Centrifugal ventilator with environment-friendly dust suction mechanism

Abstract

The invention belongs to the technical field of centrifugal fans, and particularly discloses a centrifugal fan with an environment-friendly dust suction mechanism, which comprises a shell, an air inlet is formed in the front side surface of the shell, a square frame is mounted on the rear side surface of the shell, a motor is mounted at the top of the square frame, and fan blades are arranged in the shell. The center of the fan blades is in transmission connection with the output end of the motor, an exhaust outlet is formed in one side of the shell and is vertically upward, an exhaust frame is fixed to the position of the exhaust outlet, and an external air pipe communicates with the exhaust frame. The arc-shaped filter screen is rapidly replaced in a sliding clamping mode, the situation that the dust filtering effect becomes poor due to the fact that too much dust is accumulated on the surface of the arc-shaped filter screen is avoided, the filtered dust is accumulated on the surface of the inner concave face of the arc-shaped filter screen, filtered air is discharged into an external air pipe through an exhaust frame, and dust filtering treatment is completed; and the dust is filtered by utilizing the filtering part, so that the environmental protection effect of the environment is improved.

Description

Technical Field

[0001] This invention belongs to the field of centrifugal fan technology, and specifically relates to a centrifugal fan with an environmentally friendly dust removal mechanism. Background Technology

[0002] Centrifugal fans are a type of air machinery, mainly composed of an inlet, a centrifugal impeller, an outlet, and a drive unit. Their working principle involves drawing in outside air into the impeller for accelerated movement, and then expelling it through the outlet, thus creating a powerful airflow. In existing factory ventilation systems, daily ventilation is particularly important in workshops with high dust levels. While centrifugal fans can expel dust, this dust can cause secondary pollution to the external environment, and the particles in the dust can adhere to the filter surface, easily leading to filter clogging over time.

[0003] Therefore, it is necessary to invent a centrifugal fan with an environmentally friendly dust removal mechanism to solve the above problems. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a centrifugal fan with an environmentally friendly dust removal mechanism, thereby solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a centrifugal fan with an environmentally friendly dust removal mechanism, comprising a housing, an air inlet on the front side of the housing, a square frame on the rear side of the housing, a motor on the top of the square frame, fan blades inside the housing, and a motor output terminal connected to the center of the fan blades; an exhaust port on one side of the housing, the exhaust port being vertically upward, and an exhaust frame fixed at the exhaust port position; an external air duct communicating with the exhaust frame; side frames at the four corners of the exhaust port, and support frames supporting the side frames on the exhaust frames; two opposing side plates inside the exhaust port, with an arc-shaped plate corresponding to the side frame fixed on the top surface of the side plate, the concave surface of the arc-shaped plate fitting against the arc-shaped surface of the side frame; the side plates and the two arc-shaped plates forming a bracket; a filter component between the two brackets, the filter component including an arc-shaped filter screen, which filters the air discharged from the exhaust port, and the bracket using a pressing component to limit the end of the arc-shaped filter screen.

[0006] Furthermore, two opposing diagonal rods are provided inside the side frame, and the two side frames of the bracket are arranged opposite each other. A collar is sleeved on the surface of the diagonal rod, and a protruding rod penetrating the arc plate is fixed on the outer circumference of the collar. A first spring is sleeved on the surface of the protruding rod, one end of the first spring is connected to the collar, and the other end of the first spring is connected to the outer concave surface of the arc plate.

[0007] Furthermore, a second spring is provided between the two side frames of the bracket, with the end of the second spring connected to the inner end of the protruding rod, and the second spring is in a contracted state.

[0008] Furthermore, the second spring has curved strips on both sides, with the ends of the curved strips sleeved on the surface of the protruding rod, and the two curved strips cooperate to define the arc-shaped filter screen.

[0009] Furthermore, the extrusion component includes a rotating plate, the bottom end of which is hinged to the top surface of the inner side of the side plate. A slot is provided at the top of the rotating plate. Side rods are fixed at both ends of the arc-shaped filter screen. The side rods are slidably engaged in the slots at the top of the rotating plate. The top of the outer side of the rotating plate is connected to the outer ends of two protruding rods by an arc-shaped piece made of rubber material.

[0010] Furthermore, the filter component includes a base rod positioned between two rotating plates. A retaining edge is provided on the inner side of the rotating plate, and an insert rod is fixed to the inner side of the retaining edge. A rotating plate is provided between the base rod and the insert rod. The top end of the rotating plate is sleeved on the surface of the insert rod, and the bottom end of the rotating plate is sleeved on the surface of the base rod. The bottom ends of the two rotating plates are misaligned. A nut is provided at the end of the base rod to limit the rotating plate, and the outer side of the nut is in contact with the inner side of the rotating plate.

[0011] Furthermore, a V-shaped frame is sleeved at the end of the bottom rod. The V-shaped frame is made of rubber material, and multiple limiting rods are fixed on the outer side of the rotating plate. The surface of the V-shaped frame is provided with inclined grooves corresponding to the limiting rods.

[0012] Furthermore, the support frame includes a top plate, the bottom surface of the inner end of the top plate is connected to the top surface of the side frame by a connecting rod, and a vertical rod that penetrates the exhaust frame is fixed to the bottom surface of the outer end of the top plate. An elastic element is sleeved on the surface of the vertical rod, and a circular plate is provided at the bottom end of the vertical rod. The top end of the elastic element is connected to the bottom surface of the exhaust frame, and the bottom end of the elastic element is connected to the top surface of the circular plate.

[0013] The technical effects and advantages of this invention are as follows: 1. This invention allows for quick replacement of the arc-shaped filter screen via a sliding snap-fit ​​mechanism, preventing excessive dust accumulation on the surface of the arc-shaped filter screen and thus reducing its filtration efficiency. The filtered dust accumulates on the concave surface of the arc-shaped filter screen, and the filtered air is discharged into the external duct through the exhaust frame, completing the dust filtration process and preventing dust from scattering. By using the filter components to filter dust, the environmental protection effect is improved.

[0014] 2. The present invention utilizes the elastic force of the first spring and the second spring to facilitate the limiting of the collar on the surface of the inclined rod by the protruding rod, thereby preventing the collar from moving upward rapidly on the surface of the inclined rod. Furthermore, the first spring and the second spring ensure that the inner wall of the collar fits tightly against the surface of the inclined rod, preventing the bracket from moving downward rapidly and preventing collision damage between the bottom surface of the collar and the inner side of the side frame.

[0015] 3. This invention utilizes a V-shaped frame to prevent the rotating plate from shifting during rotation. The rotating plate causes the arc-shaped filter to bend until the outer convex surface of the arc-shaped filter fits against the inner concave surface of the bending strip. The bending strip limits the arc-shaped filter, preventing folding damage to the arc-shaped filter and avoiding the gradual folding damage to the arc-shaped filter caused by the shifting plate. Attached Figure Description

[0016] Figure 1 This is an overall schematic diagram of a centrifugal fan with an environmentally friendly dust removal mechanism according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the inner side of the exhaust frame according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal components of the exhaust frame according to an embodiment of the present invention; Figure 4 This is an embodiment of the present invention. Figure 3 Enlarged view of part A in the diagram; Figure 5 This is a schematic diagram showing the correspondence between the V-shaped frame and the base rod in an embodiment of the present invention; In the diagram: 1. Housing; 2. Air inlet; 3. Square frame; 4. Motor; 5. Exhaust frame; 6. Side frame; 7. Side plate; 8. Curved plate; 9. Curved filter; 10. Diagonal rod; 11. Collar; 12. Protruding rod; 13. First spring; 14. Second spring; 141. Bending strip; 15. Rotating plate; 16. Side rod; 17. Curved piece; 18. Bottom rod; 19. Edge clamp; 20. Rotating piece; 21. Nut; 22. V-shaped frame; 23. Limiting rod; 24. Top plate; 25. Vertical rod; 26. Elastic element. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0018] This invention provides a centrifugal fan with an environmentally friendly dust removal mechanism, such as... Figures 1 to 3As shown, the device includes a housing 1, an air inlet 2 on the front side of the housing 1, a square frame 3 on the rear side of the housing 1, a motor 4 on the top of the square frame 3, a fan blade inside the housing 1, and a drive connection at the center of the fan blade to the output end of the motor 4. An exhaust port is located on one side of the housing 1, pointing vertically upwards, and an exhaust frame 5 is fixed at the exhaust port position. An external air duct connects to the exhaust frame 5. Side frames 6 are located at the four corners of the exhaust port, and support frames for supporting the side frames 6 are provided on the exhaust frame 5. Two opposing side plates 7 are located inside the exhaust port. An arc-shaped plate 8 corresponding to the side frame 6 is fixed to the top surface of the side plate 7, and the concave surface of the arc-shaped plate 8 fits against the arc-shaped surface of the side frame 6. The side plates 7 and the two arc-shaped plates 8 cooperate to form a support. A filter component is located between the two supports. The filter component includes an arc-shaped filter screen 9, which filters the air discharged from the exhaust port. The support uses a pressing component to limit the end of the arc-shaped filter screen 9. The arc-shaped filter screen 9 of the filter component blocks the exhaust port. The motor 4 is started, and the fan blades at the output end of the motor 4 rotate inside the housing 1. The rotating fan blades bring external dust into the housing 1 through the air inlet 2. When the external dust passes through the exhaust port, the arc-shaped filter screen 9 of the filter component works to filter the dust. The filtered dust accumulates on the concave surface of the arc-shaped filter screen 9. The filtered air is discharged into the external air duct through the exhaust frame 5, completing the dust filtration process and preventing dust from scattering. By using the filter component to filter dust, the environmental protection effect is improved.

[0019] exist Figures 2 to 4 In the bracket, two opposing diagonal braces 10 are provided inside the side frame 6. The two side frames 6 of the bracket are arranged opposite each other. A collar 11 is sleeved on the surface of the diagonal brace 10. A protruding rod 12 penetrating the arc-shaped plate 8 is fixed to the outer circumference of the collar 11. A first spring 13 is sleeved on the surface of the protruding rod 12. One end of the first spring 13 is connected to the collar 11, and the other end of the first spring 13 is connected to the outer concave surface of the arc-shaped plate 8. A second spring 14 is provided between the two side frames 6 of the bracket. The end of the second spring 14 is connected to the inner end of the protruding rod 12, and the second spring 14 is in a contracted state. When the wind blows the support upward, the upward-moving support uses the arc plate 8 to drive the protruding rod 12 to move upward synchronously. The upward-moving protruding rod 12 drives the collar 11 to move upward on the surface of the inclined rod 10. Due to the inclined setting of the inclined rod 10, the upward-moving collar 11 causes the protruding rod 12 to gradually move out from the inside of the arc plate 8 under the constraint of the inclined rod 10. The moving collar 11 cooperates with the arc plate 8 to press the corresponding first spring 13. At this time, the two protruding rods 12 of the support cooperate to press the second spring 14. Through the elastic force of the first spring 13 and the second spring 14, the protruding rod 12 can easily limit the collar 11 on the surface of the inclined rod 10, preventing the collar 11 from moving upward quickly on the surface of the inclined rod 10, and preventing the collar 11 from colliding and being damaged by the inner top surface of the side frame 6 due to excessive wind force.

[0020] When the wind disappears, the weight of the support itself causes the concave surface of the arc plate 8 to move downward on the arc surface of the side frame 6. The elastic force of the first spring 13 and the second spring 14 causes the collar 11 to gradually move away from the arc plate 8 during the downward movement. The first spring 13 and the second spring 14 also make the inner wall of the collar 11 fit tightly against the surface of the diagonal bar 10, preventing the support from moving downward quickly and preventing the bottom surface of the collar 11 from colliding and being damaged by the bottom surface of the inner side of the side frame 6.

[0021] exist Figure 2 and Figure 3 In the second spring 14, both sides are provided with bent strips 141, the ends of which are sleeved on the surface of the protruding rods 12. The two bent strips 141 cooperate to define the arc-shaped filter screen 9. When the support moves upward, the moving support uses the protruding rods 12 to drive the bent strips 141 to move upward synchronously, and the moving support also drives the arc-shaped filter screen 9 to move upward synchronously. The extrusion component includes a rotating plate 15, the bottom end of which is hinged to the top surface of the inner side of the side plate 7. The top of the rotating plate 15 is provided with a slot. Both ends of the arc-shaped filter screen 9 are fixed with side rods 16, which are slidably engaged in the slot at the top of the rotating plate 15. The top of the outer side of the rotating plate 15 is connected to the outer ends of the two protruding rods 12 by an arc-shaped piece 17, which is made of rubber material. When the support and the arc-shaped filter 9 move upward synchronously under the action of wind, the collar 11 is constrained by the diagonal rod 10. The upward-moving collar 11 slides on the surface of the diagonal rod 10, causing the protruding rod 12 to move out from inside the arc-shaped plate 8. That is, the protruding rod 12 gradually approaches the top of the rotating plate 15. The inner end of the protruding rod 12 presses against the arc-shaped piece 17. The arc-shaped piece 17 deforms under pressure. The elastic force of the deformed arc-shaped piece 17 is applied to the top of the rotating plate 15. Under the elastic force of the arc-shaped piece 17, the rotating plate 15 rotates on the top of the side plate 7. The rotating plate 15 is pressed by the side rod 16 to compress the arc-shaped filter screen 9. At this time, the distance between the tops of the two rotating plates 15 gradually decreases, and the airflow through the arc-shaped filter screen 9 gradually increases. The gradually bending arc-shaped filter screen 9 fully contacts the dust in the exhaust port until the outer convex surface of the arc-shaped filter screen 9 fits against the inner concave surface of the bending strip 141. At this time, the distance between the tops of the two rotating plates 15 is the smallest, the degree of bending of the arc-shaped filter screen 9 is the largest, and the bending strip 141 limits the arc-shaped filter screen 9 to prevent the arc-shaped filter screen 9 from folding and being damaged.

[0022] exist Figure 3 and Figure 5In this filter assembly, a base rod 18 is positioned between two rotating plates 15. A retaining edge 19 is provided on the inner side of each rotating plate 15, and an insert rod is fixed to the inner side of the retaining edge 19. A rotating plate 20 is positioned between the base rod 18 and the insert rod. The top end of the rotating plate 20 is sleeved on the surface of the insert rod, and the bottom end of the rotating plate 20 is sleeved on the surface of the base rod 18, with the bottom ends of the two rotating plates 20 staggered. A nut 21 is provided at the end of the base rod 18 to limit the rotating plate 20, and the outer side of the nut 21 is in contact with the inner side of the rotating plate 20. A V-shaped frame 22, made of rubber, is sleeved at the end of the base rod 18. Multiple limiting rods 23 are fixed to the outer side of the rotating plate 20, and the surface of the V-shaped frame 22 has inclined grooves corresponding to the limiting rods 23. When the rotating plate 15 rotates, the rotating plate 15 uses the insert rod on the inner side of the clamp 19 to move the top of the rotating piece 20. Since the bottom end of the rotating piece 20 rotates and is sleeved on the surface of the bottom rod 18, the bottom end of the rotating piece 20 causes the bottom rod 18 to move down between the two rotating plates 15. At the same time, the rotating piece 20 uses multiple limiting rods 23 to twist the rubber V-shaped frame 22. The angle between the two side pieces of the V-shaped frame 22 gradually decreases. The V-shaped frame 22 is used to prevent the rotating plate 15 from shifting during rotation, and to prevent the arc-shaped filter screen 9 from gradually folding and being damaged due to the shift of the rotating plate 15.

[0023] Before placing the arc-shaped filter 9, the two rotating plates 15 are set opposite each other. The bottom rod 18 carrying the rotating plate 20 is placed between the two rotating plates 15. The top of the rotating plate 20 is sleeved on the insert rod surface on the inner side of the clamp 19, and the V-shaped frame 22 is placed on the end of the bottom rod 18. The nut 21 is turned, and the rotating nut 21 pushes the bottom end of the rotating plate 20 to move on the surface of the bottom rod 18. The moving rotating plate 20 pushes the V-shaped frame 22 to move. The limiting rod 23 is gradually inserted into the inclined groove of the V-shaped frame 22 until the rotating plate 20 pushes the outer side of the V-shaped frame 22 to fit against the inner wall of the exhaust port. Then, the other nut 21 is used to fit the outer end of the V-shaped frame 22 at the other end of the bottom rod 18 against the inner wall of the exhaust port. At this time, the two rubber V-shaped frames 22 cooperate to limit the rotating plate 15 and prevent the rotating plate 15 from rotating and shifting.

[0024] exist Figures 1 to 4In the support frame, there is a top plate 24. The bottom surface of the inner end of the top plate 24 is connected to the top surface of the side frame 6 by a connecting rod. A vertical rod 25 that penetrates the exhaust frame 5 is fixed to the bottom surface of the outer end of the top plate 24. An elastic element 26 is sleeved on the surface of the vertical rod 25. A circular plate is provided at the bottom end of the vertical rod 25. The top end of the elastic element 26 is connected to the bottom surface of the exhaust frame 5, and the bottom end of the elastic element 26 is connected to the top surface of the circular plate. Pulling the top plate 24 upwards causes the vertical rod 25 to move upwards inside the exhaust frame 5. The upward-moving vertical rod 25 uses a circular plate to press against the elastic element 26 on its surface. The upward-moving top plate 24 uses a connecting rod to pull the side frame 6 upwards. At this time, the bottom surface of the collar 11 is in contact with the bottom surface of the inner side of the side frame 6. The upward-moving side frame 6 uses the protruding rod 12 to make the bracket move upwards synchronously. The upward-moving bracket uses the rotating plate 15 to make the arc-shaped filter 9 move upwards synchronously. When the arc-shaped filter 9 moves to the outside of the exhaust frame 5, it pushes the arc-shaped filter 9 to move. The moving arc-shaped filter 9 slides inside the slot at the top of the rotating plate 15 using the side rod 16 until the side rod 16 separates from the slot. Remove the arc-shaped filter 9, which has been filtering dust for a long time, from the inside of the exhaust port. Align the side rod 16 at the end of the new arc-shaped filter 9 with the slot and push the side rod 16 into the slot until both ends of the arc-shaped filter 9 are in contact with the inner wall of the exhaust port. Release the tension applied to the top plate 24. The bracket and the arc-shaped filter 9 move down inside the exhaust frame 5 until the arc-shaped filter 9 moves down into the exhaust port. The moving side frame 6 uses the connecting rod to pull the top plate 24 down. The moving top plate 24 uses the vertical rod 25 to drive the circular plate to pull the elastic element 26. The elasticity of the elastic element 26 absorbs the impact force of the bracket moving down, avoiding collision damage between the top plate 24 and the inner wall of the exhaust port.

[0025] The curved filter 9 can be quickly replaced by sliding snap-fit, which avoids excessive dust accumulation on the surface of the curved filter 9, which would reduce the dust filtration effect.

[0026] Working principle of this invention: Reference Figures 1 to 5 As shown, the arc-shaped filter screen 9 of the filter component blocks the exhaust port. The motor 4 is started, and the fan blades at the output end of the motor 4 rotate inside the housing 1. The rotating fan blades bring external dust into the housing 1 through the air inlet 2. When the external dust passes through the exhaust port, the arc-shaped filter screen 9 of the filter component works to filter the dust. The filtered dust accumulates on the concave surface of the arc-shaped filter screen 9. The filtered air is discharged into the external air duct through the exhaust frame 5, completing the dust filtration process and preventing dust from scattering. By using the filter component to filter dust, the environmental protection effect is improved.

[0027] When the arc-shaped filter 9 filters dust, the wind blows the support upward. The upward-moving support uses the arc-shaped plate 8 to drive the protruding rod 12 to move upward synchronously. The upward-moving protruding rod 12 drives the collar 11 to move upward on the surface of the inclined rod 10. Due to the inclined setting of the inclined rod 10, the upward-moving collar 11 causes the protruding rod 12 to gradually move out from the inside of the arc-shaped plate 8 under the constraint of the inclined rod 10. The moving collar 11 cooperates with the arc-shaped plate 8 to press the corresponding first spring 13. At this time, the two protruding rods 12 of the support cooperate to press the second spring 14. Through the elastic force of the first spring 13 and the second spring 14, the protruding rod 12 can easily limit the collar 11 on the surface of the inclined rod 10, preventing the collar 11 from moving upward quickly on the surface of the inclined rod 10, and preventing the collar 11 from colliding and being damaged by the inner top surface of the side frame 6 due to excessive wind force.

[0028] The outwardly moving protruding rod 12 gradually approaches the top of the rotating plate 15. The inner end of the protruding rod 12 presses against the arc-shaped piece 17. The arc-shaped piece 17 deforms under pressure, and the elastic force of the arc-shaped piece 17 is applied to the top of the rotating plate 15. The rotating plate 15 rotates on the top of the side plate 7 under the elastic force of the arc-shaped piece 17. The two rotating plates 15 rotating in opposite directions use the side rod 16 to press against the arc-shaped filter screen 9. At this time, the distance between the tops of the two rotating plates 15 gradually decreases, and the airflow through the arc-shaped filter screen 9 gradually increases. The gradually bending arc-shaped filter screen 9 fully contacts the dust in the exhaust port until the outer convex surface of the arc-shaped filter screen 9 is in contact with the inner concave surface of the bending strip 141. At this time, the distance between the tops of the two rotating plates 15 is the smallest, and the degree of bending of the arc-shaped filter screen 9 is the largest. The bending strip 141 limits the arc-shaped filter screen 9 to prevent the arc-shaped filter screen 9 from folding and being damaged.

[0029] When the rotating plate 15 rotates, the rotating plate 15 uses the insert rod on the inner side of the clamp 19 to move the top of the rotating piece 20. Since the bottom end of the rotating piece 20 rotates and is sleeved on the surface of the bottom rod 18, the bottom end of the rotating piece 20 causes the bottom rod 18 to move down between the two rotating plates 15. At the same time, the rotating piece 20 uses multiple limiting rods 23 to twist the rubber V-shaped frame 22. The angle between the two side pieces of the V-shaped frame 22 gradually decreases. The V-shaped frame 22 is used to prevent the rotating plate 15 from shifting during rotation, and to prevent the arc-shaped filter screen 9 from gradually folding and being damaged due to the shift of the rotating plate 15.

[0030] When the wind disappears, the weight of the support itself causes the concave surface of the arc plate 8 to move downward on the arc surface of the side frame 6. The elastic force of the first spring 13 and the second spring 14 causes the collar 11 to gradually move away from the arc plate 8 during the downward movement. The first spring 13 and the second spring 14 also make the inner wall of the collar 11 fit tightly against the surface of the diagonal bar 10, preventing the support from moving downward quickly and preventing the bottom surface of the collar 11 from colliding and being damaged by the bottom surface of the inner side of the side frame 6.

[0031] Pulling the top plate 24 upwards causes the vertical rod 25 to move upwards inside the exhaust frame 5. The upward-moving vertical rod 25 uses a circular plate to press against the elastic element 26 on its surface. The upward-moving top plate 24 uses a connecting rod to pull the side frame 6 upwards. At this time, the bottom surface of the collar 11 is in contact with the bottom surface of the inner side of the side frame 6. The upward-moving side frame 6 uses the protruding rod 12 to make the bracket move upwards synchronously. The upward-moving bracket uses the rotating plate 15 to make the arc-shaped filter 9 move upwards synchronously. When the arc-shaped filter 9 moves to the outside of the exhaust frame 5, it pushes the arc-shaped filter 9 to move. The moving arc-shaped filter 9 slides inside the slot at the top of the rotating plate 15 using the side rod 16 until the side rod 16 separates from the slot. Remove the arc-shaped filter 9, which has been filtering dust for a long time, from the inside of the exhaust port. Align the side rod 16 at the end of the new arc-shaped filter 9 with the slot and push the side rod 16 into the slot until both ends of the arc-shaped filter 9 are in contact with the inner wall of the exhaust port. Release the tension applied to the top plate 24. The bracket and the arc-shaped filter 9 move down inside the exhaust frame 5 until the arc-shaped filter 9 moves down into the exhaust port. The moving side frame 6 uses the connecting rod to pull the top plate 24 down. The moving top plate 24 uses the vertical rod 25 to drive the circular plate to pull the elastic element 26. The elasticity of the elastic element 26 absorbs the impact force of the bracket moving down, avoiding collision damage between the top plate 24 and the inner wall of the exhaust port.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A centrifugal fan with an environmentally friendly dust suction mechanism, comprising a housing (1), an air inlet (2) being arranged on the front side of the housing (1), a square frame (3) being installed on the rear side of the housing (1), a motor (4) being installed on the top of the square frame (3), a fan blade being arranged inside the housing (1), and the center of the fan blade being transmission-connected to the output end of the motor (4), characterized in that: An exhaust port is arranged on one side of the shell (1), the exhaust port is vertically upward, and an exhaust frame (5) is fixed at the position of the exhaust port, the external air duct is connected to the exhaust frame (5), side frames (6) are arranged at the four corners of the exhaust port, a support frame for supporting the side frames (6) is arranged on the exhaust frame (5), two opposite side panels (7) are arranged inside the exhaust port, an arc-shaped plate (8) corresponding to the side frame (6) is fixed on the top surface of the side panel (7), the outer concave surface of the arc-shaped plate (8) is in contact with the arc-shaped surface of the side frame (6), the side panel (7) and the two arc-shaped plates (8) cooperate to form a bracket, and a filtering component is arranged between the two brackets, the filtering component comprises an arc-shaped filter screen (9), the arc-shaped filter screen (9) is used to filter the air discharged from the exhaust port, and the bracket uses an extrusion component to limit the end of the arc-shaped filter screen (9).

2. The centrifugal fan with an environmentally friendly dust suction mechanism according to claim 1, characterized in that: Two opposing oblique rods (10) are arranged inside the side frame (6), and the two side frames (6) of the bracket are arranged opposite to each other. A collar (11) is sleeved on the surface of the oblique rod (10), and a convex rod (12) penetrating the arc-shaped plate (8) is fixed on the outer circumferential surface of the collar (11). A first spring (13) is sleeved on the surface of the convex rod (12), and one end of the first spring (13) is connected to the collar (11), and the other end of the first spring (13) is connected to the outer concave surface of the arc-shaped plate (8).

3. The centrifugal fan with an environmentally friendly dust suction mechanism according to claim 2, characterized in that: A second spring (14) is arranged between the two side frames (6) of the bracket, the end of the second spring (14) is connected to the inner end of the protruding rod (12), and the second spring (14) is in a contracted state.

4. The centrifugal fan with an environmentally friendly dust suction mechanism according to claim 3, characterized in that: The second spring (14) is provided with bent bars (141) on both sides, the ends of the bent bars (141) are sleeved on the surface of the convex rod (12), and the two bent bars (141) cooperate to define the arc-shaped filter screen (9).

5. The centrifugal fan with an environmentally friendly dust suction mechanism according to claim 2, characterized in that: The extrusion component comprises a rotating plate (15), the bottom end of the rotating plate (15) is hinged to the top surface of the inner end of the side plate (7), the top end of the rotating plate (15) is provided with a slot, both ends of the arc-shaped filter screen (9) are fixed with side rods (16), the side rods (16) are slidably engaged in the slots at the top end of the rotating plate (15), and the top of the outer side surface of the rotating plate (15) is connected to the outer ends of the two protruding rods (12) by means of an arc-shaped sheet (17), and the arc-shaped sheet (17) is made of rubber material.

6. The centrifugal fan with an environmentally friendly dust suction mechanism according to claim 1, characterized in that: The filter component comprises a bottom rod (18), the bottom rod (18) being located between two rotating plates (15), a clamping edge (19) being provided on the inner side of the side edge of the rotating plate (15), an insertion rod being fixed on the inner side of the clamping edge (19), a rotating piece (20) being provided between the bottom rod (18) and the insertion rod, the top end of the rotating piece (20) being sleeved on the surface of the insertion rod, the bottom end of the rotating piece (20) being sleeved on the surface of the bottom rod (18), and the bottom ends of the two rotating pieces (20) being staggered, and a nut (21) for limiting the rotating piece (20) being provided at the end of the bottom rod (18), the outer side surface of the nut (21) being in contact with the inner side surface of the rotating piece (20).

7. The centrifugal fan with an environmentally friendly dust suction mechanism according to claim 6, characterized in that: The end of the bottom rod (18) is sleeved with a V-shaped frame (22), the V-shaped frame (22) is made of rubber material, a plurality of limiting rods (23) are fixed to the outer side surface of the rotating plate (20), and the surface of the V-shaped frame (22) is provided with oblique grooves corresponding to the limiting rods (23).

8. The centrifugal fan with an environmentally friendly dust suction mechanism according to claim 1, characterized in that: The support frame comprises a top plate (24), the bottom surface of the inner end of the top plate (24) being connected to the top surface of the side frame (6) by means of a connecting rod, a vertical rod (25) penetrating the exhaust frame (5) being fixed to the bottom surface of the outer end of the top plate (24), an elastic member (26) being sleeved on the surface of the vertical rod (25), a circular plate being arranged at the bottom end of the vertical rod (25), the top end of the elastic member (26) being connected to the bottom surface of the exhaust frame (5), and the bottom end of the elastic member (26) being connected to the top surface of the circular plate.

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