Fan

Abstract

The utility model discloses a fan. The fan comprises a driving assembly, a first-stage fan blade assembly and a second-stage fan blade assembly, the driving assembly is provided with a transmission shaft, the first-stage fan blade assembly comprises first fan blades and is connected with the driving assembly, the driving assembly is used for driving the first fan blades to rotate, and the first fan blades are provided with windless zone areas; the second-stage fan blade assembly is located on the side, away from the driving assembly, of the first-stage fan blade assembly, the second-stage fan blade assembly comprises second fan blades, the diameter of the second fan blades is smaller than that of the first fan blades, rotation of the second fan blades is caused by blowing of the first fan blades during rotation, and at least one part of the windless zone area of the first fan blades has wind; rotation of the second fan blades of the fan is only caused by blowing of the first fan blades and is not caused by rotation of the transmission shaft, so that the load of the driving assembly is not increased by the second-stage fan blade assembly, namely, power consumption of the fan is not increased, energy consumption of the fan is saved, and the second-stage fan blade assembly is simple in structure and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to cooling system technical field, specifically, relate to a fan. BACKGROUND

[0002] At present, in the engine cooling system, fan is often used for cooling. The fan in the related art comprises a driving assembly, a large fan blade and a small fan blade, wherein the large fan blade and the small fan blade are coaxially arranged on the output end of the driving assembly, so that the driving assembly can drive the large fan blade and the small fan blade to rotate simultaneously. The structure of the fan increases the load of the driving assembly due to the addition of the small fan blade, resulting in increased energy consumption of the driving assembly. SUMMARY

[0003] The utility model aims at solving at least partial problems.

[0004] To achieve this purpose, the utility model provides a fan, which comprises:

[0005] A driving assembly, the driving assembly has a transmission shaft;

[0006] A primary fan blade assembly, the primary fan blade assembly comprises a first fan blade and is connected with the driving assembly, the driving assembly is used for driving the first fan blade to rotate, and the first fan blade has a windless zone; and

[0007] A secondary fan blade assembly, the secondary fan blade assembly is located on the side, away from the driving assembly, of the primary fan blade assembly, and the secondary fan blade assembly comprises a second fan blade;

[0008] The diameter of the second fan blade is smaller than the diameter of the first fan blade, the rotation of the second fan blade is caused by blowing of the first fan blade when the first fan blade rotates, and at least part of the windless zone of the first fan blade is made to have wind.

[0009] The rotation of the second fan blade of the fan is caused only by blowing of the first fan blade, and is not caused by rotation of the transmission shaft, therefore, the secondary fan blade assembly does not increase the load of the driving assembly, i.e. does not increase the power consumption of the fan, which is beneficial to saving the energy consumption of the fan, and the secondary fan blade assembly has simple structure and low cost. Meanwhile, the first fan blade can blow the second fan blade to rotate, which is beneficial to improving the air volume of the fan.

[0010] As an optional solution, the secondary fan blade assembly further comprises a secondary bearing, the secondary bearing is sleeved on the transmission shaft, and the second fan blade is installed on the transmission shaft through the secondary bearing.

[0011] The second fan blade assembly is connected with the transmission shaft through the second bearing, and the transmission shaft cannot directly drive the second fan blade to rotate when the first fan blade is driven to rotate, so that the second fan blade assembly does not increase the load of the driving assembly, which is beneficial to save the energy consumption of the fan, and the structure of the second bearing is simple and the cost is low.

[0012] As an optional solution, the first fan blade and the second fan blade are mounted on the transmission shaft, and the second fan blade is close to the first fan blade in the axial direction of the transmission shaft.

[0013] The fan is close to the first fan blade through the second fan blade, so that the first fan blade is more easily to blow the second fan blade, which is beneficial to improve the air volume.

[0014] As an optional solution, the second fan blade assembly further comprises:

[0015] The second mounting frame is sleeved on the second bearing.

[0016] The second fan blade is connected with the second mounting frame.

[0017] The second mounting frame is used for mounting and fixing the second fan blade, which is beneficial to improve the structural stability of the second fan blade during rotation.

[0018] As an optional solution, the diameter of the second fan blade is greater than the diameter of the windless zone of the first fan blade, so that the second fan blade at least partially corresponds to the non-windless zone of the first fan blade, so that the first fan blade can more easily blow the second fan blade to rotate, and the purpose of supplementing the windless zone of the first fan blade by the second fan blade is achieved.

[0019] As an optional solution, the first fan blade assembly comprises:

[0020] The first mounting frame is connected with the driving assembly; and

[0021] The first fan blade is connected with the first mounting frame.

[0022] The first mounting frame is used for mounting and fixing the first fan blade, so that the rotation of the driving assembly can drive the first mounting frame to rotate, and then drive the first fan blade to rotate.

[0023] As an optional solution, the driving assembly further comprises:

[0024] The driving wheel is connected with the first mounting frame through bolts.

[0025] The driving wheel directly drives the first mounting frame to rotate, so as to drive the first fan blade to rotate, which is beneficial to improve the stability of the rotation of the first fan blade.

[0026] As an option, the transmission shaft is arranged in the driving wheel, and the transmission shaft is in interference fit with the driving wheel.

[0027] The fan can drive the driving wheel to rotate, and drive the transmission shaft to rotate synchronously.

[0028] As an option, the primary fan blade assembly further comprises:

[0029] The primary bearing is sleeved on the transmission shaft, and the primary mounting frame is sleeved on the primary bearing.

[0030] The primary bearing and the driving wheel jointly support the first fan blade, so as to improve the structural stability of the first fan blade and avoid deformation of the first fan blade during high-speed rotation.

[0031] As an option, the fan further comprises:

[0032] The tertiary mounting frame; and

[0033] The tertiary bearing is embedded in the tertiary mounting frame, and one end of the transmission shaft is arranged in the tertiary bearing.

[0034] The tertiary mounting frame and the tertiary bearing are used for fixing the primary fan blade assembly and the secondary fan blade assembly, so as to improve the structural stability of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0036] Figure 1 is a three-dimensional schematic diagram of the fan provided by the embodiment of the present application Figure One ;

[0037] Figure 2 is an exploded schematic diagram of the fan provided by the embodiment of the present application

[0038] Figure 3 is a schematic diagram of a no-wind zone of a fan provided by an embodiment of the present application;

[0039] Figure 4 is a structural schematic diagram of a fan provided by an embodiment of the present application Figure Two .

[0040] Reference signs:

[0041] 100, drive assembly; 110, transmission shaft; 120, drive wheel;

[0042] 200, primary fan blade assembly; 210, first fan blade; 211, first blade; 220, primary mounting frame; 221, fixed portion; 222, mounting portion; 223, connecting sleeve; 230, primary bearing;

[0043] 300, secondary fan blade assembly; 310, second fan blade; 311, second blade; 320, secondary bearing; 330, secondary mounting frame;

[0044] 400, tertiary mounting frame; 500, tertiary bearing. DETAILED DESCRIPTION

[0045] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0046] The present embodiment provides a fan. The fan can be applied to an engine cooling system, and the present embodiment is described by taking the fan applied to the cooling system.

[0047] As shown in Figure 1 , the fan includes a drive assembly 100 and a primary fan blade assembly 200. The drive assembly 100 has a transmission shaft 110, the primary fan blade assembly 200 includes a first fan blade 210 and is connected with the drive assembly 100, and the drive assembly 100 is used to drive the first fan blade 210 to rotate, thereby disturbing air through the primary fan blade assembly 200 to provide air volume to achieve a cooling effect.

[0048] When the cooling system requires a small air volume, the rotation speed of the primary fan blade assembly 200 is low. When the cooling system requires a large air volume, the rotation speed of the primary fan blade assembly 200 is high.

[0049] In some embodiments, the first fixing member can be used to connect the primary fan blade assembly 200 and the driving assembly 100. The connection can be detachable or fixed. For example, when the first fixing member is a bolt or screw, the primary fan blade assembly 200 and the driving assembly 100 can be detachably connected. The bolt and screw are commonly used fasteners, which are easy to purchase and have low cost. When the first fixing member is a pin or rivet, the primary fan blade assembly 200 and the driving assembly 100 are fixedly connected, which is beneficial to improve the stability of the fan structure.

[0050] For example, in the embodiment, the primary fan blade assembly 200 and the driving assembly 100 are detachably connected by the bolt, which is beneficial to improve the connection strength and the structural stability. Of course, in other embodiments, the primary fan blade assembly 200 and the driving assembly 100 can be connected by other first fixing members, which are not limited in the embodiment.

[0051] The details of the driving assembly 100 of the embodiment will be described below. Figures 1-2 The details of the driving assembly 100 of the embodiment will be described below.

[0052] As shown in Figures 1-2 , the driving assembly 100 includes a driving wheel 120, which is connected with the primary fan blade assembly 200 to drive the primary fan blade assembly 200 to rotate.

[0053] Optionally, the driving wheel 120 is a belt wheel. Of course, the driving wheel can also be a gear or a chain wheel, so that the external power source can be arranged transversely with the output of the driving assembly 100, which is beneficial to shorten the axial length of the fan, reduce the requirement of the fan on the installation space, and expand the application range of the fan.

[0054] In the embodiment, the driving wheel 120 is a belt wheel, which is connected with the power source by a belt.

[0055] As an optional solution, the transmission shaft 110 penetrates the driving wheel 120, and the primary fan blade assembly 200 is sleeved on the transmission shaft 110. Meanwhile, the transmission shaft 110 is in interference fit with the driving wheel 120, so that the driving wheel 120 rotates to drive the transmission shaft 110 to rotate synchronously. The transmission shaft 110 supports and fixes the driving wheel 120, which is beneficial to improve the structural stability of the fan.

[0056] The details of the primary fan blade assembly 200 will be described below. Figure 1 and Figure 2 The details of the primary fan blade assembly 200 will be described below.

[0057] As shown in Figure 1 and Figure 2As shown, the first fan blade 210 comprises a plurality of first blades 211, and the first fan blade 210 can drive the plurality of first blades 211 to rotate when the first fan blade 210 rotates, and then the rotation of the first blades 211 can disturb the air to generate air volume to achieve the cooling effect.

[0058] Optionally, the number of the first blades 211 can be five, six, seven, eight, ten or any number, and the operator can selectively set according to the cooling demand. For example, the number of the first blades 211 in the embodiment is ten, which is beneficial to generate stronger air flow when the first fan blade assembly 200 rotates, and is beneficial to improve the cooling effect. Further, the gap between the ten first blades 211 is small, so as to increase the density between the first blades 211, which is beneficial to make the fan produce more gentle wind effect, larger air volume and lower noise.

[0059] Optionally, the first fan blade 210 is formed by a mold, which is beneficial to improve the processing efficiency of the first fan blade 210 and reduce the processing cost of the first fan blade 210. Further, the first fan blade 210 is formed by mold injection.

[0060] The first fan blade assembly 200 further comprises a first mounting frame 220, the first mounting frame 220 is connected with the driving assembly 100, and the first fan blade 210 is connected with the first mounting frame 220. The first mounting frame 220 is used for mounting and fixing the first fan blade 210, so that the rotation of the driving wheel 120 can drive the first mounting frame 220 to rotate, and then drive the first fan blade 210 to rotate.

[0061] The first mounting frame 220 is provided with a through hole, so that the transmission shaft 110 can pass through the first mounting frame 220.

[0062] The first mounting frame 220 is a disc structure, which is beneficial to improve the dynamic balance effect when the first mounting frame 220 drives the first fan blade 210 to rotate.

[0063] Optionally, the first mounting frame 220 comprises a disc-shaped fixed part 221, and the fixed part 221 is connected with the driving wheel 120 through a first fixing part. More specifically, the fixed part 221 is installed on the end face of the driving wheel 120, and the first fixing part passes through the fixed part 221 to connect with the driving wheel 120.

[0064] In addition, the first mounting frame 220 further comprises a disc-shaped mounting part 222, and the mounting part 222 is arranged in parallel with the fixed part 221, and the first fan blade 210 is connected with the mounting part 222 through a second fixing part. More specifically, the first fan blade 210 is connected with the end face of the mounting part 222 which is away from the fixed part 221, which is beneficial to increase the contact area of the first fan blade 210 and the mounting part 222, and is beneficial to improve the structural stability.

[0065] Optionally, the second fixing member is a bolt or a screw, so that the first fan blade 210 and the mounting portion 222 are detachably connected. The bolt and the screw are common fasteners, which are convenient to purchase and have low cost. In the embodiment, the first fan blade 210 and the mounting portion 222 are connected by the bolt, which is beneficial to improve the connection strength and further improve the structural stability.

[0066] Further, the primary mounting frame 220 further comprises a connecting sleeve 223, which is arranged between the fixing portion 221 and the mounting portion 222, so that the distance between the fixing portion 221 and the mounting portion 222 can be adjusted by using the connecting sleeve 223, and further the axial distance between the primary fan blade assembly 200 and the driving wheel 120 is adjusted, so as to adjust the axial size of the fan, so as to expand the application range of the fan.

[0067] Optionally, please continue to refer to Figure 2 The primary fan blade assembly 200 further comprises a primary bearing 230, which is sleeved on the transmission shaft 110, and the primary mounting frame 220 is sleeved on the primary bearing 230. The primary bearing 230 and the driving wheel 120 jointly support the first fan blade 210, which is beneficial to improve the structural stability of the first fan blade 210 and avoid deformation of the first fan blade 210 when the first fan blade 210 rotates at high speed. Meanwhile, the primary bearing 230 makes the first fan blade 210 rotate only under the driving of the driving wheel 120, which is independent of the transmission shaft 110, so as to avoid that the driving wheel 120 and the transmission shaft 110 have different rotating speeds and generate torque on the first fan blade 210, which causes damage, and is beneficial to improve the safety performance of the fan.

[0068] As an optional solution, please refer to Figure 1 and Figure 2 The first fan blade 210 has a windless zone A1, and the fan further comprises a secondary fan blade assembly 300, which is located on the side of the primary fan blade assembly 200 away from the driving assembly 100. The secondary fan blade assembly 300 comprises a second fan blade 310, the diameter of the second fan blade 310 is smaller than that of the first fan blade 210, the rotation of the second fan blade 310 is caused by the blowing of the first fan blade 210 when the first fan blade 210 rotates, and at least part of the windless zone A1 of the first fan blade 210 has wind.

[0069] The diameter of the fan blade refers to twice the distance from the center axis of the fan to the farthest end of the blade. In other words, it is the longest straight line distance through the center of the fan.

[0070] The rotation of the second fan blade 310 of the fan is caused only by the blowing of the first fan blade 210, and is not caused by the transmission shaft 110, so the secondary fan blade assembly 300 does not increase the load of the driving assembly 100, that is, does not increase the power consumption of the fan, which is beneficial to save the energy consumption of the fan, and the secondary fan blade assembly 300 has a simple structure and low cost. At the same time, the first fan blade 210 can blow the second fan blade 210 to rotate, which is beneficial to improve the air volume of the fan.

[0071] The details of the secondary fan blade assembly 300 will be described below. Figures 1-4 The details of the secondary fan blade assembly 300 will be described below.

[0072] The secondary fan blade assembly 300 further comprises a secondary bearing 320, the secondary bearing 320 is sleeved on the transmission shaft 110, and the second fan blade 310 is installed on the transmission shaft 110 through the secondary bearing 320. The secondary fan blade assembly 300 is connected with the transmission shaft 110 through the secondary bearing 320, and when the transmission shaft 110 drives the first fan blade 210 to rotate, the transmission shaft 110 will not directly drive the second fan blade 310 to rotate, so the secondary fan blade assembly 300 will not increase the load of the driving assembly 100, which is beneficial to save the energy consumption of the fan, and the structure of the secondary bearing 320 is simple and the cost is low.

[0073] When the cooling system requires a small air volume, the first fan blade 210 rotates at a low speed, and at this time the second fan blade 310 does not rotate. When the cooling system requires a large air volume, the first fan blade 210 rotates at a high speed, and the air volume generated by the rotation of the first fan blade 210 drives the second fan blade 310 to rotate, so as to supplement the part of the area of the no-wind zone of the first fan blade 210 with the second fan blade 310, so as to reduce the no-wind zone of the whole fan, which is beneficial to improve the air volume of the fan, and further improve the cooling capacity of the cooling system.

[0074] In the embodiment, the no-wind zone is a part of the circular area of the first fan blade with the center of the primary fan blade assembly 200 as the center and a diameter smaller than that of the first fan blade.

[0075] The secondary fan blade assembly 300 does not need special tooling and can be directly installed on the transmission shaft of the existing fan, which is beneficial to reduce the cost. The secondary fan blade assembly 300 is connected with the driving assembly 100 through the bearing, which has a stable structure and is beneficial to improve the reliability of the fan.

[0076] As shown in Figure 1 and Figure 2 As shown in FIGS. 1, 2 and 3, the second fan blade 310 is arranged corresponding to the no-wind zone of the first fan blade 210, so as to supplement the no-wind zone of the primary fan blade assembly 200, and reduce the no-wind zone of the whole fan, which is beneficial to improve the air volume of the fan.

[0077] Meanwhile, the first fan blade 210 and the second fan blade 310 are installed on the transmission shaft 110, and the second fan blade 310 is close to the first fan blade 210 in the axial direction of the transmission shaft 110, so that the first fan blade 210 is more likely to blow the second fan blade 310, and the air volume is improved.

[0078] Further, the diameter of the second fan blade 310 is greater than the diameter of the windless zone of the first fan blade 210, so that the second fan blade 310 at least partially corresponds to the non-windless zone of the first fan blade 210, so that the first fan blade 210 is more likely to blow the second fan blade 310 to rotate, and the purpose of using the second fan blade 310 to make at least part of the windless zone of the first fan blade 210 have wind is achieved.

[0079] The principle of the two-stage fan blade assembly 300 to make at least part of the windless zone of the first-stage fan blade assembly 200 have wind is as follows:

[0080] As shown in Figure 3 , the diameter of the second fan blade 310 is less than the diameter of the first fan blade 210, and the diameter of the second fan blade 310 is greater than the diameter of the windless zone of the first fan blade 210. At this time, the diameter of the windless zone A2 of the second fan blade 310 is less than the diameter of the windless zone A1 of the first-stage fan blade assembly 200. In this embodiment, the windless zone of the first fan blade 210 is set as A1, and the windless zone of the second fan blade 310 is set as A2. The cross-sectional area through which the air of the second fan blade 310 passes coincides with part of the windless zone of the first fan blade 210, thereby increasing the cross-sectional area through which the air of the first-stage fan blade assembly 200 and the two-stage fan blade assembly 300 passes as a whole, thereby increasing the air volume that the fan can generate.

[0081] Optionally, referring to Figure 2 , the second fan blade assembly includes a two-stage mounting frame 330. The two-stage mounting frame 330 is sleeved on the two-stage bearing 310, and the second fan blade 310 is connected with the two-stage mounting frame 330. The two-stage mounting frame 330 is used for mounting and fixing the second fan blade 310, and is conducive to improving the structural stability of the second fan blade 310 when rotating.

[0082] Further, the second fan blade 310 includes a plurality of second blades 311, and the second fan blade 310 can drive the plurality of second blades 311 to rotate when rotating, and then disturb the air through the rotation of the second blades 311 to generate air volume to achieve the effect of cooling.

[0083] Optionally, the number of the second blades 311 can be five, six, seven, eight, ten or any number, which can be selectively set by the operator according to the cooling requirement. For example, the number of the second blades 311 in the embodiment is ten, which is the same as the first blades 211, and the difference between the first blades 211 and the second blades 311 is that the size of the second blades 311 is smaller than that of the first blades 211. The second blades 311 are beneficial to generate stronger airflow when rotating, which is beneficial to improve the cooling effect. Further, the gap between the ten second blades 311 is small, so as to increase the density between the second blades 311, which is beneficial to make the wind generated by the fan more soft, the wind volume larger and the noise lower.

[0084] In summary, the second fan blade 310 is basically the same as the first fan blade 210 in shape, only different in size.

[0085] Optionally, since the mold forming technology of the current first fan blade 210 structure is mature, in order to reduce the processing cost of the second fan blade 310, the second fan blade 310 is formed by mold, which is the same as the first fan blade 210, which is beneficial to improve the processing efficiency of the first body 322 and reduce the processing cost of the second fan blade 310. Further, the second fan blade 310 is formed by mold injection.

[0086] Optionally, the structure of the secondary mounting bracket 321 is the same as that of the primary mounting bracket 220, only the size is smaller than that of the primary mounting bracket 220, which is beneficial to utilize the length of the secondary mounting bracket 321 along the axis of the transmission shaft 110 to increase the distance between the second fan blade 310 and the first fan blade 210, so as to avoid interference.

[0087] Further, as shown in Figure 4 , the second fan blade 310 and the first fan blade 210 are arranged at intervals along the axis of the drive shaft 110, so as to avoid interference.

[0088] As an optional solution, please refer to Figure 2 , the fan further comprises a tertiary mounting bracket 400 and a tertiary bearing 500, the tertiary bearing 500 is embedded in the tertiary mounting bracket 400, and the transmission shaft 110 of the drive assembly 100 penetrates the tertiary bearing 500. The tertiary mounting bracket 400 and the tertiary bearing 500 are used to fix the primary fan blade assembly 200 and the secondary fan blade assembly 300, so as to improve the structural stability of the fan. At the same time, the tertiary bearing 500 is arranged between the tertiary mounting bracket 400 and the transmission shaft 110, which can not only make the tertiary bearing 500 have a supporting effect on the transmission shaft 110, so as to improve the structural stability of the transmission shaft 110, but also is beneficial to avoid wear between the transmission shaft 110 and the tertiary mounting bracket 400 when the transmission shaft 110 rotates, so as to improve the service life of the transmission shaft 110.

[0089] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "longitudinal", "radial", "circumferential" is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0090] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0091] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0092] In the utility model, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0093] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that the specific feature, structure, material or characteristic being described with reference to the embodiment or example is included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the features of different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0094] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and the changes, modifications, replacements and modifications of the above embodiments made by the person skilled in the art are within the protection scope of the present application.

Claims

1. A fan, characterized by, The fan comprises: a driving assembly (100) having a transmission shaft (110); a primary fan blade assembly (200) comprising a first fan blade (210) and connected with the driving assembly (100), the driving assembly (100) being used to drive the first fan blade (210) to rotate, the first fan blade (210) having a windless zone; and a secondary fan blade assembly (300) located on a side of the primary fan blade assembly (200) away from the driving assembly (100), the secondary fan blade assembly (300) comprising a second fan blade (310); the second fan blade (310) having a diameter smaller than that of the first fan blade (210), the second fan blade (310) being caused to rotate by blowing of the first fan blade (210) when rotating, and making at least part of the windless zone of the first fan blade (210) have wind.

2. The fan of claim 1, wherein, The secondary fan blade assembly (300) further comprises a secondary bearing (320) sleeved on the transmission shaft (110), and the second fan blade (310) is installed on the transmission shaft (110) through the secondary bearing (320).

3. The fan of claim 1, wherein, The first fan blade (210) and the second fan blade (310) are installed on the transmission shaft (110), and the second fan blade (310) is close to the first fan blade (210) in the axial direction of the transmission shaft (110).

4. The fan of claim 2, wherein, The secondary fan blade assembly (300) further comprises: a secondary mounting frame (330) sleeved on the secondary bearing (320); and the second fan blade (310) is connected with the secondary mounting frame (330).

5. The fan of claim 1, wherein, The diameter of the second fan blade (310) is greater than that of the windless zone of the first fan blade (210).

6. The fan of claim 1, wherein, The primary fan blade assembly (200) further comprises: a primary mounting frame (220) connected with the driving assembly (100); and the first fan blade (210) is connected with the primary mounting frame (220).

7. The fan of claim 6, wherein, The driving assembly (100) further comprises: a driving wheel (120) connected with the primary mounting frame (220) through bolts.

8. The fan of claim 7, wherein, The transmission shaft (110) is arranged in the driving wheel (120), and the transmission shaft (110) is in interference fit with the driving wheel (120).

9. The fan of claim 7, wherein, The primary fan blade assembly (200) further comprises: a primary bearing (230) sleeved on the transmission shaft (110), and the primary mounting frame (220) is sleeved on the primary bearing (230).

10. The fan of any of claims 1-9, wherein, The fan further comprises: a tertiary mounting frame (400); and a tertiary bearing (500) embedded in the tertiary mounting frame (400), and one end of the transmission shaft (110) is arranged in the tertiary bearing (500).

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