A high speed fan

Abstract

The utility model provides a kind of high-speed fan, including: motor assembly;Fan shell, motor assembly is sleeved, the direction of the air flow produced by the outer periphery of cooperation motor assembly is formed air inlet end and air outlet end respectively, the surface of the motor upper shell located in air outlet end is equipped with several air deflector;Annular air inlet cover, connect the air inlet end of fan shell;Circular arc air outlet cover, connect the air outlet end of fan shell, the outer wall of fan shell, the inner wall of circular arc air outlet cover are divided to form several air ducts of annular arrangement by air deflector, air flow produced by motor assembly is shunted as sub-air flow by air duct, sub-air flow is emitted outward from the air outlet opening in the center of circular arc air outlet cover, the surface of the motor upper shell exposed in air outlet opening is equipped with a annular groove that reduces the impact of return air flow entering air outlet opening on sub-air flow.The utility model can improve air duct structure under the premise that motor power is unchanged, effectively increase the air volume of fan, and improve the mute effect.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning equipment, and more specifically, to a high-speed fan. Background Technology

[0002] To achieve miniaturization, existing bladeless high-speed fans typically use vertical shaft fans. Because the airflow direction needs to be bent (directing the airflow to a horizontal direction), bladeless high-speed fans have disadvantages such as lower airflow and poorer noise reduction compared to traditional high-speed fans of similar size.

[0003] Figure 1 This is a schematic diagram of the structure of a bladeless fan in the existing technology. (Example:) Figure 1 As shown, the bladeless fan 9 includes: a housing 91, a motor 92, an air inlet 93, an air outlet 94, and plate-shaped air guide vanes 96. The housing 91 surrounds the motor 92, and an air duct 95 is formed between the inner wall of the housing 91 and the outer wall of the motor 92. The air inlet 93 and the air outlet 94 are respectively located at the inlet and outlet of the air duct 95. The plate-shaped air guide vanes 96 are arranged radially in the air duct 95 to cut the airflow L1 generated by the motor 92 into several sub-airflows L2. The sub-airflows L2 converge before the air outlet 94 and are then emitted outward.

[0004] Even if the motor power is increased to produce a stronger sub-airflow, the cross-section of the air duct 95 will form a positive pressure air zone and a negative pressure air zone. The return airflow L3 drawn in from the negative pressure air zone will block the air duct 95 (forming a side effect similar to an air wall, reducing the air volume) and impact the sub-airflow L2, thereby reducing the air volume and generating noise.

[0005] Therefore, this utility model provides a high-speed fan. Utility Model Content

[0006] In view of the problems in the prior art, the purpose of this utility model is to provide a high-speed fan that overcomes the limitations of the prior art. By improving the air duct structure, the fan can effectively increase the air volume while improving the noise reduction effect without changing the motor power.

[0007] An embodiment of this utility model provides a high-speed fan, comprising:

[0008] The motor assembly includes: a motor, an upper motor housing surrounding the motor, a lower motor housing, and an impeller that generates airflow;

[0009] The fan housing is fitted with the motor assembly, and the outer periphery of the motor assembly forms an air inlet and an air outlet along the direction of airflow. The surface of the upper housing of the motor located at the air outlet is provided with several air guide vanes.

[0010] An annular air inlet shroud connects to the air inlet end of the fan housing; and

[0011] An arc-shaped air outlet shroud connects to the air outlet end of the fan housing. The outer wall of the fan housing and the inner wall of the arc-shaped air outlet shroud are divided by the air guide plate to form several circumferentially arranged air ducts. The airflow generated by the motor assembly is split into sub-airflows through the air ducts. The sub-airflows are emitted outward from the air outlet opening in the center of the arc-shaped air outlet shroud. The surface of the upper housing of the motor exposed above the air outlet opening is provided with an annular groove to reduce the impact of the return airflow entering the air outlet opening on the sub-airflows.

[0012] Preferably, the annular groove prevents the return airflow from flowing along the surface of the motor housing to the sub-airflow.

[0013] Preferably, the bottom of the annular groove has a circular arc cross-section, and the annular groove guides the direction of the return airflow entering the air outlet so that the bent return airflow merges with the sub-airflow in the same direction.

[0014] Preferably, the sub-airflow is emitted outward from the positive pressure air zone at the end of the air duct away from the center, the return airflow enters the air outlet from the negative pressure air zone at the end of the air duct near the center, and the extension trajectory of the annular groove is set between the positive pressure air zone and the negative pressure air zone.

[0015] Preferably, the impeller is disposed between the inner side of the air inlet end of the fan housing and the outer surface of the lower housing of the motor, and the impeller is rotated by the motor to generate airflow.

[0016] Preferably, the upper housing of the motor has a central protrusion, and the air guide vane is connected from the outer periphery of the central protrusion to the inner wall of the annular air inlet shroud.

[0017] Preferably, the upper housing of the motor is provided with a plurality of heat dissipation holes communicating with the motor, the heat dissipation holes being exposed in the air outlet opening, and the heat dissipation holes being distributed on the outer periphery of the central protrusion and in the annular groove.

[0018] Preferably, the air outlet edge of the arc-shaped air outlet hood is provided with a serrated edge, and the air guide plate has an upper edge protruding above the fan housing and a side edge protruding from the side of the fan housing. The side edges respectively abut against the inner side of the tip of the serrated edge, and the side edges form an arc-shaped contact trajectory with the inner wall of the arc-shaped air outlet hood.

[0019] Preferably, the outer periphery of the motor assembly is provided with a plurality of positioning sleeves;

[0020] The outer periphery of the arc-shaped air outlet shroud is provided with several first positioning screw seats;

[0021] The outer periphery of the fan housing is provided with a plurality of second positioning screw seats, the second positioning screw seats are inserted into the positioning sleeve, and the first positioning screw seat is screwed to the second positioning screw seat protruding from the positioning sleeve.

[0022] Preferably, the end of the air duct is connected to the air outlet.

[0023] The high-speed fan of this invention can effectively increase the air volume of the fan while improving the noise reduction effect, without changing the motor power, through improvements in the air duct structure. Attached Figure Description

[0024] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the structure of a bladeless fan in the existing technology.

[0026] Figure 2 This is a perspective view of the high-speed fan of this utility model.

[0027] Figure 3 This is a top view of the high-speed fan of this utility model.

[0028] Figure 4 This is a perspective view of the high-speed fan of this utility model after removing the arc-shaped air outlet cover.

[0029] Figure 5 This is a cross-sectional view of the high-speed fan of this utility model after removing the arc-shaped air outlet cover.

[0030] Figure 6 This is a perspective view of the arc-shaped air outlet cover of the high-speed fan of this utility model.

[0031] Figure 7 This is a schematic diagram of the air duct in one working state of the high-speed fan of this utility model.

[0032] Figure 8 This is a schematic diagram of the air duct in another working state of the high-speed fan of this utility model.

[0033] Figure Labels

[0034] 1. Arc-shaped air vent

[0035] 11. Serrated edges

[0036] 12 air outlets

[0037] 13 First positioning screw seat

[0038] 2 Motor assembly

[0039] 20 positioning sleeves

[0040] 21. Central protrusion

[0041] 22 air guide vanes

[0042] 221 Upper edge

[0043] 222 Side edge

[0044] 23 Air duct

[0045] 24 ventilation holes

[0046] 25 Annular groove

[0047] 26 Motor housing

[0048] 27. Lower casing of the motor

[0049] 28 Impeller

[0050] 29 Electric Motor

[0051] 3. Fan casing

[0052] 31 Second positioning screw seat

[0053] 4. Air Inlet Cover

[0054] 9. Traditional fans

[0055] 91. Outer shell

[0056] 92 motor

[0057] 93 Air Inlet

[0058] 94 Air vent

[0059] 95 air duct

[0060] 96 Plate-shaped air guide vanes

[0061] H Positive pressure wind zone

[0062] L Negative pressure air zone Detailed Implementation

[0063] The following specific examples illustrate the implementation methods of this application. Those skilled in the art can easily understand the other advantages and effects of this application from the content disclosed herein. This application can also be implemented or applied through other different specific embodiments, and various details in this application can be modified or changed according to different viewpoints and application systems without departing from the spirit of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0064] The embodiments of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement the application. This application may be embodied in many different forms and is not limited to the embodiments described herein.

[0065] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0066] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0067] For the purpose of clearly describing this application, devices that are not relevant to the description are omitted, and the same or similar components throughout the specification are given the same reference numerals.

[0068] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0069] When we say that a device is "above" another device, this can mean that it is directly above the other device, or it can mean that other devices are present in between. Conversely, when we say that a device is "directly" "above" another device, there are no other devices present in between.

[0070] Although the terms first, second, etc., are used in some instances herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0071] The technical terms used herein are for reference only to specific embodiments and are not intended to limit the scope of this application. The singular form used herein includes the plural form unless the statement explicitly indicates otherwise. The word "comprising" as used in the specification means to specify a particular characteristic, region, integer, step, operation, element, and / or component, and does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0072] Although not explicitly defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with the relevant technical literature and the content of this present application, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0073] Figure 2 This is a perspective view of the high-speed fan of this utility model. Figure 3 This is a top view of the high-speed fan of this utility model. Figure 4 This is a perspective view of the high-speed fan of this utility model after removing the arc-shaped air outlet cover. Figure 5 This is a cross-sectional view of the high-speed fan of this utility model after removing the arc-shaped air outlet cover. Figure 6 This is a perspective view of the arc-shaped air outlet shroud of the high-speed fan of this utility model. Figures 2 to 6As shown, this utility model provides a high-speed fan, including: a motor assembly 2, a fan housing 3, an annular air inlet shroud 4, and an arc-shaped air outlet shroud 1. The motor assembly 2 includes: a motor 29, an upper motor housing 26 surrounding the motor 29, a lower motor housing 27, and an impeller 28 that generates airflow. The fan housing 3 is fitted onto the motor assembly 2, and the outer periphery of the motor assembly 2 forms an air inlet and an air outlet along the direction of the airflow L1. The surface of the upper motor housing 26 at the air outlet end is provided with several guide vanes 22. The annular air inlet shroud 4 is connected to the air inlet end of the fan housing 3. The arc-shaped air outlet shroud 1 connects to the air outlet end of the fan housing 3. The outer wall of the fan housing 3 and the inner wall of the arc-shaped air outlet shroud 1 are divided by guide vanes 22 to form several circumferentially arranged air ducts 23. The airflow generated by the motor assembly 2 is split into sub-airflows L2 through the air ducts 23. The sub-airflows L2 are emitted outward from the air outlet opening 12 in the center of the arc-shaped air outlet shroud 1. An annular groove 25 is provided on the surface of the motor upper housing 26 exposed above the air outlet opening 12 to reduce the impact of the return airflow L3 entering the air outlet opening 12 on the sub-airflow L2. This invention, by providing an annular groove 25 on the surface of the motor upper housing 26, reduces the impact of the return airflow L3 drawn in from the negative pressure air zone on the sub-airflow L2, thereby increasing airflow and enhancing noise reduction. This invention reduces the impact of airflow inside the air duct, reduces the weakening of airflow by the air duct and related noise, and achieves a breakthrough in reducing the noise of the whole machine while increasing the air volume without increasing the motor power, thereby greatly improving the performance of the fan and optimizing the overall performance of the bladeless fan using this invention.

[0074] In a preferred embodiment, the annular groove 25 blocks the return airflow L3 from flowing along the surface of the motor housing 26 toward the sub-airflow L2, but is not limited thereto.

[0075] In a preferred embodiment, the bottom of the annular groove 25 has a circular arc cross-section. The annular groove 25 guides the direction of the return airflow L3 entering the air outlet 12 so that the bent return airflow L3 and the sub-airflow L2 flow in the same direction, but this is not a limitation.

[0076] In a preferred embodiment, the sub-airflow L2 is emitted outward from the positive pressure air zone H at the end of the air duct 23 away from the center, and the return airflow enters the air outlet 12 from the negative pressure air zone L at the end of the air duct 23 near the center. The extension trajectory of the annular groove 25 is set between the positive pressure air zone H and the negative pressure air zone L, but is not limited thereto.

[0077] In a preferred embodiment, the impeller 28 is disposed between the inner side of the air inlet end of the fan housing 3 and the outer surface of the motor lower housing 27. The impeller 28 is rotated by the motor 29 to generate airflow, but is not limited thereto.

[0078] In a preferred embodiment, a central protrusion 21 is provided in the center of the motor housing 26, and the air guide vane 22 is connected from the outer periphery of the central protrusion 21 to the inner wall of the annular air inlet shroud 4, but this is not a limitation.

[0079] In a preferred embodiment, the motor housing 26 is provided with a plurality of heat dissipation holes 24 that are connected to the motor 29. The heat dissipation holes 24 are exposed in the air outlet 12. The heat dissipation holes 24 are distributed on the outer periphery of the central protrusion 21 and in the annular groove 25, but are not limited thereto.

[0080] In a preferred embodiment, the air outlet 12 of the arc-shaped air outlet shroud 1 has a serrated edge 11, and the air guide vane 22 has an upper edge 221 protruding above the fan housing 3 and a side edge 222 protruding to the side of the fan housing 3. The side edges 222 respectively abut against the inner side of the tip of the serrated edge 11, and the side edges 222 form an arc-shaped contact trajectory with the inner wall of the arc-shaped air outlet shroud 1, but this is not a limitation.

[0081] In a preferred embodiment, the motor assembly 2 is provided with a plurality of positioning sleeves 20 on its outer periphery. The arc-shaped air outlet shroud 1 is provided with a plurality of first positioning screw seats 13 on its outer periphery. The fan housing 3 is provided with a plurality of second positioning screw seats 31 on its outer periphery. The second positioning screw seats 31 are inserted into the positioning sleeves 20, and the first positioning screw seats 13 are screwed to the second positioning screw seats 31 protruding from the positioning sleeves 20, but this is not a limitation.

[0082] In a preferred embodiment, the end of the air duct 23 is connected to the air outlet 12, but this is not a limitation.

[0083] The specific implementation of this utility model is as follows:

[0084] In this invention, the motor assembly 2 includes: a motor 29, an upper motor housing 26 surrounding the motor 29, a lower motor housing 27, and an impeller 28 that generates airflow. A fan housing 3 is fitted onto the motor assembly 2, and along the direction of airflow L1, forms an air inlet and an air outlet on the outer periphery of the motor assembly 2. The surface of the upper motor housing 26 at the air outlet is provided with several guide vanes 22. An annular air inlet shroud 4 connects to the air inlet of the fan housing 3. An arc-shaped air outlet shroud 1 connects to the air outlet of the fan housing 3. The outer wall of the fan housing 3 and the inner wall of the arc-shaped air outlet shroud 1 are divided by the guide vanes 22 to form several circumferentially arranged air ducts 23, the ends of which connect to the air outlet opening 12. The airflow generated by the motor assembly 2 is split into a sub-airflow L2 through the air duct 23. The sub-airflow L2 is emitted outward from the air outlet 12 in the center of the arc-shaped air outlet shroud 1. The surface of the motor housing 26 exposed above the air outlet 12 is provided with an annular groove 25 to reduce the impact of the return airflow entering the air outlet 12 on the sub-airflow L2. The annular groove 25 blocks the return airflow L3 from flowing along the surface of the motor housing 26 towards the sub-airflow L2. The bottom of the annular groove 25 has an arc cross-section, and the annular groove 25 guides the direction of the return airflow L3 entering the air outlet 12 so that the bent return airflow L3 and the sub-airflow L2 merge in the same direction. The sub-airflow L2 is emitted outward from the positive pressure air zone H at the end of the air duct 23 away from the center, and the return airflow enters the air outlet 12 from the negative pressure air zone L at the end of the air duct 23 near the center. The extension trajectory of the annular groove 25 is set between the positive pressure air zone H and the negative pressure air zone L. An impeller 28 is positioned between the inner side of the air inlet end of the fan housing 3 and the outer surface of the lower motor housing 27. The impeller 28 rotates under the transmission of the motor 29 to generate airflow. A central protrusion 21 is provided in the center of the upper motor housing 26, and a guide vane 22 connects from the outer periphery of the central protrusion 21 to the inner wall of the annular air inlet shroud 4. The upper motor housing 26 has several heat dissipation holes 24 that connect to the motor 29. The heat dissipation holes 24 are exposed at the air outlet opening 12 and are distributed on the outer periphery of the central protrusion 21 and within the annular groove 25. The air outlet opening 12 of the arc-shaped air outlet shroud 1 has a serrated edge 11. The guide vane 22 has an upper edge 221 protruding above the fan housing 3 and a side edge 222 protruding to the side of the fan housing 3. The side edges 222 abut against the inner side of the tip of the serrated edge 11, and the side edges 222 form an arc-shaped contact trajectory with the inner wall of the arc-shaped air outlet shroud 1. Several positioning sleeves 20 are provided on the outer periphery of the motor assembly 2. The outer periphery of the arc-shaped air outlet cover 1 is provided with several first positioning screw seats 13. The outer periphery of the fan housing 3 is provided with several second positioning screw seats 31, the second positioning screw seats 31 are inserted into the positioning sleeve 20, and the first positioning screw seats 13 are screwed to the second positioning screw seats 31 protruding from the positioning sleeve 20.

[0085] Figure 7 This is a schematic diagram of the air duct in one working state of the high-speed fan of this utility model. Figure 7As shown, the annular groove 25 in this utility model has a large depth, which blocks the return airflow L3 from flowing along the surface of the motor upper housing 26 towards the sub-airflow L2, thereby preventing the return airflow L3 from blocking the air duct 95. The return airflow L3 will not impact the sub-airflow L2, thereby increasing the air volume and enhancing the quietness effect.

[0086] Figure 8 This is a schematic diagram of the air duct in another working state of the high-speed fan of this utility model. (See diagram below.) Figure 7 As shown in this utility model Figure 7 Based on the existing embodiment, the bottom of the annular groove 25 is an arc cross-section, which changes the direction of the return airflow L3 entering the air outlet 12, allowing the bent return airflow to merge with the sub-airflow L2 in the same direction. Heat dissipation holes 24 are distributed around the central protrusion 21 and within the annular groove 25. Hot air passing through the heat dissipation holes is carried out by the return airflow L3 and merges with the sub-airflow in the same direction, being emitted outwards, thus enhancing heat dissipation capacity. This prevents the return airflow L3 from blocking the air duct 95, and the return airflow L3 does not impact the sub-airflow L2, thereby increasing airflow and enhancing the noise reduction effect.

[0087] In summary, the purpose of this utility model is to provide a high-speed fan that can effectively increase the air volume of the fan while improving the noise reduction effect, without changing the motor power, through improvements in the air duct structure.

[0088] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A high-speed fan, characterized in that, include: The motor assembly (2) includes: a motor (29), an upper motor housing (26) surrounding the motor (29), a lower motor housing (27) and an impeller (28) that generates airflow; The fan housing (3) is fitted with the motor assembly (2), and the outer periphery of the motor assembly (2) forms an air inlet and an air outlet respectively along the direction of the air flow (L1). The surface of the upper housing (26) of the motor located at the air outlet is provided with a number of air guide vanes (22). An annular air inlet shroud (4) is connected to the air inlet end of the fan housing (3); as well as The arc-shaped air outlet cover (1) is connected to the air outlet end of the fan housing (3). The outer wall of the fan housing (3) and the inner wall of the arc-shaped air outlet cover (1) are divided by the air guide plate (22) to form a number of air ducts (23) arranged in a ring. The air flow generated by the motor assembly (2) is split into sub-air flow (L2) through the air duct (23). The sub-air flow (L2) is emitted outward from the air outlet opening (12) in the center of the arc-shaped air outlet cover (1). The surface of the motor upper housing (26) exposed to the air outlet opening (12) is provided with an annular groove (25) to reduce the impact of the return airflow entering the air outlet opening (12) on the sub-air flow (L2).

2. The high-speed fan as described in claim 1, characterized in that, The annular groove (25) prevents the return airflow (L3) from flowing along the surface of the motor housing (26) toward the sub-airflow (L2).

3. The high-speed fan as described in claim 1, characterized in that, The bottom of the annular groove (25) has a circular arc cross section. The annular groove (25) guides the direction of the return airflow (L3) entering the air outlet (12) so that the bent return airflow (L3) merges with the sub-airflow (L2) in the same direction.

4. The high-speed fan as described in claim 1, characterized in that, The sub-airflow (L2) is emitted outward from the positive pressure air zone (H) at the end of the air duct (23) away from the center, and the return airflow enters the air outlet (12) from the negative pressure air zone (L) at the end of the air duct (23) near the center. The extension trajectory of the annular groove (25) is set between the positive pressure air zone (H) and the negative pressure air zone (L).

5. The high-speed fan as described in claim 1, characterized in that, The impeller (28) is located between the inner side of the air inlet end of the fan housing (3) and the outer surface of the motor lower housing (27). The impeller (28) is rotated by the motor (29) to generate airflow.

6. The high-speed fan as described in claim 1, characterized in that, The motor housing (26) has a central protrusion (21) in the center, and the air guide (22) is connected from the outer periphery of the central protrusion (21) to the inner wall of the annular air inlet cover (4).

7. The high-speed fan as described in claim 6, characterized in that, The upper housing (26) of the motor is provided with a plurality of heat dissipation holes (24) connected to the motor (29). The heat dissipation holes (24) are exposed in the air outlet (12) and are distributed on the outer periphery of the central protrusion (21) and in the annular groove (25).

8. The high-speed fan as described in claim 1, characterized in that, The air outlet (12) of the arc-shaped air outlet cover (1) has a serrated edge (11) on its edge. The air guide vane (22) has an upper edge (221) protruding above the fan housing (3) and a side edge (222) protruding from the side of the fan housing (3). The side edge (222) abuts against the inner side of the tip of the serrated edge (11). The side edge (222) forms an arc-shaped contact trajectory with the inner wall of the arc-shaped air outlet cover (1).

9. The high-speed fan as described in claim 1, characterized in that, The outer periphery of the motor assembly (2) is provided with several positioning sleeves (20); The outer periphery of the arc-shaped air outlet cover (1) is provided with several first positioning screw seats (13); The outer periphery of the fan housing (3) is provided with a plurality of second positioning screw seats (31), the second positioning screw seats (31) are inserted into the positioning sleeve (20), and the first positioning screw seat (13) is screwed to the second positioning screw seat (31) protruding from the positioning sleeve (20).

10. The high-speed fan as described in claim 1, characterized in that, The end of the air duct (23) is connected to the air outlet (12).

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