Air duct assembly and air supply device

Abstract

The present invention relates to an air duct assembly and an air supply device. The air duct assembly includes: a rotatable centrifugal impeller and a guide vane sleeved outside the centrifugal impeller; the guide vane has a guide surface, and the extension direction of the tangent plane at the tail of the guide surface coincides with the radial direction of the centrifugal impeller, so that the air flow generated by the centrifugal impeller blows out from the guide vane along the radial direction of the centrifugal impeller; the tail of the guide surface refers to the end of the guide surface far from the rotation axis of the centrifugal impeller. In this air duct assembly, a guide vane is sleeved outside the centrifugal impeller, and the extension direction of the tangent plane at the tail of the guide surface of the guide vane coincides with the radial direction of the centrifugal impeller, which can make the air flow generated by the centrifugal impeller blow out from the guide vane along the radial direction of the centrifugal impeller, and can solve the problem that the blowing direction of the centrifugal impeller does not coincide with the radial direction of the centrifugal impeller due to the fact that the extension direction of the tangent plane at the tail of the blades of the centrifugal impeller itself does not coincide with the radial direction of the centrifugal impeller. Furthermore, long-distance air supply can be realized, the air supply range can be expanded, and the user experience can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and particularly to an air duct assembly and a blowing device. Background Art

[0002] At present, electric fans on the market are usually equipped with a swing structure to achieve 360-degree air blowing, thereby improving the user experience. However, such electric fans that can achieve 360-degree air blowing have problems such as complex structure, high cost, and easy generation of swing noise. Summary of the Invention

[0003] Based on this, in view of the problems that the existing electric fans have complex structures, high costs, and are prone to generating swing noise due to the installation of a swing structure, the present application provides an air duct assembly and a blowing device, which can solve these problems through the cooperation of a centrifugal impeller and a guiding member.

[0004] An air duct assembly, the air duct assembly comprising: a rotatable centrifugal impeller and a guiding member sleeved outside the centrifugal impeller;

[0005] The guiding member has a guiding surface, and the extending direction of the tangent plane at the tail of the guiding surface coincides with the radial direction of the centrifugal impeller, so that the air flow generated by the centrifugal impeller blows out from the guiding member along the radial direction of the centrifugal impeller;

[0006] Wherein, the tail of the guiding surface refers to the end of the guiding surface far from the rotation axis of the centrifugal impeller.

[0007] In one embodiment, the tail of the guiding surface is a flat plate structure, and the flat plate structure extends along the radial direction of the centrifugal impeller.

[0008] In one embodiment, the tangent plane at the head of the guiding surface is parallel to the tangent plane at the end of the adjacent impeller blade in the centrifugal impeller;

[0009] Wherein, the head of the guiding surface refers to the end of the guiding surface close to the rotation axis of the centrifugal impeller, and the end of the impeller blade refers to the end of the impeller blade far from the rotation axis of the centrifugal impeller.

[0010] In one embodiment, the guiding member comprises: a first fixing ring, a second fixing ring, and a plurality of guiding vanes;

[0011] The first fixing ring and the second fixing ring are spaced apart along the length direction of the rotation axis of the centrifugal impeller, the guiding vanes are connected between the first fixing ring and the second fixing ring, and the guiding vanes surround the rotation axis of the centrifugal impeller.

[0012] In one embodiment, the guiding vanes are evenly distributed in the circumferential direction.

[0013] The air duct assembly described above can be applied to a air supply device, such as an electric fan. A guiding member is sleeved outside the centrifugal impeller. The extending direction of the tail section of the guiding surface of the guiding member coincides with the radial direction of the centrifugal impeller, so that the air flow generated by the centrifugal impeller can be blown out from the guiding member along the radial direction of the centrifugal impeller. It can solve the problem that the blowing direction of the centrifugal impeller does not coincide with the radial direction of the centrifugal impeller due to the fact that the extending direction of the tail section of the impeller blades of the centrifugal impeller itself does not coincide with the radial direction of the centrifugal impeller. Furthermore, it can achieve long-distance air supply, expand the air supply range, and improve the user experience.

[0014] An air supply device includes: a housing having an air inlet and an air outlet, and a driving member and the air duct assembly according to any one of the above provided in the housing;

[0015] When the driving member drives the centrifugal impeller to rotate, the external air flow flows into the housing through the air inlet and then flows out of the air outlet through the centrifugal impeller and the guiding of the guiding member in sequence.

[0016] In one embodiment, the air supply device further includes: an air outlet grille provided at the air outlet;

[0017] The air outlet grille includes: a first air outlet part for allowing the external air flow to flow out in a first direction, where the first direction is perpendicular to the rotation axis of the centrifugal impeller.

[0018] In one embodiment, the air outlet grille includes: a second air outlet part and / or a third air outlet part;

[0019] The second air outlet part is for allowing the external air flow to flow out in a second direction, where the angle between the second direction and the rotation axis of the centrifugal impeller is not equal to 90°;

[0020] The third air outlet part is for allowing the external air flow to flow out in a third direction, where the angle between the third direction and the rotation axis of the centrifugal impeller is not equal to 90°, and the third direction is opposite to the second direction.

[0021] In one embodiment, the air outlet grille can rotate relative to the mounting surface of the air supply device.

[0022] In one embodiment, the air outlet grille is rotatably provided on the housing.

[0023] In one embodiment, the air outlet grille is fixedly provided on the housing;

[0024] The air supply device further includes: a base, and the housing is rotatably provided on the base.

[0025] The air supply device as described above, such as an electric fan, is provided with a wind guiding member sleeved outside the centrifugal impeller. The extending direction of the tail section of the wind guiding surface of the wind guiding member coincides with the radial direction of the centrifugal impeller, enabling the air flow generated by the centrifugal impeller to blow out from the wind guiding member along the radial direction of the centrifugal impeller. This can solve the problem that the blowing direction of the centrifugal impeller does not coincide with the radial direction of the centrifugal impeller due to the fact that the extending direction of the tail section of the impeller blades of the centrifugal impeller itself does not coincide with the radial direction of the centrifugal impeller. Furthermore, it can achieve long-distance air supply, expand the air supply range, and improve the user experience. Description of the Drawings

[0026] Figure 1 Longitudinal sectional view of the air supply device provided by an embodiment of the present invention;

[0027] Figure 2 Cross-sectional view of the air supply device provided by an embodiment of the present invention;

[0028] Figure 3 Structural diagram of the centrifugal impeller provided by an embodiment of the present invention;

[0029] Figure 4 Cross-sectional structural diagram of the centrifugal impeller provided by an embodiment of the present invention;

[0030] Figure 5 Structural diagram of the wind guiding member provided by an embodiment of the present invention;

[0031] Figure 6 Top view of the wind guiding member provided by an embodiment of the present invention;

[0032] Figure 7 Structural diagram of the lower housing provided by an embodiment of the present invention;

[0033] Figure 8 Structural diagram of the air outlet grille provided by an embodiment of the present invention.

[0034] Among them, the reference numerals in the drawings are explained as follows:

[0035] 100, centrifugal impeller; 110, mounting skeleton; 120, impeller blades; 200, wind guiding member; 200a, wind guiding surface; 210, first fixing ring; 220, second fixing ring; 230, wind guiding vane; 300, housing; 300a, air inlet hole; 310, lower housing; 320, top cover; 400, driving member; 500, air outlet grille; 510, first air outlet part; 520, second air outlet part; 530, third air outlet part; 600, fixing bracket; 700, base. Detailed Embodiments

[0036] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0037] In the description of the present invention, 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", etc. 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 invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0039] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below", and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0042] An embodiment of the present invention provides an air duct assembly, as Figure 1 shown, the air duct assembly includes: a rotatable centrifugal impeller 100 and a wind guiding member 200 sleeved outside the centrifugal impeller 100; as Figure 2 shown, the wind guiding member 200 has a wind guiding surface 200a, and the extending direction of the tangent plane at the tail of the wind guiding surface 200a coincides with the radial direction of the centrifugal impeller 100, so that the air flow generated by the centrifugal impeller 100 blows out from the wind guiding member 200 along the radial direction of the centrifugal impeller 100; wherein, the tail of the wind guiding surface 200a refers to the end of the wind guiding surface 200a far from the axis of rotation of the centrifugal impeller 100. It should be noted that Figure 1 the arrow represents the gas flow direction.

[0043] As an example, the air duct assembly can be applied to a blowing device, such as an electric fan. Among them, as Figure 3 and Figure 4 shown, the centrifugal impeller 100 includes: a rotatable mounting skeleton 110 and a plurality of impeller blades 120 arranged on the outer edge of the mounting skeleton 110, and the impeller blades 120 surround the periphery of the axis of rotation of the mounting skeleton 110. As Figure 1 shown, when the centrifugal impeller 100 rotates, external air enters the gap between the impeller blades 120 and the mounting skeleton 110 along the axial direction of the centrifugal impeller 100 (i.e., the extending direction of the axis of rotation of the mounting skeleton 110), and then flows out through the guiding of the impeller blades 120. Among them, in order to ensure air outlet, the extending direction of the tangent plane at the tail of the impeller blade 120 (i.e., the end of the impeller blade 120 far from the axis of rotation of the mounting skeleton 110) does not coincide with the radial direction of the centrifugal impeller 100. However, this will cause the blowing direction of the centrifugal impeller 100 not to coincide with the radial direction of the centrifugal impeller 100 (see Figure 4 ), and long-distance air supply cannot be achieved. In this regard, in the embodiment of the present invention, a wind guiding member 200 is sleeved outside the centrifugal impeller 100. By making the extending direction of the tangent plane at the tail of the wind guiding surface 200a of the wind guiding member 200 coincide with the radial direction of the centrifugal impeller 100, the air flow generated by the centrifugal impeller 100 can be blown out from the wind guiding member 200 along the radial direction of the centrifugal impeller 100, and long-distance air supply can be achieved. It should be noted that Figure 4 the dotted arrow in

[0044] The air duct assembly described above can be applied to a air supply device, such as an electric fan. An air guiding member 200 is sleeved outside the centrifugal impeller 100. The extending direction of the tail section plane of the air guiding surface 200a of the air guiding member 200 coincides with the radial direction of the centrifugal impeller 100, so that the air flow generated by the centrifugal impeller 100 can be blown out from the air guiding member 200 along the radial direction of the centrifugal impeller 100. This can solve the problem that the blowing direction of the centrifugal impeller 100 does not coincide with the radial direction of the centrifugal impeller 100 due to the fact that the extending direction of the tail section plane of its own impeller blades 120 does not coincide with the radial direction of the centrifugal impeller 100. Furthermore, long-distance air supply can be realized, the air supply range can be expanded, and the user experience can be improved.

[0045] As Figure 2 shown, in some embodiments of the present invention, the tail of the air guiding surface 200a is a flat plate structure, and the flat plate structure extends along the radial direction of the centrifugal impeller 100. In this way, the adjustment area in the air guiding surface 200a that can make the air flow flow out along the radial direction of the centrifugal impeller 100 can be increased, the air outlet direction of the centrifugal impeller 100 can be effectively adjusted, and further, it can be effectively ensured that the air flow generated by the centrifugal impeller 100 is blown out from the air guiding member 200 along the radial direction of the centrifugal impeller 100. Of course, in some other embodiments of the present invention, the tail of the air guiding surface 200a can also be an arc-shaped plate structure. It should be noted that the adjustment area in the tail of the air guiding surface 200a of this type of structure that can make the air flow flow out along the radial direction of the centrifugal impeller 100 is not a surface but a line.

[0046] In some embodiments of the present invention, the section plane of the head of the air guiding surface 200a is parallel to the section plane of the tail end of the adjacent impeller blade 120 in the centrifugal impeller 100; the head of the air guiding surface 200a refers to the end of the air guiding surface 200a close to the rotating shaft of the centrifugal impeller 100, and the tail end of the impeller blade 120 refers to the end of the impeller blade 120 far from the rotating shaft of the centrifugal impeller 100. When the centrifugal impeller 100 rotates, the air flow generated by the centrifugal impeller 100 first flows out through the guiding of the impeller blade 120 and then flows to the adjacent air guiding surface 200a on the air guiding member 200. Since the section plane of the head of the air guiding surface 200a is parallel to the section plane of the tail end of the adjacent impeller blade 120 in the centrifugal impeller 100, the energy loss of the air flow during the process of flowing from the impeller blade 120 to the air guiding member 200 can be reduced.

[0047] As Figure 5 and Figure 6As shown, in some embodiments of the present invention, the air guiding member 200 includes: a first fixing ring 210, a second fixing ring 220, and a plurality of air guiding vanes 230; the first fixing ring 210 and the second fixing ring 220 are spaced apart along the axial direction of the rotating shaft of the centrifugal air wheel 100, the air guiding vanes 230 are connected between the first fixing ring 210 and the second fixing ring 220, and the air guiding vanes 230 surround the periphery of the rotating shaft of the centrifugal air wheel 100. It can be understood that there is a gap between two adjacent air guiding members 200, and the side walls of the air guiding vanes 230 facing the adjacent air guiding vanes 230 constitute the air guiding surface 200a of the air guiding member 200. The air guiding member 200 with such a structure is convenient for disassembly and assembly. Of course, in some other embodiments of the present invention, the air guiding member 200 may only include a plurality of air guiding vanes 230 surrounding the periphery of the rotating shaft of the centrifugal air wheel 100, and the air guiding vanes 230 are respectively installed in the housing 300 of the air supply device. It should be noted that Figure 6 The dotted arrow in it represents the air outlet direction of the air duct assembly.

[0048] Optionally, the air guiding vanes 230 can be connected to the first fixing ring 210 and the second fixing ring 220 by an integrally formed method or a welding method. Among them, the materials of the first fixing ring 210, the second fixing ring 220, and the air guiding vanes 230 can be selected as high-temperature resistant plastics, such as PPS (Phenylenesulfide).

[0049] Optionally, the air guiding vanes 230 are evenly distributed in the circumferential direction. In this way, the air output of the air duct assembly can be ensured to be uniform, improving the user experience. Regarding the number of the air guiding vanes 230, the embodiments of the present invention do not specifically limit it, for example Figure 5 and Figure 6 as shown in 24.

[0050] Another embodiment of the present invention further provides an air supply device, including: a housing 300 having an air inlet and an air outlet, and a driving member 400 and the air duct assembly according to any one of the above disposed in the housing 300; when the driving member 400 drives the centrifugal air wheel 100 to rotate, the external air flows into the housing 300 through the air inlet and flows out through the centrifugal air wheel 100 and the air guiding of the air guiding member 200 in sequence from the air outlet.

[0051] As an example, the air outlet device can be an electric fan. Such an electric fan can be placed on platforms such as a desktop or the ground. Among them, the air outlet is located above the air inlet.

[0052] As an example, the driving member 400 is a motor or a motor. As Figure 1 shown, the driving member 400 is installed in the housing 300 through a fixing bracket 600. Among them, the fixing bracket 600 can be an inverted straw hat structure, the brim of the straw hat structure is connected to the housing 300 (such as snap connection), and the driving member 400 is installed in the hat barrel of the straw hat structure.

[0053] For the air supply device as described above, such as an electric fan, a guide member 200 is sleeved outside the centrifugal impeller 100. The extending direction of the tail section of the air guiding surface 200a of the guide member 200 coincides with the radial direction of the centrifugal impeller 100, enabling the air flow generated by the centrifugal impeller 100 to blow out from the guide member 200 along the radial direction of the centrifugal impeller 100. This can solve the problem that the blowing direction of the centrifugal impeller 100 does not coincide with the radial direction of the centrifugal impeller 100 due to the fact that the extending direction of the tail section of the impeller blades 120 of the centrifugal impeller 100 itself does not coincide with the radial direction of the centrifugal impeller 100. Furthermore, it can achieve long-distance air supply, expand the air supply range, and improve the user experience.

[0054] As Figure 8 shown, in some embodiments of the present invention, the air supply device further includes: an air outlet grille 500 provided at the air outlet; the air outlet grille 500 includes: a first air outlet portion 510, and the first air outlet portion 510 is used to make the external air flow out along a first direction, where the first direction is perpendicular to the rotation axis of the centrifugal impeller 100. It can be understood that when the air supply device is placed on a platform such as a tabletop or the ground in the Figure 1 indicated direction, the first direction refers to the horizontal direction. Among them, the first air outlet portion 510 includes first air outlet holes, and the upper and lower hole walls of the first air outlet holes both extend along the first direction.

[0055] Optionally, as Figure 1 shown, the housing 300 includes: a lower housing 310 and a top cover 320; the air outlet grille 500 is connected between the lower housing 310 and the top cover 320; a fixing bracket 600 is connected between the top cover 320 and the air outlet grille 500. Among them, as Figure 7 shown, the lower housing 310 has a plurality of air inlet holes 300a, and the plurality of air inlet holes 300a form an air inlet. Of course, in some other embodiments of the present invention, an air inlet grille can also be installed at the air inlet. The lower housing 310 can be an integral structure or can be formed by splicing a plurality of components (for example, 2 components).

[0056] Furthermore, in some embodiments of the present invention, as Figure 8 shown, the air outlet grille 500 includes: a second air outlet portion 520 or / and a third air outlet portion 530; the second air outlet portion 520 is used to make the external air flow out along a second direction, where the second direction has an angle not equal to 90° with the rotation axis of the centrifugal impeller 100; the third air outlet portion 530 is used to make the external air flow out along a third direction, where the third direction has an angle not equal to 90° with the rotation axis of the centrifugal impeller 100, and the third direction is opposite to the second direction. It can be understood that when the air supply device is placed in the Figure 1When placed on a platform such as a desktop or the ground in the indicated direction, the second direction refers to an obliquely upward direction, and the third direction refers to an obliquely downward direction. Among them, the second air outlet part 520 includes second air outlet holes, and the upper and lower hole walls of the second air outlet holes extend obliquely upward; the third air outlet part 530 includes third air outlet holes, and the upper and lower hole walls of the third air outlet holes extend obliquely downward. The second air outlet part 520 and the third air outlet part 530 can increase the air supply range of the air supply device in the axial direction of the centrifugal impeller 100 (that is, Figure 1 the upper and lower directions shown), improving the user experience.

[0057] Furthermore, in some embodiments of the present invention, the air outlet grille 500 can rotate relative to the installation surface of the air supply device. It should be noted that the installation surface refers to the platform for placing the air supply device described above, such as a desktop or the ground. In this way, the air supply device can blow air upward or downward at any position in the circumferential direction, increasing the air supply range and improving the user experience.

[0058] Regarding how to realize the rotation of the air outlet grille 500 relative to the installation surface of the air supply device, the following three examples are given:

[0059] The first example: The air outlet grille 500 is rotatably arranged on the housing 300. Among them, a first rotating part is installed in the housing 300 of the air supply device, and the first rotating part is used to rotate the air outlet grille 500. Among them, the first rotating part is a motor, and the output shaft of the motor is connected to the air outlet grille 500.

[0060] The second example: The air outlet grille 500 is fixedly arranged on the housing 300; as Figure 1 shown, the air supply device further includes: a base 700, and the housing 300 is rotatably arranged on the base 700. Among them, a second rotating part is arranged on the base 700, and the second rotating part is used to rotate the housing 300. Exemplarily, a bearing is arranged on the base 700, the second rotating part is a motor, and the output shaft of the motor and the housing 300 are both connected to the inner ring of the bearing.

[0061] The third example: The air outlet grille 500 is rotatably arranged on the housing 300; the air supply device further includes: a base 700, the housing 300 is rotatably arranged on the base 700, and the housing 300 and the air outlet grille 500 have the same or opposite rotation directions and different rotation speeds to ensure that the air outlet grille 500 rotates relative to the installation surface of the air supply device. Among them, the rotatable arrangement method of the air outlet grille 400 is the same as that provided in the first example, and the rotatable arrangement method of the housing 300 is the same as that provided in the second example.

[0062] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0063] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. An air duct assembly, characterized in that, The air duct assembly includes: a rotatable centrifugal impeller (100) and a wind guiding member (200) sleeved outside the centrifugal impeller (100); The wind guiding member (200) has a wind guiding surface (200a), and the extending direction of the tangent plane at the tail of the wind guiding surface (200a) coincides with the radial direction of the centrifugal impeller (100), so that the air flow generated by the centrifugal impeller (100) blows out from the wind guiding member (200) along the radial direction of the centrifugal impeller (100). Herein, the tail of the wind guiding surface (200a) refers to the end of the wind guiding surface (200a) far from the rotating shaft of the centrifugal impeller (100); The tangent plane of the head of the wind guiding surface (200a) is parallel to the tangent plane of the tail end of the adjacent wind wheel blade (120) in the centrifugal impeller (100). The head of the wind guiding surface (200a) refers to the end of the wind guiding surface (200a) close to the rotating shaft of the centrifugal impeller (100), and the tail end of the wind wheel blade (120) refers to the end of the wind wheel blade (120) far from the rotating shaft of the centrifugal impeller (100); The wind guiding member (200) includes: a first fixing ring (210), a second fixing ring (220) and a plurality of wind guiding vanes (230); the first fixing ring (210) and the second fixing ring (220) are spaced apart along the length direction of the rotating shaft of the centrifugal impeller (100), the wind guiding vanes (230) are connected between the first fixing ring (210) and the second fixing ring (220), and the wind guiding vanes (230) surround the periphery of the rotating shaft of the centrifugal impeller (100).

2. The air duct assembly according to claim 1, characterized in that, The tail of the wind guiding surface (200a) is a flat plate structure, and the flat plate structure extends along the radial direction of the centrifugal impeller (100).

3. The air duct assembly according to claim 1, characterized in that, The wind guiding vanes (230) are evenly distributed in the circumferential direction.

4. An air supply device, characterized in that, It includes: A housing (300) having an air inlet and an air outlet, a driving member (400) disposed in the housing (300), and the air duct assembly according to any one of claims 1-3; When the driving member (400) drives the centrifugal impeller (100) to rotate, the external air flow flows into the housing (300) through the air inlet and then flows out from the air outlet through the guiding of the centrifugal impeller (100) and the wind guiding member (200) in sequence.

5. The air supply device according to claim 4, characterized in that, The air supply device further includes: an air outlet grille (500) disposed at the air outlet; The air outlet grille (500) includes: a first air outlet part (510), and the first air outlet part (510) is used for making the external air flow flow out along a first direction, wherein the first direction is perpendicular to the rotating shaft of the centrifugal impeller (100).

6. The air supply device according to claim 5, characterized in that, The air outlet grille (500) includes: a second air outlet part (520) or / and a third air outlet part (530); The second air outlet part (520) is used for making the external air flow flow out along a second direction, wherein the included angle between the second direction and the rotating shaft of the centrifugal impeller (100) is not equal to 90°; The third air outlet part (530) is used to make the external air flow out along a third direction, where there is an angle other than 90° between the third direction and the rotation axis of the centrifugal air impeller (100), and the third direction is opposite to the second direction.

7. The air supply device according to claim 6, characterized in that, The air outlet grille (500) is rotatable relative to the installation surface of the air supply device.

8. The air supply device according to claim 7, characterized in that, The air outlet grille (500) is rotatably arranged on the housing (300).

9. The air supply device according to claim 7, wherein, The air outlet grille (500) is fixedly arranged on the housing (300).

10. The air supply device according to claim 9, characterized in that, The air supply device further includes: a base (700), and the housing (300) is rotatably arranged on the base (700).

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