A high speed fan

Abstract

The utility model provides a kind of high-speed fan, including: motor assembly;Fan shell, sleeve joint motor assembly, the direction of the air flow produced by the outer periphery of cooperation motor assembly is formed into air inlet end and air outlet end respectively, the surface of motor assembly located at air outlet end is equipped with several self central outward helical extension's air deflector;Annular air inlet cover, connect the air inlet end of fan shell;And arc air outlet cover, connect the air outlet end of fan shell, the outer wall of fan shell, the inner wall of arc air outlet cover is divided by air deflector and is formed into several helical air ducts arranged in ring, air flow produced by motor assembly is shunted as sub-air flow by helical air duct, and sub-air flow is independently emitted outward from the air outlet opening in the center of arc air outlet cover.The utility model can improve air duct structure, effectively increase the air output of fan under the premise of constant motor power, and improve the effect of silence.

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 generated by the motor 92 into several sub-airflows. The sub-airflows converge before the air outlet 94 and are then emitted outward.

[0004] However, due to the limitations of existing motor technology, if a high-power motor is used in the bladeless fan with the above structure, although the air speed can be increased, the noise will increase significantly; if a low-power motor is used, although the noise reduction effect is excellent, the air force will be weakened. This creates a technical contradiction between air force and quietness.

[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] Motor assembly;

[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 respectively along the direction of airflow. The surface of the motor assembly located at the air outlet is provided with a number of air guide vanes that spirally extend outward from the center.

[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 spiral air channels arranged in a ring. The air flow generated by the motor assembly is split into sub-air flows through the spiral air channels. The sub-air flows are independently emitted outward from the air outlet opening in the center of the arc-shaped air outlet shroud.

[0012] Preferably, the air outlet edge of the arc-shaped air outlet hood has a serrated edge.

[0013] Preferably, the air guide vane has an upper edge protruding above the fan housing and a side edge protruding to the side of the fan housing, the side edges respectively abutting the inner side of the tip of the serrated edge.

[0014] Preferably, the side edge forms an arc-shaped contact trajectory with the inner wall of the arc-shaped air outlet shroud.

[0015] Preferably, the motor assembly includes:

[0016] Electric motor;

[0017] The motor is enclosed by the upper and lower housings; and

[0018] An impeller is located on the side of the lower housing of the motor away from the motor. The impeller is rotated by the motor to generate airflow.

[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 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.

[0023] Preferably, the upper housing of the motor is provided with a plurality of heat dissipation holes connected to the motor, and the heat dissipation holes are exposed in the air outlet.

[0024] Preferably, the end of the spiral duct is connected to the air outlet.

[0025] 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.

[0026] Preferably, the surface of the upper housing of the motor is further provided with an annular groove surrounding the central protrusion. The annular groove is exposed in the air outlet. The annular groove changes the direction of the return airflow entering the air outlet so that the return airflow and the sub-airflow merge in the same direction.

[0027] Preferably, the heat dissipation holes are distributed on the outer periphery of the central protrusion and within the annular groove.

[0028] 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

[0029] 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.

[0030] Figure 1 This is a schematic diagram of the structure of a bladeless fan in the existing technology.

[0031] Figure 2 This is a perspective view of the high-speed fan of this utility model.

[0032] Figure 3 This is a side view of the high-speed fan of this utility model.

[0033] Figure 4 This is a top view of the high-speed fan of this utility model.

[0034] Figure 5 This is a cross-sectional view of the high-speed fan of this utility model.

[0035] Figure 6 This is a perspective view of the high-speed fan of this utility model after removing the arc-shaped air outlet cover.

[0036] Figure 7 This is a side view of the high-speed fan of this utility model after removing the arc-shaped air outlet cover.

[0037] Figure 8 This is a top view of the high-speed fan of this utility model after removing the arc-shaped air outlet cover.

[0038] Figure 9 This is a cross-sectional view of the high-speed fan of this utility model after removing the arc-shaped air outlet cover.

[0039] Figure 10 This is a perspective view of the arc-shaped air outlet cover of the high-speed fan of this utility model.

[0040] Figure 11 This is a side view of the arc-shaped air outlet shroud of the high-speed fan of this utility model.

[0041] Figure 12 This is a top view of the arc-shaped air outlet shroud of the high-speed fan of this utility model.

[0042] Figure 13 This is a schematic diagram of the air duct in one working state of the high-speed fan of this utility model.

[0043] Figure 14 This is a schematic diagram of the air duct in another working state of the high-speed fan of this utility model.

[0044] Figure Labels

[0045] 1. Arc-shaped air vent

[0046] 11. Serrated edges

[0047] 12 air outlets

[0048] 13 First positioning screw seat

[0049] 2 Motor assembly

[0050] 20 positioning sleeves

[0051] 21. Central protrusion

[0052] 22 air guide vanes

[0053] 221 Upper edge

[0054] 222 Side edge

[0055] 23 Spiral air duct

[0056] 24 ventilation holes

[0057] 25 Annular groove

[0058] 26 Motor housing

[0059] 27. Lower casing of the motor

[0060] 28 Impeller

[0061] 29 Electric Motor

[0062] 3. Fan casing

[0063] 31 Second positioning screw seat

[0064] 4. Air Inlet Cover

[0065] 9. Traditional fans

[0066] 91. Outer shell

[0067] 92 motor

[0068] 93 Air Inlet

[0069] 94 Air vent

[0070] 95 air duct

[0071] 96 Plate-shaped air guide vanes Detailed Implementation

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] Figure 2This is a perspective view of the high-speed fan of this utility model. Figure 3 This is a side view of the high-speed fan of this utility model. Figure 4 This is a top view of the high-speed fan of this utility model. Figure 5 This is a cross-sectional view of the high-speed fan of this utility model. Figures 2 to 5 As 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 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 airflow generation. The surface of the motor assembly 2 at the air outlet end is provided with several guide vanes 22 spirally extending outward from the center. 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 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 shroud 1 are divided by the guide vanes 22 to form several annularly arranged spiral air channels 23. The airflow generated by the motor assembly 2 is split into sub-airflows through the spiral air channels 23, and the sub-airflows are independently emitted outward from the air outlet opening 12 in the center of the arc-shaped air outlet shroud 1. The spiral air duct 23 in this invention differs from the straight air ducts of existing technologies. Instead, the cross-sectional shape of the air duct rotates along its extension direction, thereby better guiding the high-speed airflow generated by the fan outward. This invention significantly enhances the airflow by incorporating the spiral air duct 23 within the confined space of the fan, working in conjunction with the motor impeller to generate airflow. Furthermore, it reduces airflow impact within the air duct, minimizing airflow attenuation and related noise. This breakthrough achieves a significant improvement in fan performance and optimizes the overall performance of the bladeless fan using this invention, all without increasing motor power while simultaneously increasing airflow and reducing overall noise.

[0083] In a preferred embodiment, the air outlet 12 of the arc-shaped air outlet shroud 1 is provided with a serrated edge 11. The serrated edge 11 is equivalent to being set at the end of the spiral air duct 23, thereby effectively reducing wind noise, but not limited thereto.

[0084] In a preferred embodiment, 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. The side edges 222 form an arc-shaped contact trajectory with the inner wall of the arc-shaped air outlet shroud 1, thereby ensuring that the end of the spiral air duct 23 can be directly connected to the air outlet 12 (the air outlet 12 is also divided by the spiral air duct 23). Each sub-airflow leaving the spiral air duct 23 does not need to be re-converged inside the machine body, but is directly emitted outward from the air outlet 12 independently, thereby reducing noise, but not limited thereto.

[0085] Figure 6This is a perspective view of the high-speed fan of this utility model after removing the arc-shaped air outlet cover. Figure 7 This is a side view of the high-speed fan of this utility model after removing the arc-shaped air outlet cover. Figure 8 This is a top view of the high-speed fan of this utility model after removing the arc-shaped air outlet cover. Figure 9 This is a cross-sectional view of the high-speed fan of this utility model after removing the arc-shaped air outlet cover. Figures 6 to 9 As shown, in a preferred embodiment, the motor assembly 2 of this invention includes: a motor 29, an upper motor housing 26, a lower motor housing 27, and an impeller 28. The upper motor housing 26 and the lower motor housing 27 enclose the motor 29. The impeller 28 is disposed on the side of the lower motor housing 27 opposite to the motor 29. The impeller 28 is rotated by the motor 29 to generate airflow, but is not limited thereto.

[0086] 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, but is not limited thereto.

[0087] In a preferred embodiment, the motor housing 26 is provided with a plurality of heat dissipation holes 24 connected to the motor 29, and the heat dissipation holes 24 are exposed in the air outlet 12, but are not limited thereto.

[0088] 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.

[0089] In a preferred embodiment, the surface of the motor housing 26 is further provided with an annular groove 25 surrounding the central protrusion 21. The annular groove 25 is exposed in the air outlet 12. The annular groove 25 changes the direction of the return airflow entering the air outlet 12 so that the return airflow and the sub-airflow merge in the same direction, but is not limited thereto.

[0090] In a preferred embodiment, the heat dissipation holes 24 are distributed around the outer periphery of the central protrusion 21 and within the annular groove 25, but are not limited thereto.

[0091] Figure 10 This is a perspective view of the arc-shaped air outlet cover of the high-speed fan of this utility model. Figure 11 This is a side view of the arc-shaped air outlet shroud of the high-speed fan of this utility model. Figure 12 This is a top view of the arc-shaped air outlet shroud of the high-speed fan of this utility model. Figures 10 to 12As shown, 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. This improves the alignment accuracy and connection strength of the arc-shaped air outlet shroud 1, the fan housing 3, and the motor assembly 2, and reduces the noise generated by the shaking between the arc-shaped air outlet shroud 1, the fan housing 3, and the motor assembly 2, but is not limited thereto.

[0092] Figure 13 This is a schematic diagram of the air duct in one working state of the high-speed fan of this utility model. Figure 13 As shown, in the high-speed fan of this invention, the annular air inlet shroud 4 is connected to the air inlet end of the fan housing 3. The surface of the motor assembly 2 located at the air outlet end is provided with several guide vanes 22 extending spirally outward from the center. The arc-shaped air outlet shroud 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 shroud 1 are divided by the guide vanes 22 to form several spiral air channels 23 arranged in a ring. The impeller 28 is rotated by the motor 29 to generate an airflow L1. When the high-speed fan of this invention is working, the airflow L1 generated by the motor assembly 2 is divided into several sub-airflows L2 through the spiral air channels 23. The sub-airflows L2 are independently emitted outward from the air outlet opening 12 in the center of the arc-shaped air outlet shroud 1. The edge of the air outlet opening 12 of the arc-shaped air outlet shroud 1 is provided with a serrated edge 11, which is equivalent to being located at the end of the spiral air channel 23. 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 edges 222 respectively abut against the inner side of the tip of the serrated edge 11. The side edges 222 form an arc-shaped contact trajectory with the inner wall of the arc-shaped air outlet shroud 1, thereby ensuring that the end of the spiral duct 23 can be directly connected to the air outlet 12. The sub-airflow L2 leaving the spiral duct 23 does not need to be collected, but is directly and independently emitted outward from the air outlet 12 (the sub-airflow L2 emitted from the spiral duct 23 will not re-merge in the annular air inlet shroud 4), thereby reducing noise. Based on the combined effect of the spiral duct 23 and the serrated edge 11 provided at the tail of the spiral duct 23 (see... Figure 1 Compared with the combination of linear air duct and plate-shaped air guide in the prior art, this utility model can greatly enhance the air volume and reduce the impact of airflow inside the air duct, reduce the weakening of airflow by the air duct and related noise, and achieve 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 utility model.

[0093] Figure 14This 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 14 As shown, due to the structural improvements of the high-speed fan in this invention, the sub-airflow L2 is mainly emitted outward from the outer end of the spiral duct opening, which is opposite to the center. Because the sub-airflow L2 is strong, it creates an inward-drawing return airflow L3 near the center at the spiral duct opening (equivalent to each spiral duct having a positive pressure at the outer end in the radial direction and a negative pressure at the inner end near the center). Due to the continuous emission of the sub-airflow L2, the increased intake of return airflow L3 flows outward along the upper surface of L3 until it accumulates at the end of the spiral duct. This return airflow L3, almost opposite in direction to the sub-airflow L2, forms an air wall, resulting in airflow loss and generating additional noise. To further reduce the negative impact of the return airflow L3, this invention... Figure 12 Based on the previous embodiment, an improvement is made: a central protrusion 21 is provided in the center of the motor housing 26, and a 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. The surface of the motor housing 26 is also provided with an annular groove 25 surrounding the central protrusion 21, which protrudes from the air outlet 12. The bottom of the annular groove 25 has a circular arc cross-section, causing the annular groove 25 to change the direction of the return airflow L3 entering the air outlet 12, so that the bent return airflow merges with the sub-airflow L2 in a forward direction. Heat dissipation holes 24 are distributed on the outer periphery of 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 a forward direction, then is emitted outward.

[0094] In another variation, it can also be found in this utility model. Figure 12 Based on the previous embodiment, an improvement is made: 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. The surface of the motor housing 26 is also provided with an annular groove 25 surrounding the central protrusion 21. The annular groove 25 is exposed at the air outlet 12. The annular groove 25 has a large depth, which blocks the return airflow L3 from flowing along the surface of the motor housing 26 towards the sub-airflow L2, but is not limited thereto.

[0095] 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.

[0096] 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: Motor assembly (2); 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 air flow. The surface of the motor assembly (2) located at the air outlet is provided with a number of air guide vanes (22) spirally extending from the center outward. 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 spiral air channels (23) arranged in a ring. The air flow generated by the motor assembly (2) is split into sub-air flows through the spiral air channels (23). The sub-air flows are independently emitted outward from the air outlet opening (12) in the center of the arc-shaped air outlet cover (1).

2. 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) at its edge.

3. The high-speed fan as described in claim 2, characterized in that, 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) abutting the inner side of the tip of the serrated edge (11).

4. The high-speed fan as described in claim 3, characterized in that, The side edge (222) forms an arc-shaped contact trajectory with the inner wall of the arc-shaped air outlet hood (1).

5. The high-speed fan as described in claim 1, characterized in that, The motor assembly (2) includes: Electric motor (29); The upper motor housing (26) and the lower motor housing (27) enclose the motor (29); and An impeller (28) is disposed on the side of the lower housing (27) of the motor away from the motor (29). The impeller (28) is rotated by the motor (29) to generate airflow.

6. The high-speed fan as described in claim 5, 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).

7. The high-speed fan as described in claim 5, 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).

8. The high-speed fan as described in claim 5, 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), and the heat dissipation holes (24) are exposed in the air outlet (12).

9. The high-speed fan as described in claim 5, 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).

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

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