Centrifugal fan for dust removal

Abstract

The application relates to the technical field of centrifugal fans, and discloses a centrifugal fan for dust removal, which is used to solve the problem of impeller vibration caused by different dust adhered to blades. When a variable-frequency motor drives the impeller to rotate at a high speed, centrifugal cleaning rods on the impeller generate centrifugal force, the centrifugal cleaning rods slide to the outer edges of the blades under the action of the centrifugal force, so that the centrifugal cleaning rods clean the side walls on both sides of the blades, the uneven weight of the dust adhered to the blades is prevented, the impeller vibration is avoided, and the noise pollution is reduced. When the centrifugal cleaning rods move under the action of the centrifugal force, the transmission gears mesh with the power gears to drive the centrifugal cleaning rods to rotate, so that the centrifugal cleaning rods strengthen the cleaning of the blades on both sides, the cleaning disc and the bristles are driven to rotate, the inner wall of the outer pipeline box body is cleaned, and the inner wall of the outer pipeline box body is prevented from being corroded due to long-time retention of impurities.

Description

Technical Field

[0001] This application relates to the field of centrifugal fan technology, and more particularly to a centrifugal fan for dust removal. Background Technology

[0002] A residential central fresh air system is an integrated ventilation and air exchange device that filters outdoor air through ducts and delivers it to various rooms within the home, while simultaneously expelling stale indoor air. It achieves 24-hour continuous ventilation, heat recovery for energy saving, and air purification. A typical residential central fresh air system includes a ducted centrifugal fan, a duct system, a filtration system, and a control system. The ducted centrifugal fan delivers outside air to the filtration system for dust removal and purification, before the air is distributed to various areas of the home through the duct system.

[0003] Among them, the duct centrifugal fan includes an outer duct box, a variable frequency motor and an impeller. Since the unfiltered outside air will be covered with a lot of dust, some of the dust in the air will adhere to the blades when the outside air is directly transported through the impeller. When the amount of dust on several blades is different, the mass of each blade will be different. When the variable frequency motor drives the entire impeller to rotate, the impeller will vibrate, increasing noise pollution. Summary of the Invention

[0004] This application proposes a centrifugal fan for dust removal, which has the advantage of preventing dust of different masses from adhering to the blades, thereby solving the problem of impeller vibration caused by different dust adhering to the blades.

[0005] To achieve the above objectives, this application adopts the following technical solution: a centrifugal fan for dust removal, comprising an outer duct housing, a variable frequency motor, and an impeller. The outer duct housing includes a partition plate, an inlet sealing plate, and an outlet sealing plate. The impeller includes: a disc, fixedly mounted on the drive shaft of the variable frequency motor at its center; several blades, arrayed and connected to the side of the disc near the variable frequency motor; a cover, fixedly connected to the other end of the blades; a movable groove, formed on the disc and cover tightly against the end face of the blades; a centrifugal cleaning rod, with both ends movably inserted into the movable groove near the center line of the disc, for cleaning the blades; and a sealing elastic cloth, slidably mounted on the outer end face of the disc and cover, for closing the movable groove and pulling the centrifugal cleaning rod back to its original position.

[0006] Furthermore, several power teeth are fixedly installed on the side walls of the two moving slots that are close to each other, and transmission gears are fixedly sleeved at both ends of the centrifugal cleaning rod, and the transmission gears mesh with the power teeth.

[0007] Furthermore, the centrifugal cleaning rod includes: an outer cleaning rod, which is a hollow tubular structure with its outer end face tightly attached to the blades; a movable rod, which is slidably installed at both ends inside the outer cleaning rod; a tension spring, which is fixedly connected to the opposing surfaces of the two movable rods; a transmission gear, which is fixedly sleeved on the end of the movable rod extending out of the outer cleaning rod; a cleaning disc is fixedly connected to the end of the movable rod, and a brush is fixedly connected to the end of the cleaning disc away from the movable rod, with the brush bristles tightly attached to the inner wall of the outer pipe box.

[0008] Furthermore, the moving groove has an inclined groove at the end near the edge of the wheel disc and wheel cover.

[0009] Furthermore, the tension spring is always in a stretched state, and its two ends are fixedly connected to the moving rods on both sides.

[0010] Furthermore, a storage groove is formed on the end face of the blade near the edge, and the end of the moving groove near the storage groove is arc-shaped.

[0011] Furthermore, the cleaning disc has several insertion holes, a scraper is sleeved on the outside of the cleaning disc, the bristles of the cleaning disc penetrate the scraper, several insertion posts are fixedly connected to the side of the scraper near the cleaning disc, the insertion posts are movably inserted into the insertion holes, and the scraper is movably disposed inside the closed elastic cloth.

[0012] Furthermore, the closed elastic cloth located between the scraper and the variable frequency motor drive shaft is elastic, and the elasticity of the closed elastic cloth is used to pull the scraper, cleaning disc and centrifugal cleaning rod back to their original positions.

[0013] This application has the following beneficial effects:

[0014] 1. The centrifugal fan for dust removal provided in this application generates centrifugal force by driving the impeller to rotate at high speed by a variable frequency motor. Under the action of centrifugal force, the centrifugal cleaning rod slides towards the outer edge of the blade, thereby cleaning the side walls on both sides of the blade by the centrifugal cleaning rod, preventing uneven weight of dust on the blade, which would cause the impeller to vibrate, thereby reducing noise pollution.

[0015] 2. The centrifugal fan for dust removal provided in this application rotates the centrifugal cleaning rod by meshing the transmission gear and the power gear when the centrifugal cleaning rod moves under the action of centrifugal force, thereby strengthening the cleaning of both sides of the blades.

[0016] 3. The centrifugal fan for dust removal provided in this application, during the rotation of the centrifugal cleaning rod, the moving rod of the centrifugal cleaning rod drives the cleaning disc and brush to rotate on their own axis. At the same time, the impeller drives the cleaning disc and brush to revolve around the central axis. Under the action of the rotation and revolution of the cleaning disc and brush, the cleaning disc cleans the inner wall of the outer pipe box, preventing impurities from remaining on the inner wall of the outer pipe box for a long time, which would cause the inner wall of the outer pipe box to be corroded.

[0017] 4. The centrifugal fan for dust removal provided in this application, during the process of the centrifugal cleaning rod sliding to the outer edge of the blade, the cleaning disc slides into the inclined groove, while the scraper remains in close contact with the wheel disc and the side wall of the wheel cover, so that the bristles on the cleaning disc are scraped by the scraper, thereby cleaning the impurities on the bristles and preventing the residual impurities on the bristles from affecting the next cleaning of the inner wall of the external duct box. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0019] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the outer pipe box of the present invention;

[0022] Figure 3 This is a schematic diagram of the impeller structure of the present invention;

[0023] Figure 4 This is a partial cross-sectional view of the impeller of the present invention;

[0024] Figure 5 This is a partial structural diagram of the roulette wheel of the present invention;

[0025] Figure 6 For the present invention Figure 5 Enlarged view of the local structure at point A;

[0026] Figure 7 This is a schematic diagram of the internal structure of the centrifugal cleaning rod of the present invention;

[0027] Figure 8 For the present invention Figure 7 A schematic diagram of the partial structure at point B in the middle;

[0028] Figure 9 This is a schematic diagram of the cleaning disc and scraper disc of the present invention.

[0029] In the diagram: 1. Outer pipe housing; 11. Divider plate; 12. Inlet sealing plate; 13. Outlet sealing plate; 2. Variable frequency motor; 3. Impeller; 31. Wheel disc; 32. Blade; 321. Storage tank; 33. Wheel cover; 34. Moving groove; 341. Power gear; 342. Inclined groove; 35. Centrifugal cleaning rod; 351. Cleaning outer rod; 352. Moving rod; 353. Tension spring; 355. Transmission gear; 36. Cleaning disc; 361. Brush bristles; 362. Insertion hole; 37. Scraper disc; 371. Insertion column; 38. Sealing elastic cloth. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] Please see Figure 1 and Figure 2 A centrifugal fan for dust removal includes an outer duct housing 1, a variable frequency motor 2, and an impeller 3. A partition plate 11 is fixedly installed in the middle of the outer duct housing 1, dividing the outer duct housing 1 into two spaces. The variable frequency motor 2 is fixedly installed on the inner wall of one space of the outer duct housing 1, and the impeller 3 is provided in the other space of the outer duct housing 1. The drive shaft of the variable frequency motor 2 is fixedly connected to the shaft of the impeller 3. The variable frequency motor 2 is used to drive the impeller 3 to rotate at high speed. One end of the space in the outer duct housing 1 where the variable frequency motor 2 is installed is sealed with an air inlet sealing plate 12, and the other end of the space in the outer duct housing 1 where the impeller 3 is installed is sealed with an air outlet sealing plate 13.

[0032] Please see Figures 2-6The impeller 3 includes a disc 31, blades 32, and a cover 33. The center of the disc 31 is fixedly mounted on the drive shaft of the variable frequency motor 2. Several blades 32 are arranged in a circular array on the side of the disc 31 near the variable frequency motor 2. The other end of the blades 32 is fixedly connected to the cover 33, and the cover 33 is coaxially mounted with the disc 31. A moving groove 34 is provided on the disc 31 and the cover 33 close to the end face of the blades 32. A centrifugal cleaning rod 35 for cleaning the blades 32 is movably inserted into one end of the moving groove 34 near the center line of the disc 31. The centrifugal cleaning rod 35 is close to the end face of the blades 32. The outer end faces of the disc 31 and the cover 33 are slidably mounted with... An elastic sealing cloth 38 is used to seal the moving trough 34 and pull the centrifugal cleaning rod 35 back to its original position. When using a duct-type centrifugal fan to transport unfiltered and unpurified outside air, the variable frequency motor 2 drives the impeller 3 to rotate. During the high-speed rotation of the impeller 3, the centrifugal cleaning rod 35 on the impeller 3 is subjected to centrifugal force. The centrifugal cleaning rod 35 moves along the end face of the blade 32 to the outer edge of the impeller 31. During the movement of the centrifugal cleaning rod 35, the centrifugal cleaning rod 35 scrapes and cleans the end face of the blade 32 to prevent uneven weight of dust on the blade 32, which would cause the impeller 3 to vibrate, thereby reducing noise pollution.

[0033] Please see Figures 2-9 Several power teeth 341 are fixedly installed on the side walls of the two moving slots 34. Transmission gears 355 are fixedly sleeved at both ends of the centrifugal cleaning rod 35, and the transmission gears 355 mesh with the power teeth 341. When the centrifugal cleaning rod 35 moves outward under centrifugal force, the transmission gears 355 and power teeth 341 at the ends of the centrifugal cleaning rod 35 mesh with each other, causing the centrifugal cleaning rod 35 to rotate. The rotating centrifugal cleaning rod 35 cleans the end face of the blade 32, thereby strengthening the cleaning of both sides of the blade 32 by the centrifugal cleaning rod 35.

[0034] Please see Figures 2-9The centrifugal cleaning rod 35 includes a cleaning outer rod 351, a moving rod 352, and a tension spring 353. The cleaning outer rod 351 is a hollow tubular structure, and its outer end face is in close contact with the blade 32. The moving rods 352 are slidably installed at both ends inside the cleaning outer rod 351. The tension spring 353 is fixedly connected to the opposing surfaces of the two moving rods 352. A transmission gear 355 is fixedly sleeved on the end of the moving rod 352 that extends out of the cleaning outer rod 351. The transmission gear 355 meshes with the power gear 341. A cleaning disc 36 is fixedly connected to the end of the moving rod 352. The end of the cleaning disc 36 away from the moving rod 352 is fixedly... A brush 361 is fixedly connected and closely adheres to the inner wall of the outer pipe housing 1. When the variable frequency motor 2 is started, the speed of the variable frequency motor 2 starts slowly and gradually accelerates to the maximum speed. During the process of the centrifugal cleaning rod 35 moving outward and revolving under the centrifugal force, the centrifugal cleaning rod 35 drives the cleaning disc 36 and the brush 361 to rotate. At the same time, the impeller 3 drives the cleaning disc 36 and the brush 361 to revolve. Under the action of the rotation and revolution of the cleaning disc 36 and the brush 361, the brush 361 cleans the inner wall of the outer pipe housing 1, preventing impurities from remaining on the inner wall of the outer pipe housing 1 for a long time, which would cause the inner wall of the outer pipe housing 1 to be corroded.

[0035] Please see Figure 5 and Figure 6 The moving groove 34 has an inclined groove 342 at the end near the edge of the wheel 31 and the wheel cover 33. The tension spring 353 is always in a stretched state. The two ends of the tension spring 353 are fixedly connected to the moving rods 352 on both sides. Under the action of centrifugal force, when the centrifugal cleaning rod 35 and the cleaning disc 36 slide to the end of the moving groove 34, the tension spring 353 pulls the moving rod 352, the cleaning disc 36 and the bristles 361 to move under the action of the elastic force of the tension spring 353. This causes the cleaning disc 36 and the bristles 361 to slide into the inclined groove 342, so that the end of the bristles 361 no longer contacts the inner wall of the outer pipe box 1, preventing the bristles 361 from contacting the inner wall of the outer pipe box 1 for a long time, which would cause the bristles 361 to wear out severely.

[0036] Please see Figures 4-6 A storage groove 321 is provided on the end face of the blade 32 near the edge, and the end of the moving groove 34 near the storage groove 321 is arc-shaped. Under the action of centrifugal force, when the centrifugal cleaning rod 35 and the cleaning disc 36 slide to the position of the end of the moving groove 34, the centrifugal cleaning rod 35 slides into the storage groove 321 of the blade 32, thereby storing the centrifugal cleaning rod 35 and preventing the centrifugal cleaning rod 35 from blocking the flow of gas.

[0037] Please see Figures 2-9The cleaning disc 36 has several insertion holes 362. A scraper disc 37 is fitted around the outside of the cleaning disc 36. The bristles 361 of the cleaning disc 36 pass through the scraper disc 37. Several insertion posts 371 are fixedly connected to the side of the scraper disc 37 near the cleaning disc 36. The insertion posts 371 are movably inserted into the insertion holes 362. The scraper disc 37 is movably disposed within the closed elastic cloth 38. Under the action of centrifugal force, when the centrifugal cleaning rod 35 and the cleaning disc 36 slide to the end of the moving groove 34, the tension spring 353... Under the action of elasticity, the tension spring 353 pulls the moving rod 352, the cleaning disc 36 and the bristles 361 to move, thereby causing the cleaning disc 36 and the bristles 361 to slide into the inclined groove 342. Since the scraper disc 37 is restricted by the wheel disc 31 and the wheel cover 33, the bristles 361 on the cleaning disc 36 are scraped off by the scraper disc 37, thereby removing the impurities on the bristles 361 and preventing the residual impurities on the bristles 361 from affecting the next cleaning of the inner wall of the external pipe box 1.

[0038] The closed elastic cloth 38 located between the scraper 37 and the drive shaft of the variable frequency motor 2 is elastic. The elasticity of the closed elastic cloth 38 is used to pull the scraper 37, the cleaning disc 36 and the centrifugal cleaning rod 35 back to their original positions. When the operation stops, under the action of the elasticity of the closed elastic cloth 38, the closed elastic cloth 38 pulls the cleaning disc 36, the scraper 37 and the centrifugal cleaning rod 35 back to their original positions.

[0039] The working principle of this invention is as follows:

[0040] Please see Figures 1-9 When using a duct-type centrifugal fan to transport unfiltered and unpurified outside air, the variable frequency motor 2 drives the impeller 3 to rotate. During the high-speed rotation of the impeller 3, the centrifugal cleaning rod 35 on the impeller 3 is subjected to centrifugal force. The centrifugal cleaning rod 35 moves along the end face of the blade 32 to the outer edge of the impeller 31. During the movement of the centrifugal cleaning rod 35, the centrifugal cleaning rod 35 scrapes and cleans the end face of the blade 32 to prevent uneven weight of dust on the blade 32, which would cause the impeller 3 to vibrate, thereby reducing noise pollution.

[0041] When the centrifugal cleaning rod 35 moves outward under centrifugal force, the transmission gear 355 at the end of the centrifugal cleaning rod 35 meshes with the power gear 341, and the transmission gear 355 and the power gear 341 mesh and drive, causing the centrifugal cleaning rod 35 to rotate. The rotating centrifugal cleaning rod 35 cleans the end face of the blade 32, thereby strengthening the cleaning of both sides of the blade 32 by the centrifugal cleaning rod 35.

[0042] When the variable frequency motor 2 is started, the speed of the variable frequency motor 2 starts slowly and gradually accelerates to the maximum speed. During the process of the centrifugal cleaning rod 35 moving outward and revolving under the centrifugal force, the centrifugal cleaning rod 35 drives the cleaning disc 36 and the brush bristles 361 to rotate. At the same time, the impeller 3 drives the cleaning disc 36 and the brush bristles 361 to revolve. Under the action of the rotation and revolution of the cleaning disc 36 and the brush bristles 361, the brush bristles 361 clean the inner wall of the outer pipe box 1 to prevent impurities from remaining on the inner wall of the outer pipe box 1 for a long time, which would cause the inner wall of the outer pipe box 1 to be corroded.

[0043] Under the action of centrifugal force, when the centrifugal cleaning rod 35 and the cleaning disc 36 slide to the end of the moving groove 34, under the action of the tension spring 353, the tension spring 353 pulls the moving rod 352, the cleaning disc 36 and the brush 361 to move, so that the cleaning disc 36 and the brush 361 slide into the inclined groove 342, so that the end of the brush 361 no longer contacts the inner wall of the outer pipe box 1, preventing the brush 361 from contacting the inner wall of the outer pipe box 1 for a long time, which would cause the brush 361 to wear out severely.

[0044] As the cleaning disc 36 and brush bristles 361 slide into the inclined groove 342, the brush bristles 361 on the cleaning disc 36 are scraped off by the scraper disc 37 because the scraper disc 37 is restricted by the wheel disc 31 and the wheel cover 33. This removes impurities from the brush bristles 361, preventing residual impurities from affecting the next cleaning of the inner wall of the external pipe box 1.

Claims

1. A centrifugal fan for dust removal, comprising an outer duct housing (1), a variable frequency motor (2), and an impeller (3), wherein the outer duct housing (1) comprises a partition plate (11), an inlet sealing plate (12), and an outlet sealing plate (13), characterized in that: The impeller (3) includes: The wheel (31) is fixedly mounted on the drive shaft of the variable frequency motor (2) at its center position; Several blades (32) are arrayed and connected to the side of the wheel (31) near the variable frequency motor (2); Wheel cover (33) is fixedly connected to the other end of blade (32); The moving groove (34) is formed on the wheel disk (31) and wheel cover (33) that are close to the end face of the blade (32); The centrifugal cleaning rod (35) is inserted into the moving groove (34) at both ends near the center line of the wheel (31) to clean the blades (32); The closed elastic cloth (38) is slidably installed on the outer end face of the wheel disc (31) and the wheel cover (33) to close the moving groove (34) and pull the centrifugal cleaning rod (35) to reset; Several power teeth (341) are fixedly installed on the side walls of the two moving slots (34) close to each other. Transmission gears (355) are fixedly sleeved at both ends of the centrifugal cleaning rod (35), and the transmission gears (355) mesh with the power teeth (341). The centrifugal cleaning rod (35) includes: The outer rod (351) is a hollow tubular structure with its outer end face tightly attached to the blade (32). The movable rod (352) is slidably installed at both ends inside the cleaning outer rod (351); A tension spring (353) is fixedly connected to the opposite surfaces of two moving rods (352); The transmission gear (355) is fixedly sleeved on the end of the moving rod (352) that extends out of the cleaning outer rod (351); The end of the moving rod (352) is fixedly connected to a cleaning disc (36), and the end of the cleaning disc (36) away from the moving rod (352) is fixedly connected to a brush (361), and the brush (361) is in close contact with the inner wall of the outer pipe box (1).

2. A centrifugal fan for dust removal according to claim 1, characterized in that: The moving groove (34) has an inclined groove (342) at the end near the edge of the wheel (31) and the wheel cover (33).

3. A centrifugal fan for dust removal according to claim 1, characterized in that: The tension spring (353) is always in a stretched state, and the two ends of the tension spring (353) are respectively fixedly connected to the moving rods (352) on both sides.

4. A centrifugal fan for dust removal according to claim 1, characterized in that: The blade (32) has a storage groove (321) on its end face near the edge, and the end of the moving groove (34) near the storage groove (321) is arc-shaped.

5. A centrifugal fan for dust removal according to claim 1, characterized in that: The cleaning disc (36) has several insertion holes (362), and a scraper (37) is sleeved on the outside of the cleaning disc (36). The bristles (361) of the cleaning disc (36) penetrate the scraper (37). Several insertion posts (371) are fixedly connected to the side of the scraper (37) near the cleaning disc (36). The insertion posts (371) are movably inserted into the insertion holes (362), and the scraper (37) is movably disposed in the closed elastic cloth (38).

6. A centrifugal fan for dust removal according to claim 5, characterized in that: The closed elastic cloth (38) located between the scraper (37) and the drive shaft of the variable frequency motor (2) is elastic, and the elasticity of the closed elastic cloth (38) is used to pull the scraper (37), the cleaning disc (36) and the centrifugal cleaning rod (35) back to their original positions.

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