Air duct assembly, air supply device and air supply equipment

Abstract

The invention relates to an air duct assembly, an air supply device and air supply equipment, and the air duct assembly comprises an air duct shell, first limiting parts are arranged at the two opposite ends in the axial direction correspondingly; the two supports are connected to the two opposite ends of the air duct shell in the axial direction in a matched mode respectively, and each support is limited to the second limiting part of the corresponding first limiting part. The air duct shell can rotate relative to the support, and the first limiting part and the second limiting part can slide relative to each other. According to the air duct assembly, the air duct shell is rotatably installed between the two supports through relative sliding of the first limiting part and the second limiting part, the first limiting part and the second limiting part are arranged at the two opposite ends of the air duct shell in the axial direction respectively, and loads of the air duct shell are distributed at the two opposite ends of the air duct shell in the axial direction; therefore, the load at the position of the central shaft is obviously reduced, stress concentration at the position of the central shaft is weakened, the head shaking process of the air supply device with the air duct assembly is more stable, and the service life of the air supply device is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of cooling equipment, and in particular to an air duct assembly, an air supply device and air supply equipment. Background Art

[0002] With the development of science and technology and the improvement of living standards, people's requirements for the comfort of living environment are gradually increasing. Electric fans use motors to drive the blades to rotate to accelerate the circulation of air. They have the functions of cooling down and circulating air. They are widely used in people's production and life, effectively improving people's living and working environment.

[0003] An electric fan usually includes a main body and a head installed on the main body. The heads of some electric fans are connected to the main body through a central axis. The heads can rotate around the central axis to realize a shaking head function, thereby effectively expanding the air supply range of the electric fan and improving the user experience of the electric fan.

[0004] However, in the existing electric fan, all loads are basically concentrated on the central axis during the shaking process, which leads to stress concentration and strain increase at the central axis, thereby causing the electric fan to run unsteadily and even reducing the service life of the electric fan. Summary of the invention

[0005] In order to solve the problem that stress of an electric fan is concentrated at the central axis during its shaking process, the present application provides an air duct assembly, an air supply device and an air supply equipment.

[0006] According to one aspect of the present application, there is provided an air duct assembly, comprising:

[0007] The air duct housing is provided with first limiting portions at two opposite ends in the axial direction; and

[0008] Two brackets are respectively matched to the two opposite ends of the air duct housing in the axial direction, and each of the brackets is provided with a second limiting portion limited to the first limiting portion;

[0009] Wherein, the air duct housing can rotate relative to the bracket, and the first limiting portion and the second limiting portion can slide relative to each other.

[0010] In one embodiment, the first limiting portion and the second limiting portion are matched with each other in a concave-convex manner.

[0011] In one embodiment, one of the first limiting portion and the second limiting portion is a groove, and the groove extends along the circumference of the air duct housing or the bracket where it is located, and the other of the first limiting portion and the second limiting portion is a boss limited in the groove, and the boss extends along the circumference of the air duct housing or the bracket where it is located.

[0012] In one embodiment, one of the first limiting portion and the second limiting portion is in the shape of an arc with a central angle of 250°-270°, and the other of the first limiting portion and the second limiting portion is in the shape of an arc with a central angle of 90°-120°.

[0013] In one embodiment, the cross section of the groove perpendicular to the circumference of the air duct housing or the bracket where it is located is rectangular, and the cross section of the boss perpendicular to the circumference of the air duct housing or the bracket where it is located is rectangular.

[0014] In one embodiment, the air duct housing includes two air duct end walls and an air duct side wall, the two air duct end walls are spaced apart in the axial direction of the air duct housing, the air duct side wall is located between the two air duct end walls and circumferentially surrounds the edges of the two air duct end walls;

[0015] The two first limiting portions are respectively arranged on two opposite sides of the air duct side wall in the axial direction of the air duct housing.

[0016] In one embodiment, each of the brackets includes a bracket end wall and a bracket side wall circumferentially surrounding the bracket end wall, and the second limiting portion is disposed on a side edge of the bracket side wall close to the air duct housing.

[0017] According to another aspect of the present application, an air supply device is provided, comprising the above-mentioned air duct assembly, the air supply device also comprising an oscillating drive unit, the oscillating drive unit is transmission-connected to the air duct shell, the oscillating drive unit is used to drive the air duct shell to rotate relative to the bracket.

[0018] In one of the embodiments, the air duct housing of the air duct assembly is provided with a transmission rack extending in a circumferential direction, and the oscillating drive unit is engaged with the transmission rack to be transmission-connected with the air duct housing.

[0019] In one of the embodiments, the transmission rack is arranged on the outer periphery of the air duct housing, and in the axial direction of the air duct housing, the transmission rack is located between the two first limiting portions.

[0020] According to another aspect of the present application, an air supply device is provided, comprising the above-mentioned air supply device.

[0021] In the above-mentioned air duct assembly, the air duct shell is rotatably installed between the two brackets through the relative sliding of the first limiting portion and the second limiting portion. Since the first limiting portion and the second limiting portion are respectively arranged at the opposite ends of the axial direction of the air duct shell, the load of the air duct assembly in the prior art is concentrated on the central axis of the connection between the air duct assembly and the main body. The load of the air duct shell in the present application is distributed at the opposite ends of the axial direction of the air duct shell, thereby significantly reducing the load at the central axis and weakening the stress concentration at the central axis, so that the shaking process of the air supply device equipped with the air duct assembly is smoother, and the service life of the air supply device is effectively extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic structural diagram of an air supply device according to an embodiment of the present application.

[0023] FIG. 2 is a schematic structural diagram of an air supply device according to an embodiment of the present application.

[0024] FIG. 3 is a schematic structural diagram of the air supply device shown in FIG. 2 from another angle.

[0025] FIG. 4 is a longitudinal sectional view of the air supply device shown in FIG. 2 .

[0026] FIG. 5 is a partial enlarged schematic diagram of point A shown in FIG. 4 .

[0027] FIG. 6 is a schematic structural diagram of a portion of an air duct housing according to an embodiment of the present application.

[0028] FIG. 7 is a schematic structural diagram of the partial air duct housing shown in FIG. 6 from another angle.

[0029] FIG. 8 is a front view of the partial air duct housing shown in FIG. 6 .

[0030] FIG. 9 is a schematic structural diagram of a bracket according to an embodiment of the present application.

[0031] FIG. 10 is a front view of the bracket shown in FIG. 9 .

[0032] Description of Figure Numbers:

[0033] 100, air supply equipment; 20, base; 40, main body; 60, air supply device; 61, air duct assembly; 612, air duct housing; 6121, air duct end wall; 6121a, air duct air inlet; 6123, air duct side wall; 6123a, air duct air outlet; 6123b, first limiting portion; 6123c, transmission rack; 614, bracket; 6141, bracket end wall; 6143, bracket side wall; 6143a, second limiting portion; 63, wind wheel; 65, shaking head drive unit; 652, shaking head drive member; 654, transmission wheel. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not 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" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean 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, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0040] Referring to FIG. 1 , FIG. 1 shows a schematic structural diagram of an air supply device in an embodiment of the present application. The embodiment of the present application provides an air supply device 100 , including a base 20 , a main body 40 , and an air supply device 60 .

[0041] The base 20 is in the shape of a flat cylinder, etc. The base 20 can be placed on the ground, a desktop or other placement surface to play a supporting and fixing role. The main body 40 is generally a vertically extending cylindrical structure, and the main body 40 is installed on the base 20 to play a supporting, connecting and accommodating role. The air supply device 60 is generally a cylindrical structure, and the air supply device 60 is installed on the top of the main body 40 away from the base 20 through the central axis to form a directional airflow to achieve a cooling effect. It can be understood that the overall structure of the air supply device 100 is not limited to this, and can be set as needed to meet different cooling requirements.

[0042] In combination with Figures 2, 3 and 4, Figure 2 shows a schematic structural diagram of the air supply device in an embodiment of the present application, Figure 3 shows a schematic structural diagram of the air supply device in an embodiment of the present application from another angle, and Figure 4 shows a longitudinal sectional view of the air supply device in an embodiment of the present application.

[0043] In some embodiments, the air supply device 60 includes an air duct assembly 61 , a wind wheel 63 and an oscillating drive unit 65 .

[0044] The air duct assembly 61 can be directly or indirectly connected to the main body 40, and the wind wheel 63 is disposed in the air duct assembly 61. The wind wheel 63 rotates in the air duct assembly 61 to form a negative pressure to generate an outlet air flow. The shaking drive unit 65 can be directly or indirectly connected to the main body 40 and is in transmission connection with the air duct assembly 61. The shaking drive unit 65 can drive at least part of the structure of the air duct assembly 61 to rotate, thereby realizing the up and down shaking function to change the outlet air direction of the air supply device 60.

[0045] Please refer to FIG. 4 and FIG. 5 . FIG. 4 shows a longitudinal cross-sectional view of an air supply device according to an embodiment of the present application, and FIG. 5 shows a partial enlarged schematic diagram of A of the air supply device shown in FIG. 4 .

[0046] The air duct assembly 61 includes an air duct housing 612 and two brackets 614. The air duct housing 612 is provided with first limiting portions 6123b at opposite ends in the axial direction, and the two brackets 614 are respectively matched with opposite ends in the axial direction of the air duct housing 612, and each bracket 614 is provided with a second limiting portion 6143a limited to the first limiting portion 6123b. The air duct housing 612 can rotate relative to the bracket 614 under the drive of the oscillating drive unit 65, and the first limiting portion 6123b and the second limiting portion 6143a slide relative to each other.

[0047] In this way, the air duct shell 612 is rotatably installed between the two brackets 614 through the relative sliding of the first limiting portion 6123b and the second limiting portion 6143a. Since the first limiting portion 6123b and the second limiting portion 6143a are respectively arranged at the opposite ends of the axial direction of the air duct shell 612, the load of the air duct assembly 61 in the prior art is concentrated on the central axis of the connection between the air duct assembly 61 and the main body 40. The load of the air duct shell 612 in the present application is distributed at the opposite ends of the axial direction of the air duct shell 612, thereby significantly reducing the load at the central axis and weakening the stress concentration at the central axis, so that the shaking process of the air supply device 60 equipped with the air duct assembly 61 is smoother, thereby effectively extending the service life of the air supply device 60.

[0048] Specifically, in the following embodiments, the first limiting portion 6123b and the second limiting portion 6143a are matched in a concave-convex manner. Therefore, during the rotation process of the air duct housing 612, the first limiting portion 6123b and the second limiting portion 6143a are matched with the bracket 614 all the time, and the bracket 614 can limit and support the air duct housing 612. Since the supporting positions are located at opposite ends of the air duct housing 612 in the axial direction, the load on the central axis of the connection between the air duct assembly 61 and the main body 40 is effectively reduced, so that the rotation of the air duct assembly 61 is more stable.

[0049] It should be noted that "concave-convex matching" means that the air duct housing 612 is provided with a concave portion and / or a convex portion, and the bracket 614 is provided with a convex portion and / or a concave portion matching with the air duct housing 612, and the convex portion of the air duct housing 612 can extend into the concave portion of the bracket 614, and the convex portion of the bracket 614 can extend into the concave portion of the air duct housing 612, so that the first limiting portion 6123b and the second limiting portion 6143a are matched with each other. It can be understood that the shape, number and position relationship of the concave portion and the convex portion are not limited, and can be set as needed to meet the different matching requirements of the air duct housing 612 and the bracket 614.

[0050] Please combine Figures 3, 6 and 7. Figure 6 shows a schematic structural diagram of a partial air duct shell of an embodiment of the present application, and Figure 7 shows a schematic structural diagram of a partial air duct shell from another angle of an embodiment of the present application.

[0051] In some embodiments, the air duct housing 612 is a hollow housing structure formed by splicing two parts, an air supply duct is formed in the air duct housing 612, and an air duct outlet 6123a and an air duct inlet 6121a connected to the air supply duct are provided. In this way, the wind wheel 63 is rotatably arranged in the air supply duct, and the axial direction of the wind wheel 63 is parallel to the axial direction of the air duct housing 612. Under the negative pressure of the wind wheel 63, air in the external environment can flow into the air supply duct from the air duct inlet 6121a, and then flow out from the air duct outlet 6123a.

[0052] Specifically, the air duct housing 612 includes two air duct end walls 6121 and an air duct side wall 6123. The two air duct end walls 6121 are spaced apart in the axial direction of the air duct housing 612, and each of the two air duct end walls 6121 is provided with an air duct inlet 6121a connected to the air supply duct. The air duct side wall 6123 is located between the two air duct end walls 6121 and surrounds the edges of the two air duct end walls 6121 in the circumferential direction. The air duct side wall 6123 is provided with an air duct outlet 6123a extending in the circumferential direction of the air duct housing 612, and two first limiting portions 6123b are respectively provided at the edges of both sides of the air duct side wall 6123. In this way, the air in the external environment can flow into the air supply duct from the air duct inlets 6121a at both ends of the air duct housing 612 under the negative pressure of the wind wheel 63, and then flow out from the air duct outlet 6123a.

[0053] Please refer to Figures 2, 3 and 8, which shows a front view of a portion of the air duct housing of an embodiment of the present application. The bracket 614 is generally a disc-shaped structure, including a bracket end wall 6141 and a bracket side wall 6143. The bracket end wall 6141 is a mesh structure, the bracket side wall 6143 surrounds the edge of the bracket end wall 6141 along the circumferential direction, and the second limiting portion 6143a is provided on one side edge of the bracket side wall 6143 facing the air duct housing 612.

[0054] In this way, the two brackets 614 are respectively arranged at the opposite ends of the air duct shell 612 in the axial direction, and the second limiting portion 6143a of each bracket 614 is concave-convexly matched with the first limiting portion 6123b at one end of the air duct shell 612, so that the load of the air duct shell 612 is dispersed to its two ends in the axial direction.

[0055] Please refer to FIG. 5, FIG. 6, FIG. 7 and FIG. 8 again. In some embodiments, one of the first limiting portion 6123b and the second limiting portion 6143a is a groove, and the groove extends along the circumference of the air duct housing 612 or the bracket 614, and the depth of the groove gradually increases from the two ends to the center in the length direction. The other of the first limiting portion 6123b and the second limiting portion 6143a is a boss in the limiting groove, and the boss extends along the circumference of the air duct housing 612 or the bracket 614.

[0056] One of the first limiting portion 6123b and the second limiting portion 6143a is in an arc shape with a central angle of 250°-270°, and the other of the first limiting portion 6123b and the second limiting portion 6143a is in an arc shape with a central angle β of 90°-120°. It can be understood that the specific angles of the central angles of the first limiting portion 6123b and the second limiting portion 6143a can be set as needed to meet the requirements of different shaking angles.

[0057] Since the first limiting portion 6123b and the second limiting portion 6143a extend along the circumference of the air duct shell 612 and the bracket 614 respectively, the first limiting portion 6123b and the second limiting portion 6143a have a larger contact area, so that the load is evenly distributed in the circumferential direction of the air duct assembly 61, making the shaking movement of the air duct assembly 61 smoother.

[0058] As shown in FIG. 4 and FIG. 5 , as a preferred embodiment, the cross section of the groove perpendicular to the circumference of the air duct housing 612 or the bracket 614 in which it is located is rectangular, and the cross section of the boss perpendicular to the circumference of the air duct housing 612 or the bracket 614 in which it is located is rectangular, and the groove and the boss are both clearance-matched. In this way, the first limit portion 6123b and the second limit portion 6143a have a larger contact area, and the rotation of the air duct housing 612 is more stable. It can be understood that the shape of the cross section of the groove and the boss is not limited to this, and can also be a regular or irregular shape such as a semicircle, a trapezoid, etc., which is not limited here.

[0059] Specifically in one embodiment, as shown in Fig. 7 and Fig. 8, the two first limiting portions 6123b are grooves extending along the circumferential direction of the air duct side wall 6123 of the air duct housing 612, and the first limiting portion 6123b is in the shape of an arc with a central angle α of 250°-270°. As shown in Fig. 9 and Fig. 10, the second limiting portion 6143a is a boss convexly disposed on one side edge of the bracket side wall 6143 of the bracket 614, and the second limiting portion 6143a is in the shape of an arc with a central angle β of 90°-120°.

[0060] In this way, the second limiting portion 6143a on the bracket 614 is limited within the first limiting portion 6123b of the air duct housing 612, and the length of the second limiting portion 6143a is smaller than the length of the first limiting portion 6123b. When the air duct housing 612 rotates relative to the bracket 614, the second limiting portion 6143a can slide back and forth in the first limiting portion 6123b.

[0061] When the air supply device 60 is in the shaking state, the air duct housing 612 rotates in one direction relative to the bracket 614 under the drive of the shaking drive unit 65, and when the second limit portion 6143a reaches one end of the first limit portion 6123b, the shaking drive unit 65 drives the air duct assembly 61 to rotate in the opposite direction until the second limit portion 6143a reaches the other end of the first limit portion 6123b. The above process is repeated, thereby realizing the shaking function of the air supply device 60.

[0062] Please refer to FIG. 2 again. In some embodiments, the air duct housing 612 is further provided with a transmission rack 6123c extending in the circumferential direction. The shaking head drive unit 65 engages with the transmission rack 6123c to be transmission-connected with the air duct housing 612, thereby driving the air duct housing 612 to rotate relative to the bracket 614 through the transmission rack 6123c.

[0063] Specifically in one embodiment, the transmission gear rail 6123c is disposed on the shell side wall of the air duct shell 612 and is located on the outer periphery of the air duct shell 612, and in the axial direction of the air duct shell 612, the transmission gear rail 6123c is located between the two first limiting portions 6123b, and the transmission gear rail 6123c extends parallel to the two first limiting portions 6123b.

[0064] The oscillating head drive unit 65 includes an oscillating head drive component 652 and a transmission wheel 654. The oscillating head drive component 652 can be directly or indirectly connected to the main body 40 and is connected to the air duct assembly 61 in a transmission manner. The transmission wheel 654 is fixed to the output shaft of the oscillating head drive component 652, and the outer periphery of the transmission wheel 654 is engaged with the transmission rack 6123c.

[0065] Thus, the torque outputted by the output shaft of the oscillating drive member 652 drives the transmission wheel 654 to rotate, and the transmission wheel 654 drives the transmission rack 6123c to move, and finally drives the air duct housing 612 to rotate relative to the bracket 614 around a rotation axis parallel to the axial direction of the air duct housing 612.

[0066] The above-mentioned air duct assembly 61, air supply device 60 and air supply equipment 100, a transmission gear 6123c and a first limiting portion 6123b are arranged on the outer periphery of the air duct shell 612, and the brackets 614 at both ends of the air duct shell 612 are provided with a second limiting portion 6143a cooperating with the first limiting portion 6123b. Therefore, the air duct shell 612 rotates relative to the bracket 614 through the transmission gear 6123c under the drive of the shaking drive unit 65, and in the shaking process, the first limiting portion 6123b and the second limiting portion 6143a distribute the load of the air duct shell 612 on the periphery of the two ends of the air duct shell 612, thereby effectively reducing the load of the central axis at the connection between the air supply device 60 and the main body 40, weakening the stress concentration of the central axis, and the strain at the central axis is also reduced, so that the operation of the air supply equipment 100 is more stable.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An air duct assembly, characterized in that: include: The air duct housing (612) is provided with first limiting portions (6123b) at two opposite ends in the axial direction; and Two brackets (614) are respectively matched to two opposite ends of the air duct housing (612) in the axial direction, and each of the brackets (614) is provided with a second limiting portion (6143a) limited to the first limiting portion (6123b); The air duct housing (612) is capable of rotating relative to the bracket (614), and enables the first limiting portion (6123b) and the second limiting portion (6143a) to slide relative to each other.

2. The air duct assembly according to claim 1, characterized in that: The first limiting portion (6123b) and the second limiting portion (6143a) are matched in a concave-convex manner.

3. The air duct assembly according to claim 2, characterized in that: One of the first limiting portion (6123b) and the second limiting portion (6143a) is a groove, and the groove extends along the circumference of the air duct housing (612) or the bracket (614) where it is located, and the other of the first limiting portion (6123b) and the second limiting portion (6143a) is a boss limited in the groove, and the boss extends along the circumference of the air duct housing (612) or the bracket (614) where it is located.

4. The air duct assembly according to claim 3, characterized in that: One of the first limiting portion (6123b) and the second limiting portion (6143a) is in the shape of an arc with a central angle of 250°-270°, and the other of the first limiting portion (6123b) and the second limiting portion (6143a) is in the shape of an arc with a central angle of 90°-120°.

5. The air duct assembly according to claim 3, characterized in that: The cross-section of the groove perpendicular to the circumference of the air duct housing (612) or the bracket (614) where it is located is rectangular, and the cross-section of the boss perpendicular to the circumference of the air duct housing (612) or the bracket (614) where it is located is rectangular.

6. The air duct assembly according to claim 1, characterized in that: The air duct housing (612) comprises two air duct end walls (6121) and an air duct side wall (6123), the two air duct end walls (6121) being arranged at intervals in the axial direction of the air duct housing (612), and the air duct side wall (6123) being located between the two air duct end walls (6121) and surrounding the edges of the two air duct end walls (6121) in the circumferential direction; The two first limiting portions (6123b) are respectively arranged on opposite sides of the air duct side wall (6123) in the axial direction of the air duct housing (612).

7. The air duct assembly according to claim 1, characterized in that: Each of the brackets (614) comprises a bracket end wall (6141) and a bracket side wall (6143) surrounding the bracket end wall (6141) in a circumferential direction, and the second limiting portion (6143a) is arranged on a side edge of the bracket side wall (6143) close to the air duct housing (612).

8. An air supply device, characterized in that: The air supply device comprises an air duct assembly as claimed in any one of claims 1 to 7, wherein the air supply device further comprises an oscillating drive unit (65), wherein the oscillating drive unit (65) is in transmission connection with the air duct housing (612), and the oscillating drive unit (65) is used to drive the air duct housing (612) to rotate relative to the bracket (614).

9. The air supply device according to claim 8, characterized in that: The air duct housing (612) of the air duct assembly is provided with a transmission rack (6123c) extending in a circumferential direction, and the oscillating drive unit (65) is meshed with the transmission rack (6123c) to be transmission-connected with the air duct housing (612).

10. The air supply device according to claim 9, characterized in that: The transmission gear rail (6123c) is arranged on the outer periphery of the air duct housing (612), and in the axial direction of the air duct housing (612), the transmission gear rail (6123c) is located between the two first limiting portions (6123b).

11. An air supply device, characterized in that: It comprises the air supply device as described in any one of claims 8 to 10.

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