Adjustable centrifugal fan

Abstract

The invention relates to the technical field of centrifugal fans, and discloses an adjustable centrifugal fan which is used for solving the problem that external wind power affects indoor air conveying of a pipeline type centrifugal fan. The thrust of the power ring to the outer wheel discs is changed through the thrust of external wind power to the wind shields, the distance between the two outer wheel discs is reduced, the extrusion force of the outer wheel discs enables the connecting shafts on the outer sides of the blades to move in the chutes, and therefore the inclination angles of the blades are increased, the wind pressure of gas conveyed by the impeller is increased, and the reverse wind pressure of the external wind power is balanced; gas backflow caused by reverse wind pressure of external wind power is prevented; the inclination angle of the blade is changed by changing external wind power, so that the blade drives the connecting shaft on the inner side of the blade to rotate, the rotating connecting shaft drives the winding wheel to rotate synchronously, the winding wheel winds the steel wire rope, and the steel wire rope pulls the scraping rod to clean the surface of the blade. And the situation that dust of different masses is left on the multiple blades, and consequently vibration occurs when the impeller rotates is prevented.

Description

Technical Field

[0001] The present application relates to the technical field of centrifugal fans, and in particular to an adjustable centrifugal fan. Background Art

[0002] Centrifugal fans are mechanical equipment that use centrifugal force to convert mechanical energy into gas kinetic energy and pressure energy. They are widely used in industries, construction, agriculture, etc. Their core working principle is to use high-speed rotating impellers to do work on the gas, so that the gas gains energy, thereby achieving the purpose of transportation and ventilation. Centrifugal fans can be divided into horizontal centrifugal fans, vertical centrifugal fans and ducted centrifugal fans according to the installation form. Among them, ducted centrifugal fans are generally embedded in air ducts and used in central air conditioning ventilation systems.

[0003] When using a ducted centrifugal fan to blow indoor air to the outdoors, when the outlet of the air duct is in a windward position, the outside air will have a great impact on the exhaust. When the external wind is too strong, the external wind will blow into the air duct, and the indoor gas will not only be unable to be discharged, but will also flow back. Moreover, when the external wind is unstable, the fluctuating wind force can easily affect the ducted centrifugal fan's delivery of indoor gas. Summary of the invention

[0004] The present application proposes an adjustable centrifugal fan, which has the advantage of automatically adjusting the wind pressure according to the external wind force, and is used to solve the problem that the external wind force affects the indoor gas delivery of the ducted centrifugal fan.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: an adjustable centrifugal fan, comprising an outer pipe box, a power motor, an impeller and a control device, the outer pipe box comprising a partition plate, an inlet and outlet sealing plate, and the impeller comprising: two inner wheel discs, arranged in parallel, the inner wheel disc away from the power motor is fixedly sleeved on the output shaft of the power motor, the inner wheel disc close to the power motor is movably sleeved on the output shaft of the power motor, and a ventilation port is provided in the middle of the inner wheel disc close to the power motor; an outer wheel disc, movably clamped on the outer ring of the inner wheel disc, and a plurality of inclined grooves are provided on the opposite surfaces of the outer wheel disc; a plurality of connecting shafts, the connecting shaft between the two inner wheel discs is movably inserted into the inner wheel disc, and the connecting shaft between the two outer wheel discs is movably inserted into the inclined groove; a plurality of blades, the two ends of which are movably sleeved on the connecting shaft between the inner wheel discs and the connecting shaft between the outer wheel discs respectively; an external power mechanism, movably arranged on the outer pipe box and the partition plate on the side wall of the impeller, for external wind to drive the outer wheel disc to move.

[0006] Furthermore, the inclined groove on the outer wheel disc is an arc-shaped groove, which is shallow at one end and deep at the other end. In the initial state, the end of the connecting shaft at the outer end of the impeller is at the shallower end of the inclined groove.

[0007] Furthermore, the external power mechanism includes: a power ring, the outer wall of which is provided with a plurality of external threads, which are threadedly connected to the outer pipe box and the partition plate on the side wall of the impeller; a connecting column, which is fixedly connected to the top of the side of the power ring away from the impeller; a wind shield, which is fixedly connected to the top of the connecting column; and a plurality of return springs, one end of which is fixedly connected to the two sides of the wind shield, and the other end of which is fixedly connected to the outer pipe box.

[0008] Furthermore, a plurality of balls are embedded in an array at one end of the power ring close to the impeller, and the balls are in rolling contact with the outer wheel disc.

[0009] Furthermore, the blade is provided with a cleaning mechanism for cleaning the blade, and the cleaning mechanism includes: a scraper rod, slidably mounted on the end surface of the blade; a power component, including a winding wheel and a wire rope, the winding wheel is movably sleeved on both ends of the connecting shaft on the inner wheel disk, a wire rope is wound around the winding wheel, and the other end of the wire rope is fixedly connected to the scraper rod; the end of the connecting shaft inserted into the inner wheel disk is provided with an anti-reversal component for preventing the connecting shaft from reversing.

[0010] Furthermore, the anti-reversal component includes: a ratchet, which is fixedly sleeved and used to connect the end of the shaft; a plurality of ratchet teeth, which are arranged on the outside of the ratchet and one end is hinged to the inner wheel disc; and an elastic component, which is fixedly connected to the inner wheel disc and is used to push the ratchet teeth to be clamped on the ratchet.

[0011] Furthermore, a clockwork spring is sleeved on the end of the connecting shaft inserted in the inclined groove, one end of the clockwork spring is fixedly connected to the connecting shaft, the other end of the clockwork spring is fixedly connected to a connecting belt, the connecting belt is wound around the outside of the clockwork spring, and the other end of the connecting belt is fixedly connected to the scraper rod.

[0012] Furthermore, an outer movable sleeve of the ratchet is provided with an electromagnetic ring, the electromagnetic ring is fixedly connected to the inner wheel disc, the electromagnetic ring is electrically connected to the control device through a slip ring on the output shaft of the power motor, and the ratchet is a permanent magnet block.

[0013] Furthermore, a shaking disk is fixedly sleeved on the connecting shaft between the two winding wheels, and a plurality of shaking blocks are installed in an annular array on the outer side of the shaking disk.

[0014] This application has the following beneficial effects: 1. The application provides an adjustable centrifugal fan, which changes the thrust of the power ring on the outer wheel disc through the thrust of the external wind on the wind shield, so that the distance between the two outer wheel discs is reduced, and the connecting shaft on the outer side of the blade moves in the inclined groove through the squeezing of the two outer wheel discs, thereby increasing the inclination angle of the blade, increasing the wind pressure of the gas transported by the impeller, thereby balancing the reverse wind pressure of the external wind force and preventing the reverse wind pressure of the external wind force from causing gas reflux.

[0015] 2. The application provides an adjustable centrifugal fan, which changes the inclination angle of the blades by changing the external wind force, so that the blades drive the connecting shaft inside the blades to rotate, and the rotating connecting shaft drives the winding wheel to rotate synchronously, so that the winding wheel reels the wire rope, and the wire rope pulls the scraper rod to clean the surface of the blade, thereby preventing dust of different qualities from remaining on several blades, causing vibration when the impeller rotates.

[0016] 3. The present application provides an adjustable centrifugal fan. When the scraper rod moves to the innermost side of the blade, the inner connecting shaft drives the shaking disk and the shaking block to continue to rotate. The continuously rotating shaking block cyclically lifts the scraper rod, thereby causing the scraper rod to shake, thereby assisting in cleaning the dust remaining on the scraper rod and preventing the dust remaining on the scraper rod from affecting the next cleaning of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute a part of the specification, illustrate embodiments disclosed in the present application and, together with the description, serve to explain the principles disclosed in the present application.

[0018] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which: Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 It is a structural schematic diagram of the external power mechanism and the impeller of the present invention; Figure 4 It is a structural schematic diagram of the external power mechanism of the present invention; Figure 5 It is a structural schematic diagram of the impeller of the present invention; Figure 6 It is a schematic diagram of the structure of the impeller part of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the local structure at A in the middle; Figure 8 It is a schematic diagram of the structure of the outer wheel disc, the inner wheel disc and the blades of the present invention; Fig. 9 For the present invention Figure 8 Schematic diagram of the local structure at point B in the middle.

[0019] In the figure: 1. outer pipe box; 11. partition plate; 12. inlet and outlet plate; 13. outlet and outlet plate; 14. movable hole; 2. power motor; 3. impeller; 31. outer wheel disc; 311. inclined groove; 32. inner wheel disc; 33. connecting shaft; 34. blade; 35. outer power mechanism; 351. power ring; 352. connecting column; 353. wind shield; 354. ball; 36. cleaning mechanism; 361. scraper rod; 362. winding wheel; 363. wire rope; 364. ratchet; 365. ratchet; 371. spring; 372. connecting belt; 38. shaking disk; 381. shaking block. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] See also Figure 1 and Figure 2 An adjustable centrifugal fan comprises an outer pipe box body 1, a power motor 2, an impeller 3 and a control device (the control device is an existing mechanism and is not shown in the figure). A partition plate 11 is fixedly installed in the middle position inside the outer pipe box body 1 to divide the outer pipe box body 1 into two spaces. A power motor 2 is fixedly installed on the inner wall of the space on one side of the partition plate 11. The output shaft of the power motor 2 passes through the partition plate 11 and extends into the space on the other side. An impeller 3 is arranged in the space on the other side of the partition plate 11. The impeller 3 is fixedly sleeved on the output shaft of the power motor 2. A closed inlet sealing plate 12 is fixedly installed at one end of the space where the power motor 2 is installed, and a closed outlet sealing plate 13 is fixedly installed at the other end of the other space.

[0022] See also Figure 2-Figure 9The impeller 3 includes an outer wheel disc 31, an inner wheel disc 32, a connecting shaft 33 and blades 34. Two parallel inner wheel discs 32 are sleeved on the output shaft of the power motor 2. The inner wheel disc 32 far away from the power motor 2 is fixedly sleeved on the output shaft of the power motor 2, and the inner wheel disc 32 close to the power motor 2 is movably sleeved on the output shaft of the power motor 2. A vent is provided in the middle of the inner wheel disc 32 close to the power motor 2. The outer ring of the inner wheel disc 32 is movably clamped with the outer wheel disc 31. The outer wheel disc 31 can move in the axial direction of the inner wheel disc 32. A plurality of connecting shafts 33 are provided between the two parallel inner wheel discs 32. The two ends of the connecting shaft 33 are respectively movably inserted into the inner wheels 32 on both sides, and a plurality of inclined grooves 311 are provided on the opposite surfaces of the two outer wheels 31, and the connecting shaft 33 is inserted into the opposite inclined grooves 311 on the two outer wheels 31. A plurality of blades 34 are provided between the outer wheels 31 and the inner wheels 32, and one end of the blade 34 is movably sleeved on the connecting shaft 33 between the inner wheels 32, and the other end of the blade 34 is movably sleeved on the connecting shaft 33 between the outer wheels 31. An external power mechanism 35 for driving the outer wheels 31 to move by external wind is movably provided on the outer pipe box 1 and the partition plate 11 on the side wall of the impeller 3; The inclined groove 311 on the outer wheel disc 31 is an arc-shaped groove, and the inclined groove 311 is a groove with one end shallow and the other end deep. In the initial state, the end of the connecting shaft 33 at the outer end of the impeller 3 is at the shallower end of the inclined groove 311. During the rotation process, the resistance of the airflow will also push the connecting shaft 33 at the outer end of the blade 34 to slide to the shallower end of the inclined groove 311. The external power mechanism 35 includes a power ring 351, a connecting column 352 and a wind shield 353. The outer wall annular array of the power ring 351 is installed with a plurality of external threads. The power ring 351 is threadedly connected to the outer pipe box 1 and the partition plate 11 on the side wall of the impeller 3. The top of the power ring 351 away from the impeller 3 is fixedly connected with the connecting column 352. A movable hole 14 is opened in the middle position of the top of the outer pipe box 1, and one of the connecting columns 352 passes through the movable hole 14 and extends out. The top of the connecting column 352 is fixedly connected with the wind shield 353, and the wind shield 353 is parallel to the inlet closing plate 12. Reset springs are fixedly connected to both sides of the wind shield 353, and the other end of the reset spring is fixedly connected to the outer pipe box 1.

[0023] When using a ducted centrifugal fan to exhaust indoor gas, the ducted centrifugal fan is installed at the external outlet of the air duct. When the external wind force is opposite to the wind blown out of the air duct, the external wind force blows toward the wind shield 353 at the same time. The external wind force will push the wind shield 353 to drive the connecting column 352 and the power ring 351 to rotate around the axis of the power ring 351. Since the power ring 351 is threadedly connected to the outer pipe box 1 and the partition plate 11, the rotating power ring 351 will move toward the outer wheel disc 31, and the power ring 351 squeezes the outer wheel disc 31. The outer wheels 31 on both sides squeeze the outer wheel disc The end of the connecting shaft 33 on the outer wheel disc 31 slides from a shallow position of the inclined groove 311 to a deeper position, so that the connecting shaft 33 on the outer wheel disc 31 drives the blades 34 to rotate around the connecting shaft 33 on the inner wheel disc 32, thereby changing the inclination angle of the blades 34, and increasing the inclination angle of the blades 34. At the same speed, the wind pressure of the air volume pushed by the blades 34 increases, and the increased wind pressure is used to balance the external wind force, so that the indoor gas can be discharged stably, thereby ensuring the stability of the centrifugal fan operation and preventing the reverse wind pressure of the external wind force from causing gas reflux.

[0024] A plurality of balls 354 are embedded in an array at one end of the power ring 351 close to the impeller 3, and the balls 354 are in rolling contact with the outer wheel disc 31; when the wind shield 353 drives the connecting column 352 and the power ring 351 to rotate, the balls 354 on the power ring 351 are used to reduce the friction between the power ring 351 and the outer wheel disc 31.

[0025] The blade 34 is provided with a cleaning mechanism 36 for cleaning the blade 34. The cleaning mechanism 36 includes a scraper rod 361, a power component and an anti-reversal component. The scraper rod 361 is slidably mounted on the end surface of the blade 34, and the end of the scraper rod 361 is clamped on the blade 34 to prevent the scraper rod 361 from falling off the blade 34. The power component is used to drive the scraper rod 361 to move, and is arranged on the connecting shaft 33 inserted into the inner wheel disc 32. The power component includes a winding wheel 362 and a wire rope 363. The winding wheel 362 is movably sleeved on both ends of the connecting shaft 33 on the inner wheel disc 32. The wire rope 363 is wound around the winding wheel 362, and the other end of the wire rope 363 is fixedly connected to the scraper rod 361. The end of the connecting shaft 33 inserted into the inner wheel disc 32 is provided with an anti-reversal component for preventing the connecting shaft 33 from reversing. The anti-reversal component includes a ratchet 364 and ratchet teeth 365. The ratchet 364 is fixedly sleeved on the end of the connecting shaft 33, and a plurality of ratchet teeth 365 are provided on the outer side of the ratchet 364. One end of the ratchet teeth 365 is hinged to the inner wheel disc 32. An elastic component for pushing the ratchet teeth 365 to be clamped on the ratchet 364 is fixedly connected to the inner wheel disc 32. A clockwork spring 371 is sleeved on the end of the connecting shaft 33 inserted in the inclined groove 311, one end of the clockwork spring 371 is fixedly connected to the connecting shaft 33, the other end of the clockwork spring 371 is fixedly connected to a connecting belt 372, and the connecting belt 372 is wound around the outside of the clockwork spring 371, and the other end of the connecting belt 372 is fixedly connected to the scraper rod 361.

[0026] When the external wind pressure changes, the thrust of the wind pressure on the wind shield 353 changes accordingly. In this process, the rotation angle of the power ring 351 changes, and the pushing distance of the power ring 351 on the outer wheel disc 31 also changes accordingly, so that the blades 34 rotate back and forth around the connecting shaft 33 on the inner wheel disc 32 for many times. During the rotation of the blades 34, due to the large friction between the blades 34 and the connecting shaft 33 inserted into the inner wheel disc 32, the blades 34 drive the connecting shaft 33 on the inner wheel disc 32 to rotate synchronously, so that the connecting shaft 33 drives the winding wheel 362 to rotate synchronously, and the rotating winding wheel 362 reels the wire rope 363, so that the other end of the wire rope 363 pulls the scraper rod 361 to move, and the moving scraper rod 361 scrapes the surface of the blade 34, thereby preventing dust of different masses from remaining on several blades 34, causing vibration when the impeller 3 rotates.

[0027] There is friction between the connecting shaft 33 inserted into the inner wheel disc 32 and the blades 34 and the winding wheel 362. When the connecting shaft 33 inserted into the inner wheel disc 32 and the winding wheel 362 are not subjected to external force, the blades 34 can drive the connecting shaft 33 and the winding wheel 362 on the inner wheel disc 32 to rotate synchronously.

[0028] The outer movable sleeve of the ratchet 365 is provided with an electromagnetic ring, and the electromagnetic ring is fixedly connected to the inner wheel disc 32. The electromagnetic ring is electrically connected to the control device through the slip ring on the output shaft of the power motor 2. The ratchet 365 is a permanent magnet block. At each start-up, the control device energizes the electromagnetic ring on the outer side of the ratchet 365, and the electromagnetic ring generates a magnetic force to attract the ratchet 365, so that the ratchet 365 releases the limit on the ratchet wheel 364. Under the action of the clockwork spring 371, the clockwork spring 371 pulls the connecting belt 372 and the scraper rod 361 to reset.

[0029] A shaking disk 38 is fixedly sleeved on the connecting shaft 33 between the two winding wheels 362, and a plurality of shaking blocks 381 are installed on the outer ring array of the shaking disk 38; when the scraper rod 361 is pulled onto the shaking disk 38 by the rotating winding wheel 362, the scraper rod 361 can no longer be pulled. At this time, when the blade 34 rotates, the blade 34 will drive the shaking disk 38 and the shaking block 381 to rotate, and the rotating shaking disk 38 and the shaking block 381 cyclically lift the scraper rod 361, so that the scraper rod 361 shakes, and the dust remaining on the scraper rod 361 is auxiliary cleaned to prevent the dust remaining on the scraper rod 361 from affecting the next cleaning of the blade 34.

[0030] The working principle of the present invention is as follows: See also Figure 1-Figure 9 When the duct type centrifugal fan is used to exhaust the indoor gas, the duct type centrifugal fan is installed at the external outlet of the air duct. When the external wind force is opposite to the wind blown out of the air duct, the external wind force blows toward the wind shield 353 at the same time. The external wind force will push the wind shield 353 to drive the connecting column 352 and the power ring 351 to rotate around the axis of the power ring 351. Since the power ring 351 is threadedly connected with the outer pipe box 1 and the partition plate 11, the rotating power ring 351 will move toward the outer wheel disc 31, and the power ring 351 squeezes the outer wheel disc 31. The outer wheels 31 on both sides squeeze the outer wheel disc The end of the connecting shaft 33 on the outer wheel disc 31 slides from a shallow position of the inclined groove 311 to a deeper position, so that the connecting shaft 33 on the outer wheel disc 31 drives the blades 34 to rotate around the connecting shaft 33 on the inner wheel disc 32, thereby changing the inclination angle of the blades 34, and increasing the inclination angle of the blades 34. At the same speed, the wind pressure of the air volume pushed by the blades 34 increases, and the increased wind pressure is used to balance the external wind force, so that the indoor gas can be discharged stably, thereby ensuring the stability of the centrifugal fan operation and preventing the reverse wind pressure of the external wind force from causing gas reflux.

[0031] When the external wind pressure changes, the thrust of the wind pressure on the wind shield 353 changes accordingly. In this process, the rotation angle of the power ring 351 changes, and the pushing distance of the power ring 351 on the outer wheel disc 31 also changes accordingly, so that the blades 34 rotate back and forth around the connecting shaft 33 on the inner wheel disc 32 for many times. During the rotation of the blades 34, due to the large friction between the blades 34 and the connecting shaft 33 inserted into the inner wheel disc 32, the blades 34 drive the connecting shaft 33 on the inner wheel disc 32 to rotate synchronously, so that the connecting shaft 33 drives the winding wheel 362 to rotate synchronously, and the rotating winding wheel 362 reels the wire rope 363, so that the other end of the wire rope 363 pulls the scraper rod 361 to move, and the moving scraper rod 361 scrapes the surface of the blade 34, thereby preventing dust of different masses from remaining on several blades 34, causing vibration when the impeller 3 rotates.

[0032] When the scraper rod 361 is pulled onto the shaking disk 38 by the rotating winding wheel 362, the scraper rod 361 can no longer be pulled. At this time, when the blade 34 rotates, the blade 34 will drive the shaking disk 38 and the shaking block 381 to rotate. The rotating shaking disk 38 and the shaking block 381 cyclically lift the scraper rod 361, thereby causing the scraper rod 361 to shake, and assisting in cleaning the dust remaining on the scraper rod 361 to prevent the dust remaining on the scraper rod 361 from affecting the next cleaning of the blade 34.

Claims

1. An adjustable centrifugal fan, comprising an outer pipe box (1), a power motor (2), an impeller (3) and a control device, wherein the outer pipe box (1) comprises a partition plate (11), an inlet sealing plate (12) and an outlet sealing plate (13), characterized in that: The impeller (3) comprises: Two inner wheel discs (32) are arranged in parallel, the inner wheel disc (32) away from the power motor (2) is fixedly sleeved on the output shaft of the power motor (2), and the inner wheel disc (32) close to the power motor (2) is movably sleeved on the output shaft of the power motor (2), and a ventilation hole is opened in the middle of the inner wheel disc (32) close to the power motor (2); An outer wheel disc (31) is movably mounted on the outer ring of the inner wheel disc (32), and a plurality of inclined grooves (311) are formed on the opposite surface of the outer wheel disc (31); A plurality of connecting shafts (33), wherein the connecting shaft (33) between the two inner wheel discs (32) is movably inserted into the inner wheel disc (32), and the connecting shaft (33) between the two outer wheel discs (31) is movably inserted into the inclined groove (311); A plurality of blades (34), both ends of which are movably sleeved on the connecting shaft (33) between the inner wheel discs (32) and the connecting shaft (33) between the outer wheel discs (31); The external power mechanism (35) is movably disposed on the outer pipe box (1) and the partition plate (11) on the side wall of the impeller (3) and is used to drive the outer wheel disc (31) to move by external wind force.

2. The adjustable centrifugal fan according to claim 1, characterized in that: The inclined groove (311) on the outer wheel disc (31) is an arc-shaped groove, and the inclined groove (311) is a groove with one end being shallow and the other end being deep. In an initial state, the end of the connecting shaft (33) at the outer end of the impeller (3) is located at the shallower end of the inclined groove (311).

3. The adjustable centrifugal fan according to claim 2, characterized in that: The external power mechanism (35) comprises: The power ring (351) has a plurality of external threads installed on its outer wall, and is threadably connected to the outer pipe box (1) and the partition plate (11) on the side wall of the impeller (3); A connecting column (352) fixedly connected to a top end of a side of the power ring (351) away from the impeller (3); A windshield plate (353) fixedly connected to the top end of the connecting column (352); A plurality of return springs, one end of which is fixedly connected to both sides of the wind shield (353), and the other end of which is fixedly connected to the outer pipe box (1).

4. The adjustable centrifugal fan according to claim 3, characterized in that: A plurality of balls (354) are embedded in an array at one end of the power ring (351) close to the impeller (3), and the balls (354) are in rolling contact with the outer wheel disc (31).

5. The adjustable centrifugal fan according to claim 3, characterized in that: The blade (34) is provided with a cleaning mechanism (36) for cleaning the blade (34), and the cleaning mechanism (36) comprises: A scraper rod (361) is slidably mounted on an end surface of the blade (34); The power component comprises a winding wheel (362) and a steel wire rope (363), wherein the winding wheel (362) is movably sleeved on both ends of the connecting shaft (33) on the inner wheel disc (32), the steel wire rope (363) is wound around the winding wheel (362), and the other end of the steel wire rope (363) is fixedly connected to the scraper rod (361); An anti-reversal component for preventing the connecting shaft (33) from reversing is provided at the end of the connecting shaft (33) inserted into the inner wheel disc (32).

6. The adjustable centrifugal fan according to claim 5, characterized in that: The anti-reversal component comprises: A ratchet (364) fixedly sleeved and used to connect the end of the shaft (33); A plurality of ratchet teeth (365) are arranged on the outside of the ratchet wheel (364), and one end of the ratchet teeth is hinged to the inner wheel disc (32); The elastic component is fixedly connected to the inner wheel disc (32) and is used to push the ratchet teeth (365) to be clamped on the ratchet wheel (364).

7. The adjustable centrifugal fan according to claim 6, characterized in that: A spring (371) is sleeved on the end of the connecting shaft (33) inserted into the inclined groove (311); one end of the spring (371) is fixedly connected to the connecting shaft (33); the other end of the spring (371) is fixedly connected to a connecting belt (372); the connecting belt (372) is wound around the outside of the spring (371); and the other end of the connecting belt (372) is fixedly connected to the scraper rod (361).

8. The adjustable centrifugal fan according to claim 7, characterized in that: An outer movable sleeve of the ratchet (365) is provided with an electromagnetic ring, the electromagnetic ring is fixedly connected to the inner wheel disc (32), the electromagnetic ring is electrically connected to the control device via a slip ring on the output shaft of the power motor (2), and the ratchet (365) is a permanent magnet block.

9. The adjustable centrifugal fan according to claim 7, characterized in that: A shaking disc (38) is fixedly sleeved on the connecting shaft (33) between the two winding wheels (362), and a plurality of shaking blocks (381) are installed in an annular array outside the shaking disc (38).

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