Fan blade assembly and air outlet device

Abstract

The application relates to a fan blade assembly and an air outlet device, the fan blade assembly comprising: a motor, comprising a motor body and a motor shaft extending from one side of the motor body, the motor shaft comprising a first connecting section close to the motor body and a second connecting section away from the motor body; a shaft sleeve sleeved outside the first connecting section; and a fan blade body sleeved outside the shaft sleeve; wherein the shaft sleeve comprises a first fitting section and a second fitting section, the first fitting section is transitionally fitted with one end of the first connecting section close to the motor body, and the second fitting section is interference-fitted with one end of the first connecting section away from the motor body. The fan blade assembly can effectively reduce the gap between the shaft sleeve and the motor shaft by interference-fitting the second fitting section with one end of the first connecting section away from the motor body, thereby ensuring the coaxiality of the fan blade body and the motor shaft, and reducing the shaking of the fan blade body. Meanwhile, the first fitting section is transitionally fitted with one end of the first connecting section close to the motor body, so that the user can easily disassemble and assemble.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air outlet equipment, in particular to a fan blade assembly and air outlet equipment. BACKGROUND

[0002] As a kind of household appliance, electric fan is driven by motor to rotate fan blade, to achieve air acceleration flow, which can effectively promote air flow and reduce people's body temperature, widely used in people's living and working environment, effectively improve people's life quality.

[0003] However, the existing electric fan products, such as ordinary floor fan, direct current floor fan, table fan and square fan, have the problem of fan blade shaking at a certain speed. The existing electric fan often adopts the method of not setting gear in the shaking range to avoid shaking speed, but at the same time, it will lead to too large speed span between gears, which affects user experience.

[0004] Moreover, in order to facilitate the disassembly and assembly of fan blade, the existing fan blade and motor shaft have large matching gap, which will inevitably lead to assembly eccentricity problem, resulting in increased unbalanced mass, finally causing serious shaking of electric fan head, affecting the use experience of electric fan. SUMMARY

[0005] Therefore, it is necessary to provide a fan blade assembly and air outlet equipment to effectively avoid the problem of fan blade shaking during use of electric fan.

[0006] According to one aspect of the present application, a fan blade assembly is provided, comprising:

[0007] A motor comprising a motor body and a motor shaft extending from one side of the motor body, the motor shaft comprising a first connecting section close to the motor body and a second connecting section away from the motor body;

[0008] A shaft sleeve sleeved outside the first connecting section;

[0009] A fan blade body sleeved outside the shaft sleeve;

[0010] The shaft sleeve comprises a first fitting section and a second fitting section, the first fitting section is transitionally fitted with one end of the first connecting section close to the motor body, and the second fitting section is interference fitted with one end of the first connecting section away from the motor body.

[0011] In one embodiment, the length of the second fitting section is 1 / 3 to 1 / 2 of the total length of the shaft sleeve.

[0012] In one of the embodiments, the difference between the inner diameter of the second fitting section and the outer diameter of the motor shaft is greater than 0 and less than 0.4 mm.

[0013] In one of the embodiments, the inner diameter of the first fitting section is equal to the outer diameter of the motor shaft.

[0014] In one of the embodiments, the fan blade assembly further comprises a knob, the knob is threadedly connected to the second connecting section, and the knob is used to apply a pressing force to the fan blade body towards the motor body in the axial direction of the motor shaft.

[0015] In one of the embodiments, there is an installation gap between the knob and the shaft sleeve.

[0016] In one of the embodiments, the installation gap is greater than 0 and less than 2 mm.

[0017] In one of the embodiments, the outer diameter of the first connecting section is greater than the outer diameter of the second connecting section, and the knob abuts against an end face of the end of the first connecting section connecting the second connecting section.

[0018] In one of the embodiments, the fan blade body is provided with an installation groove surrounding the motor shaft, and the fan blade assembly further comprises an elastic member capable of resiliently deforming under an external force, the elastic member is installed in the installation groove, and an end face of the knob towards the motor body abuts against the elastic member.

[0019] According to another aspect of the present application, there is provided an air outlet device comprising the above-mentioned fan blade assembly.

[0020] The above-mentioned fan blade assembly, through the interference fit of the second fitting section and the end of the first connecting section away from the motor body, can effectively reduce the gap between the shaft sleeve and the motor shaft, ensure the coaxiality of the fan blade body and the motor shaft, and thus reduce the shaking of the fan blade body. At the same time, since the first fitting section and the end of the first connecting section close to the motor body are transitionally fitted, the user can easily disassemble and assemble. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a partially exploded schematic view of a handpiece according to an embodiment of the present application;

[0022] Figure 2 is Figure 1 is a longitudinal sectional view of an air outlet assembly of the handpiece shown;

[0023] Figure 3 is Figure 2 is a partially structural schematic view of the air outlet assembly shown;

[0024] Figure 4 is Figure 1Structure diagram of the motor of the shown air assembly;

[0025] Figure 5 For Figure 1 Structure diagram of the shaft sleeve of the shown air assembly;

[0026] Figure 6 For Figure 1 Assembly diagram of the shaft sleeve and the motor shaft of the shown air assembly;

[0027] Figure 7 For Figure 2 The shown air assembly is shown in the enlarged view of A.

[0028] Brief Description of the Drawings:

[0029] 100, head; 120, rear net of fan blade; 140, front net of fan blade; 160, fan blade assembly; 161, motor; 1612, motor body; 1614, motor shaft; 1614a, extension section; 1614b, abutting section; 1614c, first connecting section; 1614d, second connecting section; 163, shaft sleeve; 1632, first matching section; 1634, second matching section; 167, knob; 1672, knob body; 1674, knob mounting portion; 165, fan blade body; 1652, mounting groove; 169, elastic member. DETAILED DESCRIPTION

[0030] In order to make the above objectives, characteristics and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by persons skilled in the art without departing from the scope of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] In addition, the terms "first", "second", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered sequence. Thus, use of "first" and "second" designations in this description should not be understood as implying that a single feature is limited to at least one occurrence.

[0033] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixing" and the like are to be construed as broadly as possible, for example, they can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless specifically defined otherwise, the first feature is "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", "over" and "on" 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", "under" and "under" 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.

[0035] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0036] As described in the background, the existing electric fan includes a head mounted with a motor shaft and a fan blade, and the fan blade is matched with the motor shaft through a shaft hole. Through actual measurement, the maximum amplitude of the head of the existing air outlet device is 1.6mm-2.0mm, and the rotational speed interval of the shaking is 120rpm-150rpm. The inventor found that the shaking problem of the head is a mechanical vibration problem in principle, and since the overall structure of the air outlet device is relatively complex, it can be simplified as a forced (simple harmonic disturbance force) vibration system for analysis.

[0037] From the vibration, the formula for calculating the amplitude B of single degree of freedom forced (harmonic disturbance force) vibration is:

[0038]

[0039] Wherein, H is the amplitude of the harmonic disturbance force; m is the equivalent mass; ω is the natural frequency of the system; p is the disturbance force circular frequency (the same as the rotating circular frequency); c is the equivalent resistance system; since the equivalent resistance system c of the air outlet device is generally small, the formula for calculating the amplitude B of single degree of freedom forced (harmonic disturbance force) vibration can be simplified as:

[0040]

[0041] From the above formula, it can be seen that the amplitude of the head is proportional to the amplitude of the harmonic disturbance force, and the amplitude of the harmonic disturbance force is related to the unbalanced mass of the rotating parts in the head. The greater the unbalanced mass, the greater the amplitude of the harmonic disturbance force when the fan blade rotates, and thus the greater the shaking of the head. It can also be seen that if the rotating circular frequency of the fan blade is very close to its natural frequency, the denominator in the above formula is very small, and even if the amplitude of the harmonic disturbance force is not large, the head will also have a large amplitude.

[0042] In the prior art, due to the existence of machining errors, the maximum fitting gap between the motor shaft and the fan blade shaft hole is 0.05mm within the error allowable range. Due to the existence of the fitting gap between the motor shaft and the fan blade shaft hole, the problem of eccentricity of the fan blade and the motor shaft is prone to occur. The eccentricity of the fan blade and the motor shaft will increase the unbalanced mass of the rotating fan blade (i.e. the disturbance force increases), and the increase of the disturbance force will cause the fan blade to shake severely in the resonance range, affecting the stability of the head operation.

[0043] In view of the problem of the unbalanced mass of the fan blade increasing due to the eccentricity of the fan blade shaft hole and the motor shaft, if the conventional method in the field is used, the assembly gap is reduced by improving the machining precision, although the shaking of the fan blade can be effectively reduced, the production and processing cost is also increased, and the user is also difficult to disassemble and assemble the fan blade, which is not conducive to the storage and cleaning of the air outlet device.

[0044] Referring to Figure 1 , Figure 1 Fig. 1 shows a partial exploded view of the head 100 in an embodiment of the present application. In order to avoid the eccentricity of the fan blade relative to the motor shaft and prevent the shaking of the fan blade while facilitating the disassembly and assembly of the fan blade and the motor shaft, the present application provides an air outlet device.

[0045] The air outlet device includes a body (not shown in the figure) and a head 100, the head 100 is installed on the body for outputting air flow. The head 100 includes a fan blade rear net 120, a fan blade front net 140 and a fan blade assembly 160, the fan blade rear net 120 and the fan blade front net 140 are arranged in a clasp to define a containing cavity, the fan blade rear net 120 and the fan blade front net 140 are in a grid structure, thereby forming a plurality of air flow channels which are in communication with the containing cavity and the external environment. The fan blade assembly 160 is contained in the containing cavity formed by the fan blade rear net 120 and the fan blade front net 140. In this way, the negative pressure generated by the fan blade assembly 160 causes the air in the external environment to flow into the containing cavity from the fan blade rear net 120 and then flow out from the fan blade front net 140. It can be understood that the specific structure of the body and the head 100 does not belong to the main point of the present application, and therefore will not be described here.

[0046] The structure of the fan blade assembly 160 of the present application will be described below taking the air outlet device as an example, which is an electric fan. The present embodiment is only used as an example for illustration and will not limit the technical scope of the present application. It can be understood that in other embodiments, the air outlet device can also be other appliances installed with the fan blade assembly 160, which is not limited herein.

[0047] In combination with Figure 2 and Figure 3 shown, Figure 2 a longitudinal sectional view of the air outlet assembly in an embodiment of the present application is shown, Figure 3 a partial longitudinal sectional view of the air outlet assembly in an embodiment of the present application is shown.

[0048] In some embodiments, the fan blade assembly 160 includes a motor 161, a shaft sleeve 163, a fan blade body 165 and a knob 167. The motor 161 includes a motor body 1612 and a cylindrical motor shaft 1614 extending from one side of the motor body 1612, the motor body 1612 can drive the motor shaft 1614 to rotate around its central axis. The shaft sleeve 163 is axially sleeved on the end of the motor shaft 1614 close to the motor body 1612 and can synchronously rotate with the motor shaft 1614, the fan blade body 165 is axially sleeved on the shaft sleeve 163, the fan blade body 165 is in interference fit with the shaft sleeve 163 to synchronously rotate with the shaft sleeve 163. The knob 167 is sleeved on the end of the motor shaft 1614 away from the motor body 1612, the knob 167 is used to apply a pressing force to the fan blade body 165 in the axial direction of the motor shaft 1614 towards the motor body 1612, thereby limiting the displacement of the fan blade body 165 in the axial direction of the motor shaft 1614.

[0049] Thus, the fan blade body 165 is sleeved on the motor shaft 1614 through the shaft sleeve 163 and is fastened on the motor shaft 1614 through the knob 167, the motor shaft 1614 rotates around its central axis under the driving of the motor body 1612, and then drives the fan blade body 165 to rotate around the rotation center of the motor shaft 1614 through the shaft sleeve 163.

[0050] Specifically, as shown in Figure 4 , Figure 4 The structure diagram of the motor in an embodiment of the application is shown. The motor shaft 1614 includes an extension segment 1614a, an abutting segment 1614b, a first connecting segment 1614c and a second connecting segment 1614d arranged along the axial direction in sequence. The extension segment 1614a is connected to the motor body 1612 at one end, the abutting segment 1614b is connected to the end of the extension segment 1614a away from the motor body 1612, the first connecting segment 1614c is connected to the end of the abutting segment 1614b away from the extension segment 1614a, and the second connecting segment 1614d is connected to the end of the first abutting segment 1614b away from the abutting segment 1614b. The outer diameter of the abutting segment 1614b is larger than that of the first connecting segment 1614c, so that the end of the abutting segment 1614b connected to the first connecting segment 1614c forms an abutting surface surrounding the first connecting segment 1614c. The outer diameter of the first connecting segment 1614c is larger than that of the second connecting segment 1614d, so that the end surface of the first connecting segment 1614c connected to the second connecting segment 1614d forms a limiting surface surrounding the second connecting segment 1614d.

[0051] Further, the outer surface of the first connecting segment 1614c is smooth and extends uniformly, and the outer diameter of the first connecting segment 1614c is equal everywhere to match the shaft sleeve 163. The outer surface of the second connecting segment 1614d is provided with external threads to match the knob 167.

[0052] As shown in Figure 5 and Figure 6 , Figure 5 The structure diagram of the shaft sleeve in an embodiment of the application is shown, Figure 6 The assembly diagram of the shaft sleeve and the motor shaft in an embodiment of the application is shown.

[0053] The shaft sleeve 163 has a hollow cylindrical structure, and is sleeved on the first connecting section 1614c of the motor shaft 1614 and abuts against the abutting surface of the abutting section 1614b in the axial direction. The shaft sleeve 163 comprises a first fitting section 1632 and a second fitting section 1634 connected to each other in the axial direction. The outer diameter of the first fitting section 1632 is the same as that of the second fitting section 1634, the inner diameter d1 of the first fitting section 1632 is greater than the inner diameter d2 of the second fitting section 1634, and the inner diameter d1 of the first fitting section 1632 is the same as the outer diameter D of the first connecting section 1614c of the motor shaft 1614, and the inner diameter d2 of the second fitting section 1634 is smaller than the outer diameter D of the first fitting section 1632. When the shaft sleeve 163 is sleeved on the first connecting section 1614c of the motor shaft 1614, the first fitting section 1632 is transitionally fitted with the end of the first connecting section 1614c close to the motor body 1612, and the second fitting section 1634 is interference-fitted with the end of the first connecting section 1614c away from the motor body 1612.

[0054] In this way, the shaft sleeve 163 abuts against the abutting surface of the abutting section 1614b, a part of the shaft sleeve 163 is interference-fitted with the motor shaft 1614, and another part of the shaft sleeve 163 is transitionally fitted with the motor shaft 1614, so that the shaft sleeve 163 and the motor shaft 1614 can be disassembled while reducing the shaking of the blade body 165. Specifically, by interference-fitting the second fitting section 1634 with the end of the first connecting section 1614c away from the motor body 1612, the gap between the shaft sleeve 163 and the motor shaft 1614 can be effectively reduced, and the coaxiality of the two can be ensured, thereby significantly reducing the shaking of the blade body 165. At the same time, since the first fitting section 1632 is transitionally fitted with the end of the first connecting section 1614c close to the motor body 1612, the user can easily disassemble the shaft sleeve 163 and the motor shaft 1614.

[0055] Moreover, since the first connecting section 1614c is located at the end of the motor shaft 1614 close to the motor body 1612, and the second connecting section 1614d is located at the end of the motor shaft 1614 away from the motor body 1612, in the process of inserting the shaft sleeve 163 into the motor shaft 1614, the second connecting section 1614d first extends into the first fitting section 1632 of the shaft sleeve 163. Since the inner diameter d1 of the first fitting section 1632 is the same as the outer diameter D of the first connecting section 1614c, the second connecting section 1614d can be easily extended into the first fitting section 1632, thereby improving the convenience of assembly.

[0056] Specifically, in some embodiments, the length l of the second fitting section 1634 is 1 / 3 to 1 / 2 of the total length L of the shaft sleeve 163, preferably 1 / 3, so as to achieve close fitting of the shaft sleeve 163 and the motor shaft 1614 while enabling easy assembly and disassembly of the shaft sleeve 163 and the motor shaft 1614. Conversely, if the length l of the second fitting section 1634 is less than 1 / 3 of the total length L of the shaft sleeve 163, the shaft sleeve 163 and the motor shaft 1614 cannot be sufficiently fastened, and the fan blade body 165 will still vibrate significantly. If the length l of the second fitting section 1634 is greater than 1 / 2 of the total length L of the shaft sleeve 163, the shaft sleeve 163 and the motor shaft 1614 will be too tightly fitted and difficult to disassemble.

[0057] It can be understood that the ratio of the length l of the first fitting section 1632 to the total length L of the shaft sleeve 163 is not limited thereto and can be adjusted as needed to ensure that the shaft sleeve 163 and the motor shaft 1614 are sufficiently fastened while not affecting the assembly and disassembly of the two.

[0058] In some embodiments, the difference between the inner diameter d2 of the second fitting section 1634 and the outer diameter D of the first connecting section 1614c is greater than 0 and less than 0.4 mm, so as to meet the interference fitting requirement of the first fitting section 1632 and the first connecting section 1614c. Conversely, if the difference between the inner diameter d2 of the second fitting section 1634 and the outer diameter D of the first connecting section 1614c is equal to 0 or the inner diameter d2 of the second fitting section 1634 is greater than the outer diameter D of the first connecting section 1614c, the interference fitting cannot be achieved. If the difference between the inner diameter d2 of the second fitting section 1634 and the outer diameter D of the first connecting section 1614c is too large, the assembly of the shaft sleeve 163 and the motor shaft 1614 will be too difficult.

[0059] Please refer again to Figure 3 The knob 167 includes a knob body 1672 and a knob mounting portion 1674. The knob body 1672 is in the shape of a rotation body formed by injection molding. The knob mounting portion 1674 is formed of a metal material and is embedded in the knob body 1672 to form a knob mounting hole having internal threads, and the shape of the knob mounting hole matches that of the second connecting section 1614d. In this way, the knob 167 is threadedly connected to the second connecting section 1614d through the knob mounting hole, and one end of the knob 167 facing the fan blade body 165 exerts a pressing force on the fan blade body 165 to press the fan blade body 165 against the motor 161. It can be understood that the structure of the knob 167 is not limited thereto and can be set as needed to meet different requirements.

[0060] In combination with Figure 7 , it is shown that Figure 7 is shown Figure 2The local enlarged view of the middle A. In some embodiments, the axial length of the first connecting section 1614c of the motor shaft 1614 is greater than the total length L of the sleeve 163, so that the limiting surface of the first connecting section 1614c protrudes out of the sleeve 163, and thus the knob 167 sleeved on the motor shaft 1614 is resisted between the limiting surface of the first connecting section 1614c and the end surface of the sleeve 163, so that there is an installation gap d3 between the knob 167 and the end surface of the sleeve 163, thereby preventing the knob 167 from directly pressing the sleeve 163 during the tightening process to cause the impeller body 165 to be eccentric, ensuring the dynamic balance of the impeller body 165 during assembly to prevent the impeller body 165 from shaking. The installation gap d3 is greater than 0 and less than 2 mm, and is preferably 0.5-1 mm. It can be understood that the size of the installation gap d3 is not limited thereto, and can be set according to actual conditions.

[0061] In some embodiments, the side surface of the impeller body 165 towards the knob 167 is provided with a mounting groove 1652 extending in a ring shape around the motor shaft 1614. The impeller assembly 160 further comprises an elastic member 169 formed of rubber or the like material capable of resiliently deforming under external force. The elastic member 169 is in a ring shape matching the shape of the mounting groove 1652.

[0062] In this way, the elastic member 169 can be mounted in the mounting groove 1652, and the end surface of the knob 167 towards the motor body 1612 is resisted against the elastic member 169 to elastically contact the impeller body 165, thereby reducing the extrusion of the impeller body 165 caused by the knob 167 during tightening, avoiding the misalignment of the impeller body 165 and the motor shaft 1614, and finally effectively preventing the impeller body 165 and the handpiece 100 from shaking.

[0063] As a preferred embodiment, the cross section of the elastic member 169 is in a "T" shape, comprising a large end and a small end arranged in the axial direction to facilitate the installation of the elastic member 169. When the elastic member 169 is limited in the mounting groove 1652, the small end of the elastic member 169 is first embedded in the mounting groove 1652 to facilitate the installation of the elastic member 169, and the large end of the elastic member 169 protrudes out of the mounting groove 1652 away from the side of the small end to resist the impeller body 165. It can be understood that the specific shape of the elastic member 169 is not limited, and can be set as needed to meet different requirements.

[0064] The fan blade assembly 100 and the air outlet device provided with the same have the following advantages: the part of the shaft sleeve 163 is transitionally matched with the motor shaft 1614, the part of the shaft sleeve 163 is connected with the motor shaft 1614 in a manner of interference fit, the gap between the shaft sleeve 163 and the motor shaft 1614 is effectively reduced, the coaxiality of the fan blade body 165 and the motor shaft 1614 is ensured, the shaking of the fan blade body 165 in the working process is significantly reduced, the shaft sleeve 163 and the motor shaft 1614 can be easily disassembled, the storage and cleaning of the air outlet device are facilitated, the knob 167 is in elastic contact with the fan blade body 165 and a gap is kept between the knob 167 and the shaft sleeve 163, the problem that the fan blade body 165 and the motor shaft 1614 are out of alignment due to the extrusion of the fan blade body 165 and the shaft sleeve 163 when the knob 167 is tightened is effectively prevented, the shaking of the fan blade body 165 and the motor shaft 1614 is further prevented, and the use experience of the air outlet device is improved, without the need to increase the production cost of the air outlet device.

[0065] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered within the scope of the present disclosure.

[0066] The above-described embodiments only express several implementation manners of the present disclosure, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the present disclosure, a number of modifications and improvements can be made, which are within the scope of the present disclosure. Therefore, the scope of protection of the patent of the present disclosure should be subject to the appended claims.

Claims

1. A fan blade assembly, characterized in that, include: The motor (161) includes a motor body (1612) and a motor shaft (1614) extending out of one side of the motor body (1612). The motor shaft (1614) includes a first connecting section (1614c) near the motor body (1612) and a second connecting section (1614d) away from the motor body (1612). A bushing (163) is fitted over the first connecting section (1614c); The fan blade body (165) is sleeved on the outside of the bushing (163), and the fan blade body (165) has a mounting groove (1652) surrounding the motor shaft (1614); A knob (167) is threaded to the second connecting section (1614d). The knob (167) is used to apply a clamping force toward the motor body (1612) to the fan blade body (165) in the axial direction of the motor shaft (1614), and there is an installation gap between the knob (167) and the bushing (163). An elastic element (169) is installed in the mounting groove (1652). The elastic element (169) can undergo recoverable deformation under external force. The end face of the knob (167) facing the motor body (1612) abuts against the elastic element (169). The bushing (163) includes a first mating section (1632) and a second mating section (1634). The first mating section (1632) is transitionally mated to the end of the first connecting section (1614c) near the motor body (1612), and the second mating section (1634) is interference-fitted to the end of the first connecting section (1614c) away from the motor body (1612).

2. The fan blade assembly according to claim 1, characterized in that, The length of the second mating section (1634) is 1 / 3 to 1 / 2 of the total length of the bushing (163).

3. The fan blade assembly according to claim 1 or 2, characterized in that, The difference between the inner diameter of the second mating section (1634) and the outer diameter of the motor shaft (1614) is greater than 0 and less than 0.4 mm.

4. The fan blade assembly according to claim 1, characterized in that, The inner diameter of the first mating section (1632) is equal to the outer diameter of the motor shaft (1614).

5. The fan blade assembly according to claim 1, characterized in that, The installation gap is greater than 0 and less than 2 mm.

6. The fan blade assembly according to claim 5, characterized in that, The outer diameter of the first connecting segment (1614c) is larger than the outer diameter of the second connecting segment (1614d), and the knob (167) abuts against the end face of the first connecting segment (1614c) connecting the second connecting segment (1614d).

7. An air outlet device, characterized in that, Includes the fan blade assembly as described in any one of claims 1 to 6.

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