Fan

Abstract

The present invention discloses a fan, which includes a main shaft, an impeller, an adjustment plate and a driving device. The impeller is installed on the main shaft, the adjustment plate is located inside the impeller and is slidably arranged on the main shaft, and the driving device drives the adjustment plate to slide along the axial direction of the main shaft. An adjustment plate is arranged inside the impeller, and the driving device drives the adjustment plate to slide along the direction of the main shaft, which is used to adjust the actual working area of ​​the impeller, thereby changing the air volume of the fan. There is no need to adjust the air volume by adjusting the speed of the fan or adjusting the size of the air inlet and the air outlet as in the traditional fan, so that the fan always works at the most efficient speed point, while saving energy and reducing noise. The adjustment plate divides the inner cavity of the impeller into two cavities, the cavity close to the air inlet is connected with the air inlet, driving the air flow to flow and do work, and the cavity far away from the air inlet is not connected with the air inlet. When the impeller rotates, there is no air flow drive and no work is done, so that the fan can always work at the most efficient speed point.

Description

Technical Field

[0001] The invention relates to a fan. Background Art

[0002] In order to adapt to different working conditions, existing fans generally use DC variable frequency fans to control the air volume by changing the speed. This type of fan that adjusts the air volume by changing the speed cannot ensure that the fan always operates at the most efficient speed point, resulting in high energy consumption and low economic efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a fan in order to overcome the problem in the prior art that the fan cannot always operate at the most efficient rotation speed point when adjusting the air volume.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] A fan comprises a main shaft, an impeller, an adjustment plate and a driving device, wherein the impeller is mounted on the main shaft, the adjustment plate is located inside the impeller and is slidably mounted on the main shaft, and the driving device drives the adjustment plate to slide along the axial direction of the main shaft.

[0006] In this solution, the fan is provided with an adjustment plate inside the impeller, and the driving device drives the adjustment plate to slide along the main axis to adjust the actual working area of ​​the impeller, thereby changing the air volume of the fan. There is no need to adjust the air volume by adjusting the speed of the fan or adjusting the size of the air inlet and the air outlet as in the traditional fan, so that the fan always works at the most efficient speed point, saving energy while reducing noise. The adjustment plate divides the inner cavity of the impeller into two cavities, wherein the cavity close to the air inlet is connected to the air inlet. When the impeller rotates, the airflow is driven to flow and do work. Due to the obstruction of the adjustment plate, the cavity far from the air inlet is not connected to the air inlet. When the impeller rotates, there is no airflow drive and no work is done, so that the fan can always work at the most efficient speed point, thus saving energy.

[0007] Preferably, the impeller includes an upper plate, a lower plate and a plurality of blades, the plurality of blades are evenly spaced on the upper plate and the lower plate along the circumferential direction of the impeller, the two ends of each blade are respectively connected to the upper plate and the lower plate, and the lower plate is sleeved and connected to the main shaft.

[0008] In this solution, an upper plate, a lower plate and several blades are assembled into an impeller. The lower plate is connected to the main shaft, and the main shaft is connected to the motor. The motor drives the main shaft to rotate, and the main shaft drives the impeller to rotate through the lower plate. When the impeller rotates, the blades on the impeller drive the air to form wind.

[0009] Preferably, the adjustment plate comprises a disc body and a plurality of protrusions, wherein the plurality of protrusions are arranged at intervals along the circumferential direction of the disc body, and the protrusions are embedded in the gaps between adjacent blades.

[0010] In this solution, the adjustment plate is connected to the blades through the raised portion, so that the adjustment plate rotates synchronously with the impeller, thereby preventing the adjustment plate from vibrating and generating noise when the impeller rotates.

[0011] Preferably, the adjustment plate further comprises a sealing member, the inner side of the sealing member is connected to the peripheral edges of the disc body, and the outer side of the sealing member abuts against the blade.

[0012] In this solution, the seal is used to seal the gap between the adjustment plate and the blades to divide the inner cavity of the impeller into two sealed cavities to prevent turbulence from forming and reduce work efficiency.

[0013] Preferably, the sealing member can be expanded and contracted along the radial direction of the disc body.

[0014] In this solution, the above-mentioned structural form is adopted to facilitate the sealing member to adapt to blades of variable diameter sizes and improve the sealing effect.

[0015] Preferably, the blade includes a main body and an extension portion, the cross-section of the main body is an arc-shaped structure, the main body has a blade front end and a blade rear end, the extension portion is connected to the rear end of the blade and faces the edge of the windward side, and the extension portion smoothly extends and protrudes from the main body toward the windward direction.

[0016] In this solution, as the wind enters the impeller from the air inlet and flows to the rear end of the blade through the front end of the blade, the wind volume is the largest when the wind reaches the rear end of the blade. An extension portion is provided at the rear end of the blade, and the extension portion smoothly extends from the main body toward the windward direction, thereby increasing the working area of ​​the blade and improving the working efficiency of the blade. The arc-shaped structure of the blade also allows the wind to flow smoothly through the blade without generating vortex shedding, thereby reducing the noise generated between the blade and the wind.

[0017] Preferably, the cross-sectional dimension of the extension portion gradually increases from the front end of the blade to the rear end of the blade.

[0018] In this solution, the above-mentioned structural setting is adopted to facilitate the wind to flow from the air inlet through the front end of the blade to the rear end of the blade. When the wind reaches the rear end of the blade, the wind volume is the largest, and the cross-sectional size of the extension part gradually increases from the front end of the blade to the rear end of the blade, thereby simplifying the structure of the blade and improving economic benefits.

[0019] Preferably, the arc structure has an installation axis and a first arc portion and a second arc portion respectively located on both sides of the installation axis, the first arc portion is located on the windward side, the second arc portion is located on the leeward side, the radial dimension of the first arc portion is greater than the radial dimension of the second arc portion, and the extension portion is connected to the edge of the first arc portion.

[0020] In this solution, the above-mentioned structural form is adopted, and arc portions of arc structure are arranged on both sides of the installation axis, so that when the wind flows through the blade, it is not easy to generate vortex shedding, which is convenient for the blade to drive more wind and improve efficiency. The size of the first arc portion on the windward side is larger than that on the leeward side, so that a large amount of wind from the air inlet is driven to the air outlet by the blade.

[0021] Preferably, the driving device includes a permanent magnet, a coil and an elastic component, the permanent magnet is connected to the adjustment plate, the coil is arranged corresponding to the permanent magnet, and two ends of the elastic component act on the main shaft and the adjustment plate respectively.

[0022] In this scheme, the coil, the permanent magnet and the elastic component constitute a driving device, and the permanent magnet and the coil are arranged correspondingly. The coil can generate magnetism and magnetic poles when energized. The magnetic poles generated by the permanent magnet and the energized coil are opposite, so they attract each other. When the coil is energized, as the amount of electricity increases, the attractive force generated between the two becomes larger and larger, so the permanent magnet is attracted to move toward the direction close to the coil, and the adjustment plate connected to the permanent magnet is also driven to move; when the amount of electricity in the coil decreases, the attraction between the two is weakened, and the elastic component arranged between the two will give a force to the permanent magnet, causing the permanent magnet to slide and thereby drive the adjustment plate to move, thereby realizing the adjustment of the adjustment plate.

[0023] Preferably, the elastic component includes a first elastic member and a second elastic member, the adjustment plate is located between the first elastic member and the second elastic member, one end of the first elastic member acts on the adjustment plate, the other end of the first elastic member acts on the main shaft, one end of the second elastic member acts on the adjustment plate, and the other end of the second elastic member acts on the main shaft.

[0024] In this solution, the adjustment plate is fixed in the middle position by the first elastic member and the second elastic member. No matter the adjustment plate slides in the direction of the first elastic member or the second elastic member, the first elastic member and the second elastic member can provide force at the same time, so that the adjustment plate is evenly stressed, thereby improving the stability of the adjustment plate when sliding.

[0025] Preferably, the driving device further comprises an intelligent control board, which is electrically connected to the coil and is used to control the magnitude and direction of the current input into the coil.

[0026] In this solution, since the intelligent control board is electrically connected to the coil, the intelligent control board inputs the corresponding current size and direction according to the air volume required by the fan to control the sliding displacement of the adjustment plate, thereby achieving the purpose of adjusting the air volume. Remote control and automated operation can be achieved through the intelligent control board.

[0027] Preferably, a surface of the adjustment plate is perpendicular to the axis of the main shaft, and an edge of the adjustment plate is slidably disposed on the inner wall of the impeller along the axial direction of the impeller;

[0028] Alternatively, a surface of the adjustment plate is perpendicular to the axis of the main shaft, and an edge of the adjustment plate is disposed adjacent to an inner wall of the impeller.

[0029] In this solution, one surface of the adjustment plate is perpendicular to the axis of the main shaft. When the adjustment plate rotates, the volume of the cavity surrounded by the adjustment plate near the air inlet is constant to maintain a smooth and constant output.

[0030] Preferably, the fan comprises a shell, an air inlet is arranged on one end surface of the shell, an air outlet is arranged on an outer peripheral surface of the shell, and the impeller is installed in the inner cavity of the shell, with the end surface of the impeller facing the air inlet.

[0031] In this solution, external wind enters the inner cavity of the shell through the air inlet arranged on the end surface of the shell, and then turns to flow to the air outlet on the outer peripheral surface of the shell after being driven by the impeller.

[0032] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0033] The positive and progressive effect of the present invention is that the fan is provided with an adjustment plate inside the impeller, and the driving device drives the adjustment plate to slide along the direction of the main axis to adjust the actual working area of ​​the impeller, thereby changing the air volume of the fan. There is no need to adjust the air volume by adjusting the speed of the fan or adjusting the size of the air inlet and the air outlet as in the traditional fan, so that the fan always works at the most efficient speed point, saving energy while also reducing noise. The adjustment plate divides the inner cavity of the impeller into two cavities, wherein the cavity close to the air inlet is connected to the air inlet, and when the impeller rotates, the airflow is driven to flow and do work. Due to the obstruction of the adjustment plate, the cavity far from the air inlet is not connected to the air inlet, and when the impeller rotates, there is no airflow drive and no work is done, so that the fan can always work at the most efficient speed point, thus saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of the fan according to Example 1 of the present invention (I).

[0035] Figure 2 This is a schematic structural diagram of the fan of Example 1 of the present invention (II).

[0036] Figure 3 for Figure 2 Sectional view along line AA.

[0037] Figure 4 This is a schematic structural diagram of the fan of Example 1 of the present invention (III).

[0038] Figure 5 for Figure 4 Sectional view along line BB.

[0039] Figure 6 This is a schematic diagram of the structure of the fan behind the hidden casing according to Example 1 of the present invention.

[0040] Figure 7 This is a schematic diagram of the blade structure of the fan according to Example 1 of the present invention (I).

[0041] Figure 8 This is a schematic diagram of the blade structure of the fan according to Example 1 of the present invention (II).

[0042] Fig. 9 This is a schematic diagram of the structure of the fan behind the hidden casing according to Example 2 of the present invention.

[0043] Description of reference numerals:

[0044] Spindle 1

[0045] Impeller 2

[0046] Upper plate 21

[0047] Lower plate 22

[0048] Blade 23

[0049] Main body part 231

[0050] Extension 232

[0051] Blade front end 233

[0052] Blade rear end 234

[0053] Installation axis 235

[0054] First arc portion 236

[0055] Second arc portion 237

[0056] Adjustment plate 3

[0057] Disc body 31

[0058] Raised portion 32

[0059] Seal 33

[0060] Drive device 4

[0061] Permanent magnet 41

[0062] Coil 42

[0063] Elastic component 43

[0064] The first elastic member 431

[0065] The second elastic member 432

[0066] Shell 5

[0067] Motor 6

[0068] Air Inlet 51

[0069] Air outlet 52

[0070] Windward side 100

[0071] Leeward side 200 DETAILED DESCRIPTION

[0072] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0073] Example 1

[0074] like Figure 1-Figure 8 As shown, this embodiment discloses a fan, which includes a main shaft 1, an impeller 2, an adjustment plate 3 and a driving device 4. The impeller 2 is installed on the main shaft 1, the adjustment plate 3 is located inside the impeller 2 and is slidably arranged on the main shaft 1, and the driving device 4 drives the adjustment plate 3 to slide along the axial direction of the main shaft 1. The fan is provided with an adjustment plate 3 inside the impeller 2, and the driving device 4 drives the adjustment plate 3 to slide along the direction of the main shaft 1, so as to adjust the actual working area of ​​the impeller 2, thereby changing the air volume of the fan, and there is no need to adjust the air volume by adjusting the speed of the fan or adjusting the size of the air inlet 51 and the air outlet 52 as in the traditional fan, so that the fan always works at the most efficient speed point, saving energy while also reducing noise. The adjusting plate 3 divides the inner cavity of the impeller 2 into two cavities, wherein the cavity close to the air inlet 51 is connected with the air inlet 51. When the impeller 2 rotates, the airflow is driven to flow and do work. Due to the obstruction of the adjusting plate 3, the cavity far away from the air inlet 51 is not connected with the air inlet 51. When the impeller 2 rotates, there is no airflow drive and no work is done. The fan can always operate at the most efficient speed point, thereby saving energy.

[0075] like Figure 1As shown, the fan further includes a housing 5, an air inlet 51 is provided on one end face of the housing 5, an air outlet 52 is provided on the outer peripheral face of the housing 5, and an impeller 2 is installed in the inner cavity of the housing 5, with the end face of the impeller 2 facing the air inlet 51. External wind enters the inner cavity of the housing 5 through the air inlet 51 provided on the end face of the housing 5, and then turns to flow to the air outlet 52 on the outer peripheral face of the housing 5 after being driven by the impeller 2.

[0076] like Figure 5 and Figure 6 As shown, specifically, the impeller 2 includes an upper plate 21, a lower plate 22 and a plurality of blades 23, the plurality of blades 23 are evenly spaced and arranged on the upper plate 21 and the lower plate 22 along the circumferential direction of the impeller 2, the two ends of each blade 23 are respectively connected to the upper plate 21 and the lower plate 22, and the lower plate 22 is sleeved and connected to the main shaft 1. The upper plate 21, the lower plate 22 and the plurality of blades 23 are assembled into the impeller 2, the lower plate 22 is connected to the main shaft 1, the main shaft 1 is connected to the motor 6, the motor 6 drives the main shaft 1 to rotate, the main shaft 1 drives the impeller 2 to rotate through the lower plate 22, and when the impeller 2 rotates, the blades 23 on the impeller 2 drive the air to form wind.

[0077] like Figure 3 As shown, the adjustment plate 3 includes a disc body 31 and a plurality of protrusions 32, the plurality of protrusions 32 are arranged at intervals along the circumferential direction of the disc body 31, and the protrusions 32 are embedded in the gaps between adjacent blades 23. The adjustment plate 3 is connected to the blades 23 through the protrusions 32, so that the adjustment plate 3 rotates synchronously with the impeller 2, thereby preventing the adjustment plate 3 from vibrating and generating noise when the impeller 2 rotates.

[0078] like Figure 3 and Figure 5 As shown, the adjustment plate 3 also includes a seal 33, the inner side of the seal 33 is connected to the edges of the disc body 31, and the outer side of the seal 33 abuts against the blade 23. The seal 33 is used to seal the gap between the adjustment plate 3 and the blade 23, so as to divide the inner cavity of the impeller 2 into two sealed cavities to prevent turbulence from forming and reduce work efficiency. Preferably, the seal 33 can be extended and retracted in the radial direction of the disc body 31, so that the seal 33 can adapt to the blades 23 of variable diameters and improve the sealing effect.

[0079] like Figure 7 and Figure 8 As shown, the blade 23 includes a main body 231 and an extension 232. The cross section of the main body 231 is an arc-shaped structure. The main body 231 has a blade front end 233 and a blade rear end 234. The extension 232 is connected to the blade rear end 234 and faces the edge of the windward side 100. The extension 232 smoothly extends and protrudes from the main body 231 toward the windward direction. Figure 5 and Figure 6As shown, since the wind enters the impeller 2 from the air inlet 51, it flows through the front end 233 of the blade to the rear end 234 of the blade. When the wind reaches the rear end 234 of the blade, the wind volume is the largest. An extension portion 232 is provided at the rear end 234 of the blade. The extension portion 232 smoothly extends from the main body 231 toward the windward direction, thereby increasing the working area of ​​the blade 23 and improving the working efficiency of the blade 23. The arc-shaped structure of the blade 23 also allows the wind to flow smoothly through the blade 23 without generating vortex shedding, thereby reducing the noise generated between the blade 23 and the wind.

[0080] like Figure 5-Figure 7 As shown, preferably, the cross-sectional dimension of the extension portion 232 gradually increases from the blade front end 233 to the blade rear end 234, so that the wind flows from the air inlet 51 through the blade front end 233 to the blade rear end 234. When the wind reaches the blade rear end 234, the wind volume is maximum. The cross-sectional dimension of the extension portion 232 gradually increases from the blade front end 233 to the blade rear end 234, thereby simplifying the structure of the blade 23 and improving the economic benefits.

[0081] like Figure 7 and Figure 8 As shown, the main body 231 of the arc structure has an installation axis 235 and a first arc portion 236 and a second arc portion 237 respectively located on both sides of the installation axis 235. The first arc portion 236 is located on the windward side 100, and the second arc portion 237 is located on the leeward side 200. The radial dimension of the first arc portion 236 is greater than the radial dimension of the second arc portion 237, and the extension portion 232 is connected to the edge of the first arc portion 236. The arc portions of the arc structure are arranged on both sides of the installation axis 235, so that when the wind flows through the blade 23, it is not easy to generate vortex shedding, which facilitates the blade 23 to drive more wind and improve efficiency. The size of the first arc portion 236 on the windward side 100 is greater than that on the leeward side 200, so that a large amount of wind from the air inlet 51 is driven to the air outlet 52 by the blade 23. The two ends of the main body 231 are respectively provided with clamping parts, and the blade 23 is respectively connected to the upper plate 21 and the lower plate 22 through the two clamping parts. The two clamping portions are both located on the installation axis 235 .

[0082] like Figure 5As shown, in this embodiment, the driving device 4 includes a permanent magnet 41, a coil 42 and an elastic component 43, the permanent magnet 41 is connected to the adjustment plate 3, the coil 42 is arranged corresponding to the permanent magnet 41, and the two ends of the elastic component 43 act on the main shaft 1 and the adjustment plate 3 respectively. The coil 42, the permanent magnet 41 and the elastic component 43 constitute the driving device 4, and the permanent magnet 41 and the coil 42 are arranged correspondingly, and the coil 42 can generate magnetism and magnetic poles when energized. If the magnetic poles generated by the permanent magnet 41 and the coil 42 after energization are opposite, they attract each other. When the coil 42 is energized, as the amount of electricity increases, the attractive force generated between the two becomes larger and larger, so the permanent magnet 41 is attracted to move toward the direction close to the coil 42, and the adjustment plate 3 connected to the permanent magnet 41 is also driven to move; and when the amount of electricity in the coil 42 decreases, the attraction between the two is weakened, and the elastic component 43 arranged between the two will give the permanent magnet 41 a force, causing the permanent magnet 41 to slide, thereby driving the adjustment plate 3 to move, and the adjustment of the adjustment plate 3 is achieved. If the permanent magnet 41 and the coil 42 after power-on generate the same magnetic pole, they repel each other, making it easier to adjust the adjustment plate 3 in the reverse direction.

[0083] like Figure 5 As shown, specifically, the elastic component 43 includes a first elastic member 431 and a second elastic member 432, and the adjustment plate 3 is located between the first elastic member 431 and the second elastic member 432. One end of the first elastic member 431 acts on the adjustment plate 3, and the other end of the first elastic member 431 acts on the main shaft 1. One end of the second elastic member 432 acts on the adjustment plate 3, and the other end of the second elastic member 432 acts on the main shaft 1. The adjustment plate 3 is fixed in the middle position by the first elastic member 431 and the second elastic member 432. Regardless of whether the adjustment plate 3 slides in the direction of the first elastic member 431 or the second elastic member 432, the first elastic member 431 and the second elastic member 432 can provide a force at the same time, so that the adjustment plate 3 is evenly stressed, and the stability of the adjustment plate 3 when sliding is improved.

[0084] In order to realize automatic control, the driving device 4 further includes an intelligent control board (not shown in the figure), which is electrically connected to the coil 42 and is used to control the magnitude and direction of the current input into the coil 42. Since the intelligent control board is electrically connected to the coil 42, the intelligent control board inputs the corresponding magnitude and direction of the current according to the air volume required by the fan to control the sliding displacement of the adjustment plate 3, thereby achieving the purpose of adjusting the air volume. Remote control and automatic operation can be realized through the intelligent control board.

[0085] Of course, in other alternative embodiments, the driving device may also be a stepper motor or a lever drive.

[0086] like Figure 5 and Figure 6As shown, in this embodiment, one surface of the adjustment plate 3 is perpendicular to the axis of the main shaft 1. When the adjustment plate 3 rotates, the volume of the cavity surrounded by the adjustment plate 3 near the air inlet 51 is constant to maintain a stable and constant output. The edge of the adjustment plate 3 is slidably arranged on the inner wall of the impeller 2 along the axial direction of the impeller 2, and the adjustment plate 3 rotates synchronously with the impeller 2.

[0087] Example 2

[0088] like Fig. 9 As shown, this embodiment is basically the same as the embodiment 1, except that the edge of the adjustment plate 3 is arranged close to the inner wall of the impeller 2, the adjustment plate 3 is mounted on the main shaft 1 through a bearing, and the adjustment plate 3 does not rotate with the impeller 2 to reduce vibration and noise. Of course, in other embodiments, the adjustment plate can also be arranged to rotate synchronously with the impeller.

[0089] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A fan, characterized in that: The fan comprises a main shaft, an impeller, an adjustment plate and a driving device, wherein the impeller is mounted on the main shaft, the adjustment plate is located inside the impeller and is slidably mounted on the main shaft, and the driving device drives the adjustment plate to slide along the axial direction of the main shaft; The impeller comprises an upper plate, a lower plate and a plurality of blades, wherein the plurality of blades are evenly spaced and arranged on the upper plate and the lower plate along the circumferential direction of the impeller, and the two ends of each blade are respectively connected to the upper plate and the lower plate, and the lower plate is sleeved and connected to the main shaft; The adjusting plate comprises a disc body and a plurality of protrusions, wherein the plurality of protrusions are arranged at intervals along the circumferential direction of the disc body, and the protrusions are embedded in the gaps between adjacent blades; The regulating plate further comprises a sealing member, the inner side of the sealing member is connected to the peripheral edges of the disc body, and the outer side of the sealing member abuts against the blade; The sealing member can be extended and retracted along the radial direction of the disc body.

2. The fan according to claim 1, characterized in that: The blade includes a main body and an extension portion. The cross-section of the main body is an arc-shaped structure. The main body has a blade front end and a blade rear end. The extension portion is connected to the rear end of the blade and faces the edge of the windward side. The extension portion smoothly extends and protrudes from the main body toward the windward direction.

3. The fan according to claim 2, characterized in that: The cross-sectional dimension of the extension portion gradually increases from the front end of the blade to the rear end of the blade.

4. The fan according to claim 2, characterized in that: The arc structure has an installation axis and a first arc portion and a second arc portion respectively located on both sides of the installation axis, the first arc portion is located on the windward side, the second arc portion is located on the leeward side, the radial dimension of the first arc portion is greater than the radial dimension of the second arc portion, and the extension portion is connected to the edge of the first arc portion.

5. The fan according to claim 1, characterized in that: The driving device comprises a permanent magnet, a coil and an elastic component. The permanent magnet is connected to the adjustment plate, the coil is arranged corresponding to the permanent magnet, and two ends of the elastic component act on the main shaft and the adjustment plate respectively.

6. The fan according to claim 5, characterized in that: The elastic component includes a first elastic member and a second elastic member, the adjustment plate is located between the first elastic member and the second elastic member, one end of the first elastic member acts on the adjustment plate, the other end of the first elastic member acts on the main shaft, one end of the second elastic member acts on the adjustment plate, and the other end of the second elastic member acts on the main shaft.

7. The fan according to claim 5, characterized in that: The driving device further comprises an intelligent control board, which is electrically connected to the coil and is used to control the magnitude and direction of the current input into the coil.

8. The fan according to claim 1, characterized in that: A surface of the adjustment plate is perpendicular to the axis of the main shaft, and an edge of the adjustment plate is slidably disposed on the inner wall of the impeller along the axial direction of the impeller; Alternatively, a surface of the adjustment plate is perpendicular to the axis of the main shaft, and an edge of the adjustment plate is disposed adjacent to an inner wall of the impeller.

9. The fan according to any one of claims 1 to 8, characterized in that: The fan comprises a shell, an air inlet is arranged on one end surface of the shell, an air outlet is arranged on the outer peripheral surface of the shell, and the impeller is installed in the inner cavity of the shell, with the end surface of the impeller facing the air inlet.

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