Bladeless fan

Abstract

The utility model relates to the technical field of bladeless fans, and provides a bladeless fan which comprises a first shell, a mixed flow impeller and a second shell. The first shell is provided with a first air duct cavity, the mixed flow impeller is rotatably arranged in the first air duct cavity, the second shell is connected to the first shell, a first part of the second shell is arranged on the periphery of the first shell in a surrounding mode, the first part and the outer wall of the first shell are arranged in a spaced mode, and a second air duct cavity is defined by the inner wall of the second shell and the outer wall of the first shell. One end of the second air duct cavity communicates with the first air duct cavity, and the other end of the second air duct cavity is used for forming an air outlet. According to the bladeless fan provided by the invention, the problem that the use experience of a user becomes poor due to non-uniform air outlet of the bladeless fan can be solved.

Description

[0001] The present application claims priority to the Chinese patent application No. 202423093078.0, filed on December 14, 2024, entitled "A Bladeless Fan", the content of which is incorporated herein by reference in its entirety;

[0002] The present application claims priority to the Chinese patent application No. 202423297651.X, filed on December 27, 2024, entitled "Bladeless Fan", the content of which is incorporated herein by reference in its entirety;

[0003] The present application claims priority to the Chinese patent application No. 202520076459.3, filed on January 13, 2025, entitled "Bladeless Fan", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0004] The present application relates to the technical field of bladeless fan, in particular to a bladeless fan. BACKGROUND

[0005] As a new type of air circulation equipment, the bladeless fan mainly includes an impeller and a flow guide device. The bladeless fan accelerates air through the impeller and the flow guide device and then sprays the air from an air outlet to form a stable air flow.

[0006] When the bladeless fan is running, it will suck air from an air inlet and then spray the air from an air outlet.

[0007] In the related art, the bladeless fan has the problem of uneven air outlet, which can cause poor user experience. SUMMARY

[0008] The present application provides a bladeless fan, which can solve the problem of uneven air outlet of the bladeless fan, which can cause poor user experience.

[0009] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0010] The present application provides a bladeless fan, comprising:

[0011] A first shell having a first air duct cavity;

[0012] A mixed flow impeller rotatably arranged in the first air duct cavity;

[0013] A second shell is connected to the first shell. A first part of the second shell is arranged around an outer periphery of the first shell and is spaced apart from an outer wall of the first shell. An inner wall of the second shell and the outer wall of the first shell enclose a second air duct cavity. One end of the second air duct cavity is in communication with the first air duct cavity. The other end of the second air duct cavity is used to form an air outlet.

[0014] In some embodiments, the mixed flow impeller comprises:

[0015] A hub is rotatably arranged in the first shell and is flared in the axial direction.

[0016] Blades are connected to the hub and extend in a first direction. The first direction intersects the axial direction.

[0017] In some embodiments, one end of the blades extending in the first direction corresponds to a large opening end of the hub. The other end of the blades extending in the opposite direction of the first direction corresponds to a small opening end of the hub. The length of the one end of the blades at the large opening end of the hub is greater than the length of the other end of the blades at the small opening end of the hub.

[0018] In some embodiments, an orthographic projection of the blades in the axial direction is located inside an orthographic projection of the hub in the axial direction. An orthographic projection of the blades in the radial direction is located inside an orthographic projection of the hub in the radial direction.

[0019] In some embodiments, the second shell comprises:

[0020] A first shell part is connected to the first shell. The first shell part comprises a first part and a second part. The first part is substantially arranged on one side of the outer wall of the first shell. The second part is substantially arranged on one side of the inner wall of the first shell.

[0021] A second shell part is located in the first air duct cavity and is connected to the first shell part. The second shell part is arranged around an outer periphery of the mixed flow impeller and is spaced apart from the mixed flow impeller.

[0022] In some embodiments, the second shell part comprises a flow guide surface. The flow guide surface is spaced apart from an outer side surface of the hub. There is a gap between the blades and the flow guide surface.

[0023] In some embodiments, the first shell further has an opening in communication with the first air duct cavity. The opening comprises a first opening area and a second opening area. The second part of the second shell covers the first opening area. The second opening area is used to form an air inlet.

[0024] In some embodiments, the second part extends between the flow guide surface and the hub. There is a gap between the second part and the blades. At least part of the hub extends into the second opening area.

[0025] In some embodiments, further comprising:

[0026] A third shell connected to the first shell, the first shell further having an opening in communication with the first air duct cavity, the third shell being configured to cover part of the opening;

[0027] The third shell and the first shell are spaced apart, and the third shell and the first shell enclose a third air duct cavity, the third air duct cavity being in communication with the first air duct cavity through the opening.

[0028] In some embodiments, further comprising:

[0029] A driving member disposed in the first air duct cavity and connected to the first shell and the mixed-flow impeller, the driving member being configured to drive the mixed-flow impeller to rotate.

[0030] The structure of the bladeless fan, by setting the mixed-flow impeller, the fluid in the first air duct cavity can be accelerated when passing through the mixed-flow impeller. By setting the second shell, the inner wall of the second shell and the outer wall of the first shell enclose the second air duct cavity. By connecting one end of the second air duct cavity with the first air duct cavity, the other end of the second air duct cavity forms an air outlet, the first air duct cavity, the second air duct cavity and the air outlet are sequentially communicated, the second air duct cavity can mix the fluid blown out by the first air duct cavity, and then blow out to the outside through the air outlet, so that the flow rate of the fluid blown out by the air outlet is more uniform.

[0031] Therefore, the bladeless fan provided by the present application can solve the problem of uneven air outlet of the bladeless fan, which leads to poor user experience. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1 The main structure schematic diagram of the bladeless fan provided by the present application;

[0034] Figure 2 The main structure schematic diagram of the bladeless fan provided by the present application; Figure 1

[0035] Figure 3 The main structure schematic diagram of the mixed-flow impeller provided by the present application.

[0036] Explanation of reference signs:

[0037] 100-first shell; 101-first opening area; 102-second opening area; ​

[0038] 200 - mixed flow impeller; 201 - hub; 2011 - large end; 2012 - small end; 202 - blade;

[0039] 300 - second housing; 301 - first housing part; 302 - second housing part; 303 - first portion; 304 - second portion;

[0040] 400 - third housing;

[0041] 500 - driving member;

[0042] 600 - first air duct cavity; 601 - second air duct cavity; 602 - air outlet; 603 - air inlet;

[0043] X - first direction. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application. The embodiments described below and the features in the embodiments can be combined with each other without conflict.

[0045] It should be noted that the bladeless fan refers to a fan without exposed rotating blades.

[0046] In the related art, the impeller of the bladeless fan is located inside the housing of the bladeless fan, and an air inlet and an air outlet are formed on the housing. The air inlet is located at the rear of the housing, and the air outlet is located at the front of the housing. Through the air inlet on the housing, air outside the rear of the housing can be sucked into the inside of the housing through the impeller, and after being accelerated by the high-speed rotating impeller, the air is blown out through the air outlet at the front of the housing.

[0047] It should be noted that the bladeless fan with the above structure has the problem of uneven air outlet.

[0048] Further, the uneven air outlet can be a combination of one or more of uneven air flow, existence of a strong air outlet area, and existence of a weak air outlet area, which is not limited herein. The uneven air outlet of the bladeless fan will result in poor user experience.

[0049] In order to overcome the defects in the prior art, in the bladeless fan provided in the application, by arranging the mixed flow impeller, the fluid in the first air duct cavity can be accelerated by the mixed flow impeller when passing through the mixed flow impeller. By arranging the second shell, the inner wall of the second shell and the outer wall of the first shell form the second air duct cavity. By connecting one end of the second air duct cavity with the first air duct cavity and forming the air outlet at the other end of the second air duct cavity, the first air duct cavity, the second air duct cavity and the air outlet are sequentially communicated, the second air duct cavity can mix the fluid blown out by the first air duct cavity, and then the fluid is blown out to the outside through the air outlet, so that the flow rate of the fluid blown out by the air outlet is more uniform.

[0050] Therefore, the bladeless fan provided in the application can solve the problem that the bladeless fan has uneven air outlet, resulting in poor user experience.

[0051] The content of the application will be described in detail below with reference to the drawings, so that those skilled in the art can more clearly and detailedly understand the content of the application.

[0052] As shown in Figure 1 and Figure 2 The application provides a bladeless fan, which comprises a first shell 100, a mixed flow impeller 200 and a second shell 300. The first shell 100 has a first air duct cavity 600, the mixed flow impeller 200 is rotatably arranged in the first air duct cavity 600, the second shell 300 is connected to the first shell 100, a first part 303 of the second shell 300 is arranged around the outer periphery of the first shell 100 and is spaced apart from the outer wall of the first shell 100, the inner wall of the second shell 300 and the outer wall of the first shell 100 form a second air duct cavity 601, one end of the second air duct cavity 601 is communicated with the first air duct cavity 600, and the other end of the second air duct cavity 601 is used to form an air outlet 602.

[0053] The specific structure of the bladeless fan and various possible embodiments will be described in detail below.

[0054] It should be noted that the bladeless fan provided in the embodiments of the application can be a handheld bladeless fan, or a vertical bladeless fan, or a table type bladeless fan. This is not limited, and can be selected according to actual use requirements.

[0055] It should be noted that the air outlet 602 is arranged around the outer periphery of the first shell 100 and is located between the first shell 100 and the second shell 300.

[0056] It can be understood that the air outlet 602 is arranged around the outer periphery of the first shell 100, which can increase the setting area of the air outlet 602, so that the distribution area of the fluid blown by the bladeless fan is larger, the air outlet 602 is located between the first shell 100 and the second shell 300, which can reduce the difficulty of opening the air outlet 602, and the user cannot directly observe or touch the mixed flow impeller 200 from the outside of the bladeless fan. In the case of increasing the aesthetic appearance of the bladeless fan, the safety performance of the bladeless fan can be improved.

[0057] It should be noted that the fluid flows along the extension direction of the first air duct cavity 600, the second air duct cavity 601 and the air outlet 602 in turn.

[0058] It should be noted that, in the related art, air outside the rear of the shell is sucked into the inside of the shell through the impeller, accelerated through the high-speed rotating impeller, and blown out through the air outlet 602 in front of the shell. The mixed flow impeller 200 can accelerate the fluid in the first air duct cavity 600, and the fluid after acceleration enters the second air duct cavity 601 and is blown out through the air outlet 602, which can make the wind blown by the bladeless fan more stable and the wind speed more uniform.

[0059] It should be noted that the communication mode between the first air duct cavity 600 and the second air duct cavity 601 has many kinds, which will be illustrated in turn below.

[0060] In one possible implementation, the second part 304 of the second shell 300 extends into the first air duct cavity 600 and is spaced apart from the inner wall of the first shell 100 to form a gap, and the first air duct cavity 600 and the second air duct cavity 601 are communicated through the gap.

[0061] It can be understood that by setting the gap, the fluid in the first air duct cavity 600 can flow to the second air duct cavity 601 to realize the communication between the first air duct cavity 600 and the second air duct cavity 601.

[0062] In another possible implementation, a through hole is formed on the first shell 100, one end of the through hole is communicated with the first air duct cavity 600, and the other end of the through hole is communicated with the second air duct cavity 601.

[0063] It can be understood that by setting the through hole, the fluid in the first air duct cavity 600 can flow to the second air duct cavity 601 to realize the communication between the first air duct cavity 600 and the second air duct cavity 601.

[0064] It can be understood that the communication mode between the first air duct cavity 600 and the second air duct cavity 601 is not limited and can be selected according to actual use requirements.

[0065] As shown in Figure 3 The mixed flow impeller 200 provided by the embodiment of the present application comprises a hub 201 and a blade 202. The hub 201 is rotatably arranged in the first shell 100, and the hub 201 is arranged in an expanded manner along the axial direction. The blade 202 is connected to the hub 201, and the blade 202 is arranged in an extending manner along the first direction X, which intersects the axial direction.

[0066] It should be noted that the hub 201 is arranged in an expanded manner along the axial direction, which can help the fluid to enter or exit the mixed flow impeller 200 more smoothly, and reduce the formation of turbulent flow, thereby reducing energy loss and reducing noise generated.

[0067] It can be understood that the blade 202 is arranged in an extending manner along the first direction X, which can make the outflow end of the blade 202 intersect the axial direction, so that the flow direction of the fluid passing through the outflow end of the blade 202 intersects the axial direction, thereby making the flow direction of the fluid blown out by the outflow end of the blade 202 same as the first direction X.

[0068] It should be noted that changing the flow direction of the fluid blown out by the outflow end of the blade 202 can make the fluid flow more smoothly from the first air duct cavity 600 to the second air duct cavity 601.

[0069] In some embodiments, changing the flow direction of the fluid blown out by the outflow end of the blade 202 can reduce the waste of kinetic energy of the fluid, thereby making the fluid can be transported to a farther position.

[0070] It should be noted that the included angle between the first direction X and the axial direction can be any value between 0° and 180°, which is not limited herein and can be selected according to actual use requirements.

[0071] It should be noted that in some embodiments, the first direction X can be a straight line direction, a curved direction or a broken line direction, which is not limited herein and can be selected according to actual use requirements.

[0072] It should be noted that a plurality of blades 202 are arranged, and the plurality of blades 202 are arranged in a spaced manner along the circumferential direction of the hub 201.

[0073] It can be understood that the blade 202 is used to guide and push the flow of the fluid, and increasing the number of blades 202 arranged can improve the mechanical balance of the mixed flow impeller, thereby helping the fluid to flow more stably and uniformly in the first air duct cavity 600.

[0074] It should be noted that the number of blades 202 can be three, four, five, six, seven, eight, nine or other incremental values, which is not limited here and can be selected according to actual use requirements.

[0075] It should be noted that one end of the blade 202 extending along the first direction X corresponds to the large end 2011 of the hub 201, and the other end of the blade 202 extending in the opposite direction of the first direction X corresponds to the small end 2012 of the hub 201. The length of one end of the blade 202 at the large end 2011 of the hub 201 is greater than the length of the other end of the blade 202 at the small end 2012 of the hub 201.

[0076] It can be understood that one end of the blade 202 extending along the first direction X corresponds to the large end 2011 of the hub 201, and the other end of the blade 202 extending in the opposite direction of the first direction X corresponds to the small end 2012 of the hub 201, which can make the blade 202 cover a larger area, thereby making the inlet and outlet areas of the mixed flow impeller 200 larger, thereby improving the use performance of the mixed flow impeller 200. And it can improve the surface utilization rate of the hub 201.

[0077] It can be understood that the length of one end of the blade 202 at the large end 2011 of the hub 201 is greater than the length of the other end of the blade 202 at the small end 2012 of the hub 201, which can make the outlet area of the inlet end of the blade 202 larger, and make the inlet end of the blade 202 more concentrated, thereby making the suction of the inlet end of the blade 202 larger.

[0078] It should be noted that the axial projection of the blade 202 is located inside the axial projection of the hub 201.

[0079] It can be understood that by making the axial projection of the blade 202 inside the axial projection of the hub 201, the space occupation of the blade 202 in the radial direction can be reduced, thereby reducing the overall space occupation of the mixed flow impeller 200, thereby reducing the waste of space inside the first air duct cavity 600.

[0080] It should be noted that the radial projection of the blade 202 is located inside the radial projection of the hub 201.

[0081] It can be understood that by making the radial projection of the blade 202 inside the radial projection of the hub 201, the space occupation of the blade 202 in the axial direction can be reduced, thereby reducing the overall space occupation of the mixed flow impeller 200, thereby reducing the waste of space inside the first air duct cavity 600.

[0082] In the bladeless fan provided by the embodiments of the present application, the outer diameter of the first shell 100 first increases and then decreases along the flow direction of the fluid.

[0083] In the related art, the fluid has a wall attachment effect, that is, when the fluid encounters a convex object surface, the fluid tends to flow along the surface.

[0084] It should be noted that the outer diameter of the first shell 100 first increases and then decreases along the flow direction of the fluid, which has various different setting modes, which will be described in turn.

[0085] In a feasible implementation, the flow direction of the fluid is from the air outlet 602 to the user. Along the direction from the air outlet 602 to the user, the outer diameter of the first shell 100 relatively closer to the air outlet 602 is greater than the outer diameter of the first shell 100 relatively farther away from the air outlet 602. This can make the fluid adhere to the outer wall of the first shell 100 and flow along the extension direction of the outer wall of the first shell 100. As the fluid flows, the outer diameter of the first shell 100 decreases, which can make the fluid blown out of the air outlet 602 move towards the side close to the central axis of the first shell 100, thereby increasing the flow area of the fluid.

[0086] In another feasible implementation, the flow direction of the fluid is from the second air duct cavity 601 to the air outlet 602. Along the direction from the second air duct cavity 601 to the air outlet 602, the outer diameter of the first shell 100 relatively closer to the air outlet 602 is greater than the outer diameter of the first shell 100 relatively farther away from the air outlet 602.

[0087] It can be understood that along the direction from the second air duct cavity 601 to the air outlet 602, the outer diameter of the first shell 100 relatively closer to the air outlet 602 is greater than the outer diameter of the first shell 100 relatively farther away from the air outlet 602. This can make the fluid gradually accelerate from the second air duct cavity 601 to the air outlet 602, so that the fluid blown out of the air outlet 602 has a faster flow rate, thereby making the fluid flowing out of the air outlet 602 have a longer conveying distance.

[0088] In addition, in other feasible implementations, the flow direction of the fluid is from the second air duct cavity 601 to the user. Along the direction from the second air duct cavity 601 to the user, the outer diameter of the first shell 100 first increases and then decreases.

[0089] It can be understood that, along the second air duct cavity 601 to the user direction, the outer diameter of the first shell 100 first increases and then decreases, so that the fluid in the second air duct cavity 601 to the air outlet 602 can gradually accelerate, so that the flow rate of the fluid blown out of the air outlet 602 is faster, thereby making the delivery distance of the fluid flowing out of the air outlet 602 longer. And the fluid can adhere to the outer wall of the first shell 100 and flow along the extension direction of the outer wall of the first shell 100. As the fluid flows, the outer diameter of the first shell 100 decreases, so that the fluid blown out of the air outlet 602 can move towards the side close to the central axis of the first shell 100, so that the surface of the wind blown by the bladeless fan is larger.

[0090] It can be understood that, along the flow direction of the fluid, the outer diameter of the first shell 100 relatively closer to the air outlet 602 is greater than the outer diameter of the first shell 100 relatively farther away from the air outlet 602. The specific arrangement manner is not limited, and can be selected according to actual use requirements.

[0091] The second shell 300 provided by the embodiment of the present application comprises a first shell part 301 and a second shell part 302. The first shell part 301 is connected to the first shell 100. The first shell part 301 comprises a first part 303 and a second part 304. The first part 303 is arranged on one side of the outer wall of the first shell 100. The second part 304 is arranged on one side of the inner wall of the first shell 100. The second shell part 302 is located in the first air duct cavity 600 and connected to the first shell part 301. The second shell part 302 is arranged around the outer periphery of the mixed-flow impeller 200 and spaced apart from the mixed-flow impeller 200.

[0092] It can be understood that, by arranging the first shell part 301 and the second shell part 302, the second shell 300 adopts a split structure, so that the arrangement of the second shell 300 is more flexible. In some embodiments, when the size or type of the mixed-flow impeller 200 needs to be adjusted, the shape of the first shell 100 can not be changed, and the shape and size of the second shell part 302 can be adjusted to adapt to the installation of mixed-flow impellers 200 of different sizes or types.

[0093] It should be noted that, along the extension direction of the first shell part 301, the first part 303 and the second part 304 are arranged at both ends of the first shell part 301. The first part 303 is annularly arranged around the outer periphery of the second part 304.

[0094] Further, the second shell part 302 comprises a flow guide surface, which is spaced apart from the outer side surface of the hub 201, and the gap between the blade 202 and the flow guide surface.

[0095] That is, in the axial direction, the second shell part 302 is spaced apart from the inner bottom wall of the first shell 100, and the blades 202 of the mixed-flow impeller 200 are located in the space.

[0096] It can be understood that, by arranging the flow guide surface, the fluid blown out of the outflow end of the blade 202 can be guided into the first air duct cavity 600. The flow guide surface is spaced apart from the outer side surface of the hub 201, so that the inflow end and the outflow end of the mixed-flow impeller 200 can be arranged separately to reduce the occurrence of backflow of the fluid and turbulence and interference of the fluid inside the impeller. The gap between the blade 202 and the flow guide surface can reduce the collision between the blade 202 and the flow guide surface in the working condition, so as to meet the normal use of the bladeless fan and prolong the service life of the bladeless fan.

[0097] It should be noted that the second shell part 302 is arranged around the outer periphery of the mixed-flow impeller 200, so that the outflow end of the mixed-flow impeller 200 is closer to the inner bottom wall of the first air duct cavity 600, thereby making the distribution of the fluid in the first air duct cavity 600 more uniform.

[0098] It should be noted that the first shell 100 provided by the embodiment of the present application further has an opening communicating with the first air duct cavity 600, the opening including a first opening area 101 and a second opening area 102, the second part 304 of the second shell 300 covering the first opening area 101, and the second opening area 102 being used to form an air inlet 603.

[0099] It can be understood that the first opening area 101 is annularly arranged outside the second opening area 102, the first opening area 101 being used to communicate the first air duct cavity 600 and the second air duct cavity 601, and the second opening area 102 being used to form the air inlet 603, the air inlet 603 being used to communicate the first air duct cavity 600 and the outside of the bladeless fan. Through this structure, the air inlet 603, the first air duct cavity 600, the second air duct cavity 601 and the air outlet 602 can be sequentially communicated.

[0100] It should be noted that the second part 304 extends into the space between the flow guide surface and the hub 201, and the second part 304 has a gap with the blade 202, and at least part of the hub 201 extends into the second opening area 102.

[0101] It can be understood that by extending the second part 304 between the guide surface and the hub 201, the inlet end and the outlet end of the mixed flow impeller 200 can be arranged separately to reduce the occurrence of fluid backflow, turbulence and interference of fluid inside the impeller. By arranging a gap between the second part 304 and the blade 202, the collision between the blade 202 and the second part 304 during operation can be reduced, so that the normal use of the bladeless fan can be met, thereby prolonging the service life of the bladeless fan. By extending at least part of the hub 201 into the second opening area 102, the extension area of the outlet end of the mixed flow impeller 200 can be larger, so that the distribution of fluid in the first air duct cavity 600 is more uniform.

[0102] The embodiment of the present application also provides a bladeless fan, which comprises a third shell 400 connected to the first shell 301, the third shell 400 being used for covering part of the opening, the third shell 400 and the first shell 301 being arranged in a spaced manner, and the third shell 400 and the first shell 301 forming a third air duct cavity.

[0103] It can be understood that the third shell 400 can block the direct contact between the external environment and the mixed flow fan blade, so as to protect the mixed flow fan blade and protect the user. By arranging the third air duct cavity and making the third air duct cavity communicate with the first air duct cavity 600 through the opening, the wind in the external environment can enter the third air duct cavity and then enter the first air duct cavity 600 through the opening, so that the fluid in the external environment can enter the first air duct cavity 600 more effectively.

[0104] The embodiment of the present application also provides a bladeless fan, which comprises a third shell 400 connected to the first shell 301, the third shell 400 being used for covering part of the opening, the third shell 400 and the first shell 301 being arranged in a spaced manner, and the third shell 400 and the first shell 301 forming a third air duct cavity.

[0105] It can be understood that by arranging the driving member 500, the mixed flow impeller 200 can be driven to rotate, so that the fluid in the first air duct cavity 600 can be accelerated by the mixed flow impeller 200, thereby accelerating the fluid in the first air duct cavity 600 to enter the second air duct cavity 601.

[0106] It should be noted that a reference to "one embodiment," "an embodiment," "example embodiment," "some embodiments," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0107] In general, terminology can be understood at least in part from usage in context. For example, terms, such as "one or more" as used herein, can be understood as describing any feature, structure, or characteristic in a singular or multiple sense, depending at least in part on the context in which the term is used. Similarly, terms, such as "a," "an," or "the," again can be understood as describing either a singular or plural number of any feature, structure, or characteristic, depending at least in part on the context in which the term is used.

[0108] It will be readily understood that the terms "on," "above," and "over," as used herein, should not be construed as limiting the location of one element relative to another, but rather should be construed as indicating a relative position at a distance above, below, or in any other direction relative to another element. Further, it will be readily understood that the terms "on," "above," and "over," as used herein, should not be construed as limiting the location of one element relative to another, but rather should be construed as indicating a relative position at a distance above, below, or in any other direction relative to another element.

[0109] Further, spatially relative terms, such as "beneath," "below," "lower," "above," "upper," and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90° or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0110] Finally, it should be noted that the above-described embodiments are merely exemplary of the application and should not be used in a manner to limit the scope of the application. Those skilled in the art will be able to make modifications and / or substitutions for elements disclosed without departing from the scope of the application and it is intended that all such modifications and substitutions be included within the scope of the application.

Claims

1. A bladeless fan, characterized by, The application relates to a mixed-flow fan, which comprises: a first shell (100) having a first air duct cavity (600); a mixed-flow impeller (200) rotatably arranged in the first air duct cavity (600); a second shell (300) connected to the first shell (100), a first part (303) of the second shell (300) being arranged around the outer periphery of the first shell (100) and being spaced apart from the outer wall of the first shell (100), the inner wall of the second shell (300) and the outer wall of the first shell (100) forming a second air duct cavity (601), one end of the second air duct cavity (601) being communicated with the first air duct cavity (600), and the other end of the second air duct cavity (601) being used for forming an air outlet (602).

2. The bladeless fan of claim 1, wherein, The mixed-flow impeller (200) comprises: a hub (201) rotatably arranged in the first shell (100) and being flared along the axial direction; a blade (202) connected to the hub (201) and being arranged to extend along a first direction intersecting the axial direction.

3. The bladeless fan of claim 2, wherein, One end of the blade (202) extending along the first direction corresponds to the large end (2011) of the hub (201), and the other end of the blade (202) extending in the direction opposite to the first direction corresponds to the small end (2012) of the hub (201), the length of the one end of the blade (202) located at the large end (2011) of the hub (201) being greater than the length of the other end of the blade (202) located at the small end (2012) of the hub (201).

4. The bladeless fan of claim 2, wherein, The orthographic projection of the blade (202) along the axial direction is located inside the orthographic projection of the hub (201) along the axial direction, and the orthographic projection of the blade (202) along the radial direction is located inside the orthographic projection of the hub (201) along the radial direction.

5. The bladeless fan of claim 2, wherein, The second shell (300) comprises: a first shell part (301) connected to the first shell (100), the first shell part (301) comprising the first part (303) and a second part (304), the first part (303) being arranged on one side of the outer wall of the first shell (100), and the second part (304) being arranged on one side of the inner wall of the first shell (100); a second shell part (302) located in the first air duct cavity (600) and connected to the first shell part (301), the second shell part (302) being arranged around the outer periphery of the mixed-flow impeller (200) and being spaced apart from the mixed-flow impeller (200).

6. The bladeless fan of claim 5, wherein, The second shell part (302) comprises a flow guide surface, the flow guide surface being spaced apart from the outer side surface of the hub (201), and the blade (202) and the flow guide surface have a gap therebetween.

7. The bladeless fan of claim 6, wherein, The first shell (100) further has an opening in communication with the first air duct cavity (600), the opening comprising a first opening area (101) and a second opening area (102), the second part (304) of the second shell (300) covering the first opening area (101), and the second opening area (102) being used to form an air inlet (603).

8. The bladeless fan of claim 7, wherein, The second part (304) extends between the flow guide surface and the hub (201), and a gap is formed between the second part (304) and the blades (202); at least part of the hub (201) extends into the second opening area (102).

9. The bladeless fan of claim 8, wherein, Further comprising: A third shell (400) connected to the first shell (301), the first shell (100) further having an opening in communication with the first air duct cavity (600), the third shell (400) being used to cover part of the opening; The third shell (400) and the first shell (301) are arranged in a spaced manner, and the third shell (400) and the first shell (301) enclose a third air duct cavity, the third air duct cavity being in communication with the first air duct cavity (600) through the opening.

10. The bladeless fan of claim 1, wherein, Further comprising: A driving member (500) arranged in the first air duct cavity (600) and connected to the first shell (100) and the mixed-flow impeller (200), the driving member (500) being used to drive the mixed-flow impeller (200) to rotate.

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