Air supply device

Abstract

The present invention relates to an air supply device, comprising an air guide tube, an impeller, a heating element and a wind direction switching component, wherein the impeller is located in the air guide tube, the wind direction switching component is located at the outlet end of the air guide tube, and the wind direction switching component and the air guide tube are arranged at intervals in the axial direction of the impeller, and a circumferential air outlet is formed at the outlet end of the air guide tube, when the wind direction switching component is switched to an open state, an axial air outlet is formed on the wind direction switching component, and when the wind direction switching component is switched to a closed state, the axial air outlet closes the wind direction switching component to form an interception plate, and the heating element is arranged at the circumferential air outlet to heat the airflow discharged from the circumferential air outlet. By arranging the wind direction switching component at the outlet end of the air guide tube, the air supply device has two states of axial air outlet and circumferential air outlet, and a heating element is arranged at the circumferential air outlet, so that warm air is delivered to the surroundings, thereby improving the comfort of use.

Description

Technical Field

[0001] The present invention relates to the technical field of air supply equipment, in particular to an air supply device. Background Art

[0002] With the improvement of people's living standards and the development of science and technology, users have higher and higher requirements for the comfort of using fans. In places with large spaces and a large number of people, one-way air supply devices cannot meet the needs of multiple users. Especially for air supply devices with warm air function, if the air supply direction is too single, in order to make the overall indoor temperature reach the target value, it will lead to a situation where the local temperature is high and the overall temperature is low, which will lead to poor comfort. Summary of the invention

[0003] Aiming at the technical problem of poor usage comfort, the present invention proposes an air supply device to improve usage comfort.

[0004] A wind supply device comprises an air guide tube, an impeller, a heating element and a wind direction switching component, wherein the impeller is located in the air guide tube, the wind direction switching component is located at the outlet end of the air guide tube, and the wind direction switching component and the air guide tube are arranged at an interval in the axial direction of the impeller, and a circumferential air outlet is formed at the outlet end of the air guide tube. When the wind direction switching component is switched to an open state, an axial air outlet is formed on the wind direction switching component, and when the wind direction switching component is switched to a closed state, the axial air outlet closes the wind direction switching component to form an interception plate, and the heating element is arranged at the circumferential air outlet to heat the airflow discharged from the circumferential air outlet.

[0005] The above scheme provides an air supply device, which provides the wind direction switching component at the outlet end of the air guide tube, so that the air supply device has two states of axial air outlet and circumferential air outlet, and the heating element is provided at the circumferential air outlet, so that warm air is delivered to the surroundings, thereby improving the comfort of use. Specifically, when the wind direction switching component is in the on state, it forms an axial air outlet by itself, so that the airflow in the air guide tube is mainly discharged from the axial air outlet along the axial direction. When it is necessary to deliver warm air to the surroundings, the wind direction switching component is closed, and the axial air outlet is closed to form an interception plate. Under the blocking effect of the interception plate, the airflow originally flowing along the axial direction of the impeller changes its flow direction and diffuses to the surroundings, and is discharged from the circumferential air outlet after being heated.

[0006] In one of the embodiments, the heating element is an annular structure, the heating element is connected to the air guide tube, and a hot air outlet is provided on the heating element.

[0007] In one of the embodiments, the heating element includes an annular PTC heating element, the PTC heating element is connected to the air guide tube, and a plurality of hot air outlets are provided on the PTC heating element, and the plurality of hot air outlets are arranged at intervals on the PTC heating element.

[0008] In one of the embodiments, it also includes an air outlet grille, which is arranged at the axial air outlet, and / or the wind direction switching component includes an outer frame body and a plurality of air guide plates arranged in the outer frame body, and the air guide plates are rotatable relative to the outer frame body. When the wind direction switching component is switched to an open state, the axial air outlet is formed between the air guide plates. When the wind direction switching component is switched to a closed state, the plurality of air guide plates are spliced ​​together with the outer frame body to form the intercepting plate.

[0009] In one of the embodiments, the outer frame body and the air guide tube are spaced apart in the axial direction of the impeller to form the circumferential air outlet, and the middle portion of the intercepting plate protrudes toward the impeller relative to its outer edge portion.

[0010] In one of the embodiments, the surface of the intercepting plate facing the impeller is an arc surface protruding toward the direction approaching the impeller.

[0011] In one embodiment, the diameter of the impeller is D, the height of the circumferential air outlet in the axial direction of the impeller is B, 17mm≤B≤1 / 8×D, and / or the height B of the circumferential air outlet in the axial direction of the impeller is not less than the height B1 of the heating element in the axial direction of the impeller.

[0012] In one embodiment, the diameter of the impeller is D, the air guide tube and the impeller are spaced apart, and the gap between the inner circumference of the air guide tube and the impeller is A, 1 / 50×D≤A≤1 / 25×D.

[0013] In one of the embodiments, it also includes an air inlet grille, the outer edge of which is connected to the inlet end of the air guide tube, the air inlet grille is an arc-shaped mesh structure that bulges outward relative to the air guide tube, and the inner circumferential surface of the inlet end of the air guide tube is a guiding arc surface with an aperture that gradually decreases in the direction of air flow.

[0014] In one embodiment, the diameter of the impeller is D, the diameter of the connection between the air inlet grille and the air guide tube is D1, and D1>D. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a schematic diagram of the structure of the air supply device described in this embodiment;

[0018] Figure 2 is an exploded view of the air supply device described in this embodiment;

[0019] Figure 3 is a cross-sectional view of the air supply device described in this embodiment;

[0020] Figure 4 is a cross-sectional view of the air supply device when discharging cold air;

[0021] Figure 5 for Figure 4 A front view of the structure composed of a wind direction switching assembly and an air outlet grille in the air supply device shown;

[0022] Figure 6 for Figure 5 a bottom view of the structure shown;

[0023] Figure 7 is a cross-sectional view of the air supply device when hot air is discharged;

[0024] Figure 8 for Figure 7 A front view of the structure composed of a wind direction switching assembly and an air outlet grille in the air supply device shown;

[0025] Fig. 9 for Figure 8 Bottom view of the structure shown.

[0026] Description of reference numerals:

[0027] 10. Air supply device; 11. Air guide tube; 111. Circumferential air outlet; 112. Guide arc surface; 12. Impeller; 13. Heat-generating element; 131. Hot air outlet; 14. Wind direction switching assembly; 141. Axial air outlet; 142. Interceptor plate; 143. Outer frame body; 144. Air guide plate; 15. Air outlet grille; 16. Air inlet grille; 161. Annular air guide ribs; 162. Arc-shaped air guide ribs; 17. First outer shell; 18. Second outer shell. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention 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 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 violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0029] like Figures 1 to 3 As shown, in one embodiment, an air supply device 10 is provided, comprising an air guide tube 11, an impeller 12, a heating element 13 and a wind direction switching assembly 14. The impeller 12 is located in the air guide tube 11. The impeller 12 rotates to suck the airflow at the inlet end of the air guide tube 11 into the air guide tube 11, and then flows out from the outlet end of the air guide tube 11 at a high speed.

[0030] like Figures 1 to 4 as well as Figure 7 As shown, the wind direction switching assembly 14 is located at the outlet end of the air guide 11, and the wind direction switching assembly 14 is spaced apart from the air guide 11 in the axial direction of the impeller 12, and a circumferential air outlet 111 is formed at the outlet end of the air guide 11. In other words, the wind direction switching assembly 14 located at the outlet end of the air guide 11 does not completely block the outlet end of the air guide 11. As a result, the airflow discharged from the air guide 11 can be diffused from the circumferential air outlet 111 to the surroundings of the air supply device 10. It is ensured that the air supply device 10 has the function of 360° full-circle warm air supply.

[0031] Furthermore, if Figures 4 to 6 As shown, when the wind direction switching component 14 is switched to the on state, an axial air outlet 141 is formed on the wind direction switching component 14. The airflow discharged from the air guide 11 mainly passes through the axial air outlet 141 along the axial direction of the impeller 12 and is discharged outside the air supply device 10. Figures 7 to 9 As shown, when the wind direction switching assembly 14 is switched to the closed state, the axial air outlet 141 is closed, and the wind direction switching assembly 14 forms an interception plate 142, so that the airflow discharged from the air guide tube 11 along the axial direction of the impeller 12 changes its flow direction and passes through the circumferential air outlet 111. The heating element 13 is arranged at the circumferential air outlet 111 to heat the airflow discharged from the circumferential air outlet 111.

[0032] The above scheme provides an air supply device 10, by arranging the wind direction switching assembly 14 at the outlet end of the air guide tube 11, so that the air supply device 10 has two states of axial air outlet and circumferential air outlet, and the heating element 13 is arranged at the circumferential air outlet 111, so that warm air is delivered to the surroundings, thereby improving the comfort of use. Specifically, Figures 4 to 6 As shown, when the wind direction switching assembly 14 is in the open state, it forms an axial air outlet 141, so that the airflow in the air guide tube 11 is mainly discharged from the axial air outlet 141 along the axial direction. Figures 7 to 9 As shown, the wind direction switching component 14 is closed, and the axial air outlet 141 is closed to form an interception plate 142. Under the blocking effect of the interception plate 142, the airflow originally flowing along the axial direction of the impeller 12 changes its flow direction and diffuses to the surroundings, and is discharged from the circumferential air outlet 111 after being heated.

[0033] Specifically, Figures 1 to 3 As shown, in one embodiment, the heating element 13 is an annular structure, the heating element 13 is connected to the air guide tube 11 , and a hot air outlet 131 is provided on the heating element 13 .

[0034] The annular heating element 13 can block the circumferential air outlet 111 . When the wind direction switching component 14 is closed so that the air flows toward the circumferential air outlet 111 , the heating element 13 heats the gas, and the heated gas is discharged from the hot air outlet 131 at a high speed.

[0035] More specifically, in one embodiment, the heating element 13 includes a PTC heating element. Optionally, the heating element 13 may also include other devices capable of heating gas.

[0036] For example, in one embodiment, the heating element 13 includes an annular PTC heating element, and the PTC heating element is connected to the air guide tube 11. The PTC heating element is provided with a plurality of hot air outlets 131, and the plurality of hot air outlets 131 are arranged at intervals on the PTC heating element.

[0037] To a certain extent, the PTC heating element provided with multiple hot air outlets 131 can be regarded as a grille arranged at the circumferential air outlet 111. When the airflow passes through, it can not only play a guiding role, but also heat the gas, so that the air supply device 10 has the function of conveying hot air to the surroundings.

[0038] Further, in one embodiment, if Figures 1 to 9As shown, the air supply device 10 further includes an air outlet grille 15, which is disposed at the axial air outlet 141. When the wind direction switching assembly 14 is in the on state, cold air is blown out from the axial air outlet 141 and discharged into the room after passing through the air outlet grille 15. Here, the air outlet grille 15 is disposed at the axial air outlet 141, and can be specifically as follows: Figures 1 to 9 As shown, during the cold air discharge process, in the axial direction of the impeller 12 , the air outlet grille 15 is located downstream of the axial air outlet 141 .

[0039] More specifically, in one embodiment, Figures 1 to 4 as well as Figure 7 As shown, the wind direction switching assembly 14 includes an outer frame body 143 and a plurality of wind deflectors 144 disposed in the outer frame body 143. The wind deflectors 144 are rotatable relative to the outer frame body 143. When the wind direction switching assembly 14 is switched to an open state, the axial air outlet 141 is formed between the wind deflectors 144; when the wind direction switching assembly 14 is switched to a closed state, the plurality of wind deflectors 144 are spliced ​​together with the outer frame body 143 to form the interception plate 142.

[0040] When cold air needs to be discharged, each of the air guide plates 144 rotates relative to the outer frame body 143 until the axial air outlet 141 is opened, and when there is no excessive resistance in the axial direction of the impeller 12, the airflow in the air guide tube 11 continues to be discharged from the air supply device 10 along the axial direction from the axial air outlet 141. When hot air needs to be discharged, each of the air guide plates 144 rotates to form the intercepting plate 142 together with the outer frame body 143, and under the obstruction of the intercepting plate 142, the airflow in the air guide tube 11 is discharged from the air supply device 10 from the circumferential air outlet 111.

[0041] Specifically, the air guide plate 144 can be fan-shaped, and multiple air guide plates 144 can be spliced ​​into a complete circle. The outer edge of the air guide plate 144 is rotatably connected to the outer frame body 143. The air supply device 10 further includes a driving member and a transmission mechanism, and the transmission mechanism is connected between the driving member and the air guide plate 144 to drive the air guide plate 144 to rotate. When the wind direction switching component 14 is switched to the open state, the air guide plate 144 rotates to a plane parallel to the axis of the impeller 12. At this time, each air guide plate 144 is arranged at intervals to form the axial air outlet 141.

[0042] Alternatively, in another embodiment, the air guide plate 144 is a strip plate spanning across the outer frame body 143, each strip plate is arranged in parallel with each other, and each strip plate forms a shutter structure capable of shielding the middle hole surrounded by the outer frame body 143. The transmission mechanism is connected to the strip plate, and the driving member can open or close the shutter structure through the transmission mechanism.

[0043] Furthermore, if Figures 1 to 4 as well as Figure 7 As shown, the air outlet grille 15 is connected to the outer frame body 143. When the air supply device 10 is assembled, as shown in FIG. Figure 1 and Figure 2 As shown, the air outlet grille 15 blocks the air guide plate 144 on the side of the air outlet grille 15 facing the impeller 12 .

[0044] More specifically, in one embodiment, Figure 4 and Figure 7 As shown, the outer frame body 143 and the air guide cylinder 11 are arranged at intervals in the axial direction of the impeller 12 to form the circumferential air outlet 111. In other words, the circumferential air outlet 111 is a gap between the outer frame body 143 and the air guide cylinder 11. When the wind direction switching assembly 14 is in a closed state, the airflow in the air guide cylinder 11 can only be discharged from the gap to the surroundings outside the air supply device 10. The circumferential air outlet 111 is an annular opening arranged along the circumference of the air guide cylinder 11.

[0045] Furthermore, if Figure 3 , Figure 4 and Figure 7 As shown, the middle part of the intercepting plate 142 protrudes toward the impeller 12 relative to its outer edge. Thus, the intercepting plate 142 can not only change the direction of the airflow that originally flows along the axial direction of the air guide tube 11, but also provide guidance for the airflow discharged from the circumferential air outlet 111, so that the gas has an initial speed of oblique upward flow during the circumferential discharge process, reducing the impact of the wall jet during the circumferential exhaust process. Specifically, in the case of Figure 3 , Figure 4 and Figure 7 At the angle shown, the surface of the intercepting plate 142 facing the impeller 12 is inclined relative to the cross section perpendicular to the axis of the impeller 12, and gradually inclines away from the impeller 12 in the direction away from the center, thereby providing an oblique upward guiding effect for the airflow.

[0046] Specifically, in one embodiment, the surface of the intercepting plate 142 facing the impeller 12 is a circular arc surface protruding toward the impeller 12. This can not only avoid the influence of the aforementioned jet phenomenon, but also reduce the energy loss when the airflow changes direction at the intercepting plate 142, thereby increasing the air volume of the whole machine.

[0047] Furthermore, in one embodiment, the diameter of the impeller 12 is D, such as Figure 4 and Figure 7 As shown, the height of the circumferential air outlet 111 in the axial direction of the impeller 12 is B, 17mm≤B≤1 / 8×D. This can avoid the situation where the circumferential air outlet 111 is too large, resulting in low wind speed during circumferential air outlet; and avoid the situation where the circumferential air outlet 111 is too small, affecting the air volume of the whole machine. In general, it plays a role in balancing the air volume and flow rate.

[0048] Further, in one embodiment, a height B of the circumferential air outlet 111 in the axial direction of the impeller 12 is not less than a height B1 of the heating element 13 in the axial direction of the impeller 12 , so that the heating element 13 can be disposed in the circumferential air outlet 111 .

[0049] Furthermore, in one embodiment, the diameter of the impeller 12 is D, the air guide cylinder 11 and the impeller 12 are spaced apart, and as Figure 4 and Figure 7 As shown, the gap between the inner circumference of the air guide cylinder 11 and the impeller 12 is A, 1 / 50×D≤A≤1 / 25×D.

[0050] The air guide 11 mainly plays the role of gathering wind, and prevents the air flow from diffusing to the surroundings and causing air volume loss during the rotation of the impeller 12. If the gap between the air guide 11 and the impeller 12 is too large, the wind gathering effect is not obvious. On the other hand, when the impeller 12 rotates, the velocity fluctuation of the turbulent boundary layer between the impeller 12 blades and the surface of the air guide 11 will produce a whistling sound. If the gap between the impeller 12 and the air guide 11 is too small, it will cause a lot of noise. Based on this, while comprehensively considering the noise and air volume, the gap A between the inner circumference of the air guide 11 and the impeller 12 is controlled to be 1 / 50×D≤A≤1 / 25×D.

[0051] Further, such as Figures 1 to 4 as well as Figure 7As shown, in one embodiment, the air supply device 10 further includes an air inlet grille 16, the outer edge of which is connected to the inlet end of the air guide tube 11, and the air inlet grille 16 is an arc-shaped mesh structure that bulges outward relative to the air guide tube 11. Therefore, when the impeller 12 rotates, in addition to a large amount of air entering the air inlet grille 16 axially from the impeller 12, a large amount of air will also enter the air inlet grille 16 from all sides in a direction that is at a certain angle to the axial direction of the impeller 12. Based on this, further, as Figure 4 and Figure 7 As shown, the inner peripheral surface of the inlet end of the air guide 11 is a guide arc surface 112 with a gradually decreasing aperture in the air flow direction. The guide arc surface 112 can provide guidance for the airflow entering the air inlet grille 16 from all sides, avoiding the sudden change of the flow direction of the gas after entering the air supply device 10. The phenomenon of airflow separation at the inlet end of the air guide 11 is improved, and the turbulence is reduced, and the radial vortex noise when the air flows into the air guide 11 is reduced, thereby achieving the effect of noise reduction of the whole machine.

[0052] More specifically, in one embodiment, Figure 3 As shown, the air inlet grille 16 includes an annular air guide rib 161 and a plurality of arc-shaped air guide ribs 162. One end of the plurality of arc-shaped air guide ribs 162 is distributed at the outer edge of the air inlet grille 16 and is arranged at intervals in the circumferential direction of the outer support of the air inlet grille 16, and the other end is gathered in the middle of the air inlet grille 16. The annular air guide rib 161 surrounds the axis of the impeller 12 and is staggered with each of the arc-shaped air guide ribs 162, forming an arc-shaped mesh structure convex outward relative to the air guide cylinder 11.

[0053] Further, in one embodiment, if Figure 3 , Figure 4 and Figure 7 As shown, the outer edge of the air inlet grille 16 is further provided with a first housing 17 that continues to extend in the axial direction of the impeller 12 with the curvature of the arc-shaped mesh structure, and the first housing 17 surrounds the outside of the air guide tube 11. The end of the air guide tube 11 away from the air inlet grille 16 is provided with an outwardly turned second housing 18, and the second housing 18 surrounds the outside of the air guide tube 11, and the first housing 17 and the second housing 18 are spliced. Figure 1 As shown in the figure, the overall appearance of the air supply device 10 is a smooth transition at the connection between the first shell 17 and the second shell 18.

[0054] Furthermore, the first shell 17 and the air inlet grille 16 are integrally formed, and the second shell 18 and the air guide cylinder 11 are integrally formed.

[0055] Furthermore, in one embodiment, the diameter of the impeller 12 is D, the diameter of the air inlet grille 16 at the connection with the air guide tube 11 is D1, and D1>D. The air flow range entering the air supply device 10 from the air inlet grille 16 is larger than the diameter of the impeller 12, and the air supply volume of the whole device is large.

[0056] In the description of the present invention, 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 invention 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 limiting the present invention.

[0057] 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 the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the present invention, 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 the present invention can be understood according to specific circumstances.

[0059] In the present invention, 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" or "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" or "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.

[0060] 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.

[0061] 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.

[0062] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An air supply device, characterized in that: The invention comprises an air guide tube, an impeller, a heating element and a wind direction switching component, wherein the impeller is located in the air guide tube, the wind direction switching component is located at the outlet end of the air guide tube, and the wind direction switching component and the air guide tube are arranged at intervals in the axial direction of the impeller, and a circumferential air outlet is formed at the outlet end of the air guide tube, when the wind direction switching component is switched to an open state, an axial air outlet is formed on the wind direction switching component, and when the wind direction switching component is switched to a closed state, the axial air outlet closes the wind direction switching component to form an interception plate, and the heating element is arranged at the circumferential air outlet to heat the airflow discharged from the circumferential air outlet; The diameter of the impeller is D, the height of the circumferential air outlet in the axial direction of the impeller is B, and 17 mm ≤ B ≤ 1 / 8 × D.

2. The air supply device according to claim 1, characterized in that: The heating element is an annular structure, the heating element is connected to the air guide tube, and a hot air outlet is provided on the heating element.

3. The air supply device according to claim 2, characterized in that: The heating element comprises an annular PTC heating element, the PTC heating element is connected to the air guide tube, a plurality of hot air outlets are arranged on the PTC heating element, and the plurality of hot air outlets are arranged at intervals on the PTC heating element.

4. The air supply device according to claim 1, characterized in that: It also includes an air outlet grille, which is arranged at the axial air outlet, and / or the wind direction switching component includes an outer frame body and a plurality of air guide plates arranged in the outer frame body, the air guide plates are rotatable relative to the outer frame body, and when the wind direction switching component is switched to an open state, the axial air outlet is formed between the air guide plates, and when the wind direction switching component is switched to a closed state, the plurality of air guide plates are spliced ​​together with the outer frame body to form the intercepting plate.

5. The air supply device according to claim 4, characterized in that: In the axial direction of the impeller, the outer frame body and the air guide tube are spaced apart to form the circumferential air outlet, and the middle portion of the intercepting plate protrudes toward the impeller relative to its outer edge portion.

6. The air supply device according to claim 5, characterized in that: The surface of the intercepting plate facing the impeller is an arc surface protruding toward the direction approaching the impeller.

7. The air supply device according to any one of claims 1 to 6, characterized in that: A height B of the circumferential air outlet in the axial direction of the impeller is not less than a height B1 of the heat generating element in the axial direction of the impeller.

8. The air supply device according to any one of claims 1 to 6, characterized in that: The diameter of the impeller is D, the air guide tube and the impeller are spaced apart, and the gap between the inner circumference of the air guide tube and the impeller is A, 1 / 50×D≤A≤1 / 25×D.

9. The air supply device according to any one of claims 1 to 6, characterized in that: It also includes an air inlet grille, the outer edge of which is connected to the inlet end of the air guide tube, the air inlet grille is an arc-shaped mesh structure that bulges outward relative to the air guide tube, and the inner circumferential surface of the inlet end of the air guide tube is a guiding arc surface with a gradually decreasing aperture in the direction of air flow.

10. The air supply device according to claim 9, characterized in that: The diameter of the impeller is D, and the diameter of the connection between the air inlet grille and the air guide tube is D1, where D1>D.

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