gear (81) is located between the two corresponding reversing racks (82) and is rotatably connected to the corresponding body part (211) and meshes with the corresponding reversing rack (82).

10. A centrifugal fan sand filter according to claim 8, characterized in that: The filter screen (71) includes a frame (711) and a mesh (712). The frame (711) is rotatably connected to the second obstruction frame (22) and the adaptation frame (72). The top of the frame (711) has an opening. The mesh (712) is inserted into the opening of the frame (711) and is slidably connected to the frame (711).

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