Adjustable centrifugal fan

Abstract

The application relates to the technical field of centrifugal fans, and discloses an adjustable centrifugal fan, which is used to solve the problem of the influence of external wind on the indoor gas conveying of a pipeline type centrifugal fan. The thrust of external wind on the wind shield changes the thrust of the power ring on the outer wheel disc, the distance between the two outer wheel discs is reduced, the extrusion force of the outer wheel disc moves the connecting shaft outside the blade in the inclined groove, the inclination angle of the blade is increased, the air pressure of the gas conveying impeller is increased, the reverse air pressure of the external wind is balanced, and the reverse air pressure of the external wind is prevented from causing gas backflow; the inclination angle of the blade is changed through the change of the external wind, the blade drives the connecting shaft inside the blade to rotate, the rotating connecting shaft drives the winding wheel to synchronously rotate, the winding wheel winds the steel wire rope, the steel wire rope drives the scraper rod to clean the surface of the blade, and the dust of different qualities remaining on the blades is prevented from causing vibration when the impeller rotates.

Description

TECHNICAL FIELD

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

[0002] The centrifugal fan is a kind of mechanical equipment for converting mechanical energy into gas kinetic energy and pressure energy by using centrifugal force, and is widely used in industrial, construction, agricultural and other fields. The core working principle is to make the gas obtain energy by doing work on the gas through the high-speed rotating impeller, so as to achieve the purpose of conveying and ventilating. The centrifugal fan can be divided into horizontal centrifugal fan, vertical centrifugal fan and pipeline centrifugal fan according to the installation form. Among them, the pipeline centrifugal fan is generally embedded in the air pipe and used for central air conditioning ventilation system.

[0003] When the pipeline centrifugal fan is used to blow the indoor air to the outdoor, when the outlet of the air duct is in the windward position, the external air will have a great influence on the exhaust air. When the external wind force is too large, the external wind force will blow into the air duct, and the indoor gas not only cannot be discharged, but also will appear the backflow phenomenon. And when the external wind force is unstable, the large and small wind force will easily affect the conveying of the indoor gas by the pipeline centrifugal fan. SUMMARY

[0004] The application provides an adjustable centrifugal fan, which has the advantages of automatically adjusting the wind pressure according to the external wind force, so as to solve the problem that the external wind force affects the conveying of the indoor gas by the pipeline centrifugal fan.

[0005] In order to achieve the above purpose, the application adopts the following technical scheme: an adjustable centrifugal fan, comprising an outer pipeline box, a power motor, an impeller and a control device, the outer pipeline box comprises a partition plate, an inlet closing plate and an outlet closing plate, the impeller comprises: two inner wheel plates, which are arranged in parallel, the inner wheel plate away from the power motor is fixedly sleeved on the output shaft of the power motor, the inner wheel plate close to the power motor is movably sleeved on the output shaft of the power motor, and a ventilation opening is formed in the middle of the inner wheel plate close to the power motor; an outer wheel plate movably clamped on the outer circle of the inner wheel plate, a plurality of inclined grooves are formed on the opposite surfaces of the outer wheel plate; a plurality of connecting shafts, the connecting shafts between the two inner wheel plates are movably inserted into the inner wheel plates, and the connecting shafts between the two outer wheel plates are movably inserted into the inclined grooves; a plurality of blades, the two ends of the blades are movably sleeved on the connecting shafts between the inner wheel plates and the connecting shafts between the outer wheel plates; and an outer power mechanism movably arranged on the outer pipeline box and the partition plate of the side wall of the impeller, used for driving the outer wheel plate to move by the external wind force.

[0006] Further, the inclined grooves on the outer wheel plate are arc grooves, the inclined grooves are grooves with one shallow end and one deep end, and in the initial state, the end part of the connecting shaft at the outer end of the impeller is located at the shallow end of the inclined groove.

[0007] Further, the outer power mechanism comprises: a power ring, an outer wall of which is provided with a plurality of external threads, which are screwed with the outer pipeline box and the partition plate of the impeller side wall; a connecting column, which is fixedly connected to the top end of the side of the power ring away from the impeller; a wind deflector, which is fixedly connected to the top end of the connecting column; a plurality of return springs, one end of which is fixedly connected to the two sides of the wind deflector, and the other end of which is fixedly connected with the outer pipeline box.

[0008] Further, a plurality of balls are arranged and embedded in the end of the power ring close to the impeller, and the balls are in rolling contact with the outer wheel disc.

[0009] Further, a cleaning mechanism for cleaning the blades is arranged on the blades, and the cleaning mechanism comprises: a scraping rod, which is slidingly installed on the end face of the blade; a power member, which comprises a winding wheel and a steel wire rope, the winding wheel is movably sleeved on the connecting shaft on the inner wheel disc, the steel wire rope is wound on the winding wheel, and the other end of the steel wire rope is fixedly connected to the scraping rod; and an anti-reverse member, which is arranged on the end of the connecting shaft inserted into the inner wheel disc, and is used for preventing the reverse rotation of the connecting shaft.

[0010] Further, the anti-reverse member comprises: a ratchet wheel, which is fixedly sleeved on the end of the connecting shaft; a plurality of ratchet teeth, which are arranged on the outer side of the ratchet wheel, and one end of which is hingedly connected to the inner wheel disc; and an elastic member, which is fixedly connected to the inner wheel disc, and is used for pushing the ratchet teeth to be clamped on the ratchet wheel.

[0011] Further, a clock spring is sleeved on the end of the connecting shaft inserted into the inclined groove, one end of the clock spring is fixedly connected to the connecting shaft, the other end of the clock spring is fixedly connected with a connecting belt, the connecting belt is wound on the outer side of the clock spring, and the other end of the connecting belt is fixedly connected with the scraping rod.

[0012] Further, an electromagnetic ring is movably sleeved on the outer side of the ratchet teeth, the electromagnetic ring is fixedly connected to the inner wheel disc, the electromagnetic ring is electrically connected with the control device through the slip ring on the power motor output shaft, and the ratchet teeth are permanent magnets.

[0013] Further, a shaking disc is fixedly sleeved on the connecting shaft between the two winding wheels, and a plurality of shaking blocks are annularly arranged on the outer side of the shaking disc.

[0014] The application has the following beneficial effects:

[0015] 1. The adjustable centrifugal ventilator provided by the application can change the thrust of the power ring on the outer wheel disc through the thrust of the external wind force on the wind deflector, so that the distance between the two outer wheel discs is reduced, the connecting shaft on the outer side of the blade is moved in the inclined groove through the extrusion of the two outer wheel discs, the inclination angle of the blade is increased, the wind pressure of the gas delivered by the impeller is increased, the reverse wind pressure of the external wind force is balanced, and the reverse wind pressure of the external wind force is prevented from causing the gas backflow.

[0016] 2. The adjustable centrifugal ventilator provided by the application changes the inclination angle of the blades by changing the external wind force, so that the blades drive the connecting shafts inside the blades to rotate, the rotating connecting shafts drive the winding wheels to rotate synchronously, so that the winding wheels wind the steel wire rope, and the steel wire rope drives the scraper rod to clean the surface of the blades, preventing the dust of different qualities remaining on the blades from causing vibration when the impeller rotates.

[0017] 3. The adjustable centrifugal ventilator provided by the application, when the scraper rod moves to the innermost side of the blades, the inner connecting shaft drives the shaking disc and the shaking block to continue rotating, and the continuously rotating shaking block cyclically lifts the scraper rod, so that the scraper rod shakes and the dust remaining on the scraper rod is cleaned, preventing the dust remaining on the scraper rod from affecting the cleaning of the blades next time. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which constitute a part of this specification, illustrate embodiments of the present disclosure and serve to explain the principles of the present disclosure.

[0019] The present disclosure can be understood more clearly with reference to the following detailed description in conjunction with the accompanying drawings, in which:

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0021] Figure 2 is a schematic diagram of the internal structure of the present application;

[0022] Figure 3 is a schematic diagram of the structure of the external power mechanism and the impeller of the present application;

[0023] Figure 4 is a schematic diagram of the structure of the external power mechanism of the present application;

[0024] Figure 5 is a schematic diagram of the structure of the impeller of the present application;

[0025] Figure 6 is a schematic diagram of the partial structure of the impeller of the present application;

[0026] Figure 7 is a schematic diagram of the partial structure of the present application at A; Figure 6

[0027] is a schematic diagram of the structure of the external wheel disc, the internal wheel disc and the blades of the present application; Figure 8

[0028] is a schematic diagram of the partial structure of the present application at B. Figure 9 Figure 8

[0029] ​​In the diagram: 1. Outer pipe housing; 11. Divider plate; 12. Inlet sealing plate; 13. Outlet sealing plate; 14. Moving hole; 2. Power motor; 3. Impeller; 31. Outer wheel disc; 311. Inclined groove; 32. Inner wheel disc; 33. Connecting shaft; 34. Blade; 35. External power mechanism; 351. Power ring; 352. Connecting column; 353. Baffle plate; 354. Ball bearing; 36. Cleaning mechanism; 361. Scraper; 362. Winding wheel; 363. Wire rope; 364. Ratchet; 365. Ratchet tooth; 371. Clock spring; 372. Connecting belt; 38. Shaking disc; 381. Shaking block. 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 An adjustable centrifugal fan includes an outer duct housing 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 of the outer duct housing 1, dividing the outer duct housing 1 into two spaces. The power motor 2 is fixedly installed on the inner wall of one side of the space 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 provided 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.

[0032] Please see Figures 2-9, the impeller 3 comprises an outer disc 31, an inner disc 32, a connecting shaft 33 and a blade 34, the output shaft of the motor 2 is sleeved with two parallel inner discs 32, the inner disc 32 away from the motor 2 is fixedly sleeved on the output shaft of the motor 2, the inner disc 32 close to the motor 2 is movably sleeved on the output shaft of the motor 2, and a ventilation opening is formed in the middle of the inner disc 32 close to the motor 2, the outer ring of the inner disc 32 is movably clamped with the outer disc 31, the outer disc 31 can move in the axial direction of the inner disc 32, a plurality of connecting shafts 33 are arranged between the two parallel inner discs 32, the two ends of the connecting shaft 33 are movably inserted into the inner discs 32 on the two sides, a plurality of inclined grooves 311 are formed on the opposite surfaces of the two outer discs 31, the connecting shaft 33 is inserted into the opposite inclined grooves 311 of the two outer discs 31, a plurality of blades 34 are arranged between the outer disc 31 and the inner disc 32, one end of the blade 34 is movably sleeved on the connecting shaft 33 between the inner discs 32, and the other end of the blade 34 is movably sleeved on the connecting shaft 33 between the outer discs 31, the outer pipeline box body 1 and the partition plate 11 of the side wall of the impeller 3 are movably provided with an outer power mechanism 35 for driving the outer disc 31 to move under the action of external wind force;

[0033] The inclined groove 311 on the outer disc 31 is an arc-shaped groove, and the inclined groove 311 is a groove with one shallow end and one deep end, in the initial state, the end portion of the connecting shaft 33 at the outer end of the impeller 3 is located at the shallow end of the inclined groove 311, and in the rotating process, the resistance of the airflow also drives the connecting shaft 33 at the outer end of the blade 34 to slide to the shallow end of the inclined groove 311;

[0034] The outer power mechanism 35 comprises a power ring 351, a connecting column 352 and a wind shield 353, a plurality of external threads are annularly arranged on the outer wall of the power ring 351, the power ring 351 is threadedly connected with the outer pipeline box body 1 and the partition plate 11 of the side wall of the impeller 3, the connecting column 352 is fixedly connected to the top end of the power ring 351 away from the impeller 3, a moving hole 14 is formed in the middle position of the top end of the outer pipeline box body 1, one of the connecting columns 352 penetrates through the moving hole 14 and extends out, the wind shield 353 is fixedly connected to the top end of the connecting column 352, and the wind shield 353 is parallel to the inlet sealing plate 12, the wind shield 353 is fixedly connected with a reset spring on the two sides, and the other end of the reset spring is fixedly connected with the outer pipeline box body 1.

[0035] When the indoor gas is exhausted by using the pipeline centrifugal fan, the pipeline centrifugal fan is installed at the position of the outlet of the air duct. When the external wind force is opposite to the wind blown by the air duct, the external wind force blows to the wind shield 353 at the same time. The external wind force pushes 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 screwed with the outer pipeline box 1 and the partition plate 11, the rotating power ring 351 moves to the outer disc 31. The power ring 351 extrudes the outer disc 31. The outer disc 31 extrudes the connecting shaft 33 between the two outer discs 31. The end of the connecting shaft 33 on the outer disc 31 slides from the shallow position of the inclined groove 311 to the deep position. The connecting shaft 33 on the outer disc 31 drives the blade 34 to rotate around the connecting shaft 33 on the inner disc 32. Thus, the inclination angle of the blade 34 is changed. The inclination angle of the blade 34 is increased. At the same rotating speed, the wind pressure of the wind volume pushed by the blade 34 is increased. The increased wind pressure is used to balance the external wind force. The indoor gas can be stably exhausted. Thus, the stability of the centrifugal fan is ensured. The reverse wind pressure of the external wind force is prevented from causing the gas backflow.

[0036] The power ring 351 is arrayed and embedded with a plurality of balls 354 at one end close to the impeller 3. The balls 354 are in rolling contact with the outer 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 disc 31.

[0037] The blade 34 is provided with a cleaning mechanism 36 for cleaning the blade 34. The cleaning mechanism 36 comprises a scraping rod 361, a power member and an anti-reverse member. The scraping rod 361 is slidingly installed on the end face of the blade 34. The end of the scraping rod 361 is clamped on the blade 34 to prevent the scraping rod 361 from falling off the blade 34. The power member is used to drive the scraping rod 361 to move. The power member is arranged on the connecting shaft 33 inserted into the inner disc 32. The power member comprises a winding wheel 362 and a steel wire rope 363. The winding wheel 362 is movably sleeved on the connecting shaft 33 on the inner disc 32. The steel wire rope 363 is wound on the winding wheel 362. The other end of the steel wire rope 363 is fixedly connected to the scraping rod 361.

[0038] The end of the connecting shaft 33 inserted into the inner disc 32 is provided with an anti-reverse member for preventing the connecting shaft 33 from being reversed. The anti-reverse member comprises a ratchet wheel 364 and a ratchet tooth 365. The ratchet wheel 364 is fixedly sleeved on the end of the connecting shaft 33. A plurality of ratchet teeth 365 are arranged on the outer side of the ratchet wheel 364. One end of the ratchet tooth 365 is hinged to the inner disc 32. The inner disc 32 is fixedly connected with an elastic member for pushing the ratchet tooth 365 to be clamped on the ratchet wheel 364.

[0039] The end of the connecting shaft 33 inserted into the chute 311 is sleeved with a clock spring 371, one end of the clock spring 371 is fixedly connected to the connecting shaft 33, the other end of the clock spring 371 is fixedly connected with a connecting belt 372, and the connecting belt 372 is wound outside the clock spring 371, and the other end of the connecting belt 372 is fixedly connected with the scraper rod 361.

[0040] When the external wind pressure changes, the thrust of the wind pressure on the wind shield 353 changes, in this process, the angle of rotation of the power ring 351 changes, and the pushing distance of the power ring 351 to the outer disc 31 also changes, so that the blade 34 rotates multiple times around the connecting shaft 33 on the inner disc 32, in the process of rotating the blade 34, due to the existence of large friction between the blade 34 and the connecting shaft 33 inserted into the inner disc 32, the blade 34 drives the connecting shaft 33 on the inner disc 32 to rotate synchronously, so that the connecting shaft 33 drives the winding wheel 362 to rotate synchronously, the rotating winding wheel 362 winds the steel wire rope 363, so that the other end of the steel wire rope 363 pulls the scraper rod 361 to move, and the moving scraper rod 361 scrapes the surface of the blade 34, so as to prevent the blade 34 from remaining dust of different quality, which causes the impeller 3 to vibrate when rotating.

[0041] The connecting shaft 33 inserted into the inner disc 32 has friction with the blade 34 and the winding wheel 362, when the connecting shaft 33 inserted into the inner disc 32 and the winding wheel 362 are not subjected to external force, the blade 34 can drive the connecting shaft 33 and the winding wheel 362 on the inner disc 32 to rotate synchronously.

[0042] The outer side of the ratchet 365 movably sleeved with an electromagnetic ring, and the electromagnetic ring is fixedly connected to the inner disc 32, the electromagnetic ring is electrically connected with the control device through the slip ring on the output shaft of the power motor 2, and the ratchet 365 is a permanent magnet; each time the control device energizes the electromagnetic ring outside the ratchet 365, the electromagnetic ring generates magnetic force to attract the ratchet 365, so that the ratchet 365 releases the limiting of the ratchet wheel 364, and under the action of the clock spring 371, the clock spring 371 pulls the connecting belt 372 and the scraper rod 361 to reset.

[0043] The connecting shaft 33 between the two winding wheels 362 is fixedly sleeved with a shaking disc 38, and the outer side of the shaking disc 38 is annularly arranged with a plurality of shaking blocks 381; when the scraper rod 361 is pulled to the shaking disc 38 by the rotating winding wheel 362, the scraper rod 361 cannot be pulled any more, at this time, when the blade 34 rotates, the blade 34 drives the shaking disc 38 and the shaking block 381 to rotate, the rotating shaking disc 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 cleaned, so as to prevent the dust remaining on the scraper rod 361 from affecting the cleaning of the blade 34 next time.

[0044] The working principle of the present application is as follows:

[0045] Please refer to Figures 1-9 When the pipeline centrifugal fan is used to exhaust indoor gas, the pipeline centrifugal fan is installed at the position of the outlet of the air duct. When the external wind force is opposite to the wind blown by the air duct, the external wind force blows towards the wind shield 353 at the same time. The external wind force pushes the wind shield 353, 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 screwed with the outer pipeline box 1 and the partition plate 11, the rotating power ring 351 moves towards the outer disc 31. The power ring 351 extrudes the outer disc 31. The outer disc 31 extrudes the connecting shaft 33 between the two outer discs 31. The end of the connecting shaft 33 on the outer disc 31 slides from the shallow position to the deep position of the inclined groove 311, so that the connecting shaft 33 on the outer disc 31 drives the blade 34 to rotate around the connecting shaft 33 on the inner disc 32, thereby changing the inclination angle of the blade 34. The inclination angle of the blade 34 increases. At the same speed, the wind pressure of the air volume pushed by the blade 34 increases. The increased wind pressure is used to balance the external wind force, so that the indoor gas can be stably exhausted, thereby ensuring the stability of the operation of the centrifugal fan and preventing the reverse wind pressure of the external wind force from causing gas backflow.

[0046] When the external wind pressure changes, the thrust of the wind pressure on the wind shield 353 changes. In this process, the angle of rotation of the power ring 351 changes, and the pushing distance of the power ring 351 to the outer disc 31 also changes, thereby causing the blade 34 to rotate around the connecting shaft 33 on the inner disc 32 multiple times. In the process of rotation of the blade 34, since there is a large friction force between the blade 34 and the connecting shaft 33 inserted into the inner disc 32, the blade 34 drives the connecting shaft 33 on the inner disc 32 to rotate synchronously, thereby causing the connecting shaft 33 to drive the winding wheel 362 to rotate synchronously. The rotating winding wheel 362 winds the steel wire rope 363, so that the other end of the steel wire rope 363 pulls the scraper 361 to move. The moving scraper 361 scrapes the surface of the blade 34, thereby preventing the blade 34 from storing dust of different qualities, which causes vibration when the impeller 3 rotates.

[0047] When the scraper 361 is pulled to the shaking disc 38 by the rotating winding wheel 362, the scraper 361 cannot be pulled any more. At this time, when the blade 34 rotates, the blade 34 drives the shaking disc 38 and the shaking block 381 to rotate. The rotating shaking disc 38 and the shaking block 381 cyclically lift the scraper 361, thereby causing the scraper 361 to shake and assisting in cleaning the dust remaining on the scraper 361, thereby preventing the dust remaining on the scraper 361 from affecting the cleaning of the blade 34 next time.

Claims

1. An adjustable centrifugal fan, comprising an outer duct casing (1), a power motor (2), an impeller (3) and a control device, the outer duct casing (1) comprising a partition plate (11), an inlet closing plate (12) and an outlet closing plate (13), characterized in that: The impeller (3) comprises: Two inner discs (32) are arranged in parallel, the inner disc (32) away from the motor (2) is fixedly sleeved on the output shaft of the motor (2), the inner disc (32) close to the motor (2) is movably sleeved on the output shaft of the motor (2), and a ventilation opening is formed in the middle of the inner disc (32) close to the motor (2); An outer disc (31) is movably clamped on the outer ring of the inner disc (32), and a plurality of inclined grooves (311) are formed on the opposite surfaces of the outer disc (31); A plurality of connecting shafts (33) are movably inserted into the inner disc (32) between the two inner discs (32) and the inclined grooves (311) between the two outer discs (31); A plurality of blades (34) are movably sleeved on the connecting shafts (33) between the inner discs (32) and the connecting shafts (33) between the outer discs (31); An outer power mechanism (35) is movably arranged on the outer pipeline box (1) and the partition plate (11) of the side wall of the impeller (3), and is used for driving the outer disc (31) to move under the external wind power; The inclined grooves (311) on the outer disc (31) are arc-shaped grooves, the inclined grooves (311) are grooves with one end shallow and the other end deep, and in the initial state, the end portion of the connecting shaft (33) at the outer end of the impeller (3) is located at the shallow end of the inclined groove (311); The outer power mechanism (35) comprises: A power ring (351) is provided with a plurality of external threads on the outer wall, and is threadedly connected with the outer pipeline box (1) and the partition plate (11) of the side wall of the impeller (3); A connecting column (352) is fixedly connected to the top end of the side, away from the impeller (3), of the power ring (351); A wind shield (353) is fixedly connected to the top end of the connecting column (352).

2. A centrifugal fan according to claim 1, wherein: The outer power mechanism (35) further comprises: A plurality of reset springs are fixedly connected to the two sides of the wind shield (353) at one end, and are fixedly connected to the outer pipeline box (1) at the other end.

3. A centrifugal fan according to claim 1, wherein: A plurality of balls (354) are arranged and embedded in the end of the power ring (351) close to the impeller (3), and the balls (354) are in rolling contact with the outer disc (31).

4. The adjustable centrifugal fan of claim 1, wherein: A cleaning mechanism (36) for cleaning the blades (34) is arranged on the blades (34), and the cleaning mechanism (36) comprises: A scraping rod (361) is slidingly installed on the end surface of the blade (34); A power member comprises a winding wheel (362) and a steel wire rope (363), the winding wheel (362) is movably sleeved on the connecting shaft (33) at both ends of the inner disc (32), the steel wire rope (363) is wound on the winding wheel (362), and the other end of the steel wire rope (363) is fixedly connected to the scraping rod (361); An anti-reverse member is arranged on the end portion of the connecting shaft (33) inserted into the inner disc (32) to prevent the reverse rotation of the connecting shaft (33).

5. An adjustable centrifugal fan according to claim 4, wherein: The anti-reverse member comprises: A ratchet wheel (364) is fixedly sleeved on the end portion of the connecting shaft (33); A plurality of ratchet teeth (365) are arranged on the outer side of the ratchet wheel (364) and are hingedly connected to the inner disc (32) at one end. The elastic member is fixedly connected to the inner wheel disc (32) and is used for pushing the ratchet (365) to be clamped on the ratchet wheel (364).

6. A centrifugal fan according to claim 5, wherein: The end of the connecting shaft (33) inserted into the chute (311) is sleeved with a clock spring (371), one end of the clock spring (371) is fixedly connected to the connecting shaft (33), the other end of the clock spring (371) is fixedly connected with a connecting belt (372), the connecting belt (372) is wound outside the clock spring (371), and the other end of the connecting belt (372) is fixedly connected with the scraping rod (361).

7. An adjustable centrifugal fan according to claim 6, wherein: The outer side of the ratchet (365) movably sleeves an electromagnetic ring, the electromagnetic ring is fixedly connected to the inner wheel disc (32), the electromagnetic ring is electrically connected with the control device through the slip ring on the output shaft of the power motor (2), and the ratchet (365) is a permanent magnet block.

8. A centrifugal fan according to claim 6, wherein: 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 annularly arranged on the outer side of the shaking disc (38).

Images