A bladeless fan

Abstract

The application provides a bladeless fan, comprising: a shell provided with an air inlet and an air outlet which are in communication with the inside of the shell; and a fan assembly accommodated in the shell; wherein the air outlet is arranged in the middle region between the front end and the rear end of the shell. By arranging the air outlet in the middle region between the front end and the rear end of the shell, the air outlet direction of the fan assembly is changed, and the air inlet and air outlet of the fan assembly are improved.

Description

Technical Field

[0001] This application relates to the field of fan technology, specifically to a bladeless fan. Background Technology

[0002] In existing fans, since the air intake and exhaust of a fan are determined by its type, generally speaking, one type of fan corresponds to one type of airflow. For example, an axial fan has axial air intake and axial air exhaust, a diagonal fan has axial air intake and diagonal air exhaust, and a centrifugal fan has axial air intake and radial air exhaust.

[0003] However, each type of fan has its own advantages and disadvantages in terms of air intake and exhaust. How to improve the air intake and exhaust of a fan is a problem that urgently needs to be solved. Summary of the Invention

[0004] In view of this, this application provides a bladeless fan that improves the air outlet effect by changing the air outlet position of the fan assembly by placing the air outlet in the middle area between the front and rear ends of the housing.

[0005] This application provides a bladeless fan, comprising: a housing having an air inlet and an air outlet communicating with the interior of the housing; and a fan assembly housed within the housing; wherein the air outlet is located in the middle region between the front and rear ends of the housing.

[0006] Furthermore, the fan assembly includes a motor and a centrifugal axial flow conversion assembly. The centrifugal axial flow conversion assembly includes a hub and a plurality of blades. The motor is housed on one side of the hub, and the plurality of blades are spaced apart and connected to the radial outer side of the hub.

[0007] Furthermore, the outer shell includes a front cover and a rear cover. The front cover includes a connected first arc portion and a second arc portion, and the rear cover includes a connected third arc portion and a fourth arc portion. The first arc portion, the second arc portion, the third arc portion, and the fourth arc portion are all curved and extended.

[0008] Furthermore, the second arc portion and the third arc portion are spaced apart, at least a portion of the second arc portion is blocked from the outside by the third arc portion, and the air outlet is located between the second arc portion and the third arc portion.

[0009] Furthermore, the housing also includes a plurality of guide strips, which connect the second arc portion and the third arc portion.

[0010] Furthermore, the third arc portion is positioned forward, the fourth arc portion extends and bends from the third arc portion, the end of the fourth arc portion is positioned forward, and the end of the fourth arc portion forms the air inlet.

[0011] Furthermore, the housing also includes a rear stop, which is fixed to the fourth arc portion and has a gap between it and the fourth arc portion, and the rear stop completely blocks the air inlet from the rear.

[0012] Furthermore, the first arc portion bends forward and extends forward, and the first arc portion is radially reduced from back to front. The third arc portion bends forward and the third arc portion is radially increased from back to front. The airflow flows into the air inlet from the gap between the rear baffle and the fourth arc portion, then flows into the fan assembly from the air inlet, then flows out of the fan assembly and flows to the air outlet, and then flows forward from the air outlet via the outer surface of the first arc portion.

[0013] Furthermore, it also includes a support, which is connected to the outside of the housing, and a rechargeable battery is provided inside the support.

[0014] Furthermore, it also includes a rechargeable battery, which is disposed within the housing and on the front side of the fan assembly.

[0015] Compared with the prior art, the bladeless fan of this application has the following beneficial effects: by setting the air outlet in the middle area between the front end and the rear end of the housing, the air outlet direction of the fan assembly is changed, thereby improving the air intake and exhaust of the fan assembly. Attached Figure Description

[0016] Figure 1 This is a perspective view of the bladeless fan of this application from one direction;

[0017] Figure 2 This is a perspective view of the bladeless fan of this application from another direction;

[0018] Figure 3 This is an exploded view of the bladeless fan of this application from one direction;

[0019] Figure 4 This is a perspective view of the bladeless fan of this application from another direction;

[0020] Figure 5 This is a cross-sectional view of the bladeless fan of this application;

[0021] Figure 6 yes Figure 5 A magnified view of the upper middle section;

[0022] Figure 7 yes Figure 5 Enlarged view of section A;

[0023] Figure 8 This is a perspective view of the centrifugal axial flow conversion assembly of this application from one direction;

[0024] Figure 9 This is a perspective view of the centrifugal axial flow conversion assembly of this application from another direction;

[0025] Figure 10 This is a perspective view of another embodiment of the bladeless fan of this application;

[0026] Figure 11 yes Figure 10 Cross-sectional view of a bladeless fan;

[0027] Figure 12 This is a perspective view of another embodiment of the bladeless fan of this application;

[0028] Figure 13 yes Figure 12 A cross-sectional view of a bladeless fan. Detailed Implementation

[0029] To facilitate a better understanding of the purpose, structure, features, and effects of this application, the bladeless fan of this application will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0030] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intervening component present.

[0031] In this application, the use of terms such as "first" and "second" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0032] In the description of this application, the terms "front", "rear", "left", "right", "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] like Figures 1 to 5 The diagram shows a schematic of a bladeless fan. The bladeless fan includes a housing 1 and a fan assembly. The housing 1 has an air inlet 16 and an air outlet 17 communicating with the interior of the housing 1. The fan assembly is housed within the housing 1. The air outlet 17 is located in the middle region between the front and rear ends of the housing 1. By placing the air outlet 17 in the middle region between the front and rear ends of the housing 1, the airflow direction of the fan assembly is changed, improving the airflow intake and exhaust of the fan assembly.

[0034] like Figure 3 , Figure 5 , Figure 8 and Figure 9 As shown, in one embodiment, the fan assembly includes a motor 2 and a centrifugal axial flow conversion assembly 300. The centrifugal axial flow conversion assembly 300 includes a hub 31 and a plurality of blades 32. The motor 2 is housed on one side of the hub 31, and the plurality of blades 32 are spaced apart and connected to the radially outer side of the hub 31. Each blade 32 includes a blade root 321 connected to the hub 31, a blade tip 322 opposite to the blade root 321, a blade leading edge 323 connecting the blade root 321 and the blade tip 322 and located at the front end, and a blade trailing edge 324 connecting the blade root 321 and the blade tip 322 and located at the rear end. In this embodiment, the axial projections of the blade leading edge 323 and the blade trailing edge 324 of each blade 32 overlap, and the axial projection at any position between the blade leading edge 323 and the blade trailing edge 324 of each blade 32 overlaps with the axial projections of the blade leading edge 323 and the blade trailing edge 324. In other words, during the extension from the leaf root 321 to the leaf tip 322 of the blade 32, the leading edge 323 and the trailing edge 324 of the blade do not undergo relative deformation or torsion, and the cross-sectional position between the leading edge 323 and the trailing edge 324 also does not undergo deformation or torsion relative to the leading edge 323 and the trailing edge 324. Of course, in other embodiments, the leading edge 323 and the trailing edge 324 may not undergo relative deformation or torsion, but the cross-sectional position between the leading edge 323 and the trailing edge 324 may undergo deformation or torsion relative to the leading edge 323 and the trailing edge 324. In other embodiments, the axial projections of the leading edge 323 and the trailing edge 324 of each blade 32 may not completely overlap, or may not overlap at all; that is, during the extension from the leaf root 321 to the leaf tip 322 of the blade 32, the leading edge 323 undergoes torsional deformation relative to the trailing edge 324.

[0035] In this embodiment, multiple blades 32 are directly connected to the radially outer side of the hub 31, and each blade 32 extends radially outward from the hub 31. Each blade 32 includes a first bend 325 and a second bend 326. The first bend 325 connects the hub 31 and the second bend 326. The first bend 325 and the second bend 326 have opposite bending directions, and the length of the first bend 325 is greater than the length of the second bend 326. Further, the trailing edge 324 of the first bend 325 includes a first flat portion 3251 and a first inclined portion 3252, and the trailing edge 324 of the second bend 326 includes a second flat portion 3261. The first flat portion 3251 is connected to a rearward position of the hub 31, and the first flat portion 3251 extends radially straight outward, i.e., from... Figures 5 to 7From the cross-sectional view, the first flat portion 3251 is not inclined forward or backward. The first inclined portion 3252 extends inclinedly from the first flat portion 3251 toward the second flat portion 3261, that is, from... Figures 5 to 7 In the cross-sectional view, the first inclined portion 3252 extends rearward and outward from the first flat portion 3251, and the rear end of the first inclined portion 3252 extends rearward beyond the rear end of the hub 31. The second flat portion 3261 extends radially straight outward, that is, from... Figures 5 to 7 From the cross-sectional view, the second flat portion 3261 is not tilted forward or backward. The first flat portion 3251, the first inclined portion 3252, and the second flat portion 3261 are smoothly connected by a chamfer. In other embodiments, the first flat portion 3251, the first inclined portion 3252, and the second flat portion 3261 may not have a chamfer, as long as airflow can be achieved. The flat and inclined portions of the blade trailing edge 324 of the blade 32 can be arranged such that they first tilt backward and extend outward radially from the hub 31, and then extend straight outward, or they can be arranged such that they tilt backward and extend outward radially from the hub 31.

[0036] Furthermore, the leading edge 323 of the first bend 325 includes a second inclined portion (not identified, the same below), and the leading edge 323 of the second bend 326 includes a third flat portion (not identified, the same below). The second inclined portion connects to the forward position of the hub 31, and the second inclined portion is inclined forward and extends outward, that is, from... Figures 5 to 7 In the cross-sectional view, the second inclined portion extends forward from the hub 31, and the front end of the second inclined portion extends forward beyond the front end of the hub 31. The third flat portion extends radially straight outward, that is, from... Figures 5 to 7 From the cross-sectional view, the third flat portion does not tilt forward or backward. The second inclined portion and the third flat portion are smoothly connected by a chamfer. In other embodiments, the second inclined portion and the third flat portion may not have a chamfer, as long as airflow can be achieved. It should be understood that the flat and inclined portions of the leading edge 323 of the blade 32 can be arranged by first extending straight outward from the hub 31, then tilting forward and outward, and finally extending straight outward again; or they can be arranged by tilting forward and outward radially from the hub 31.

[0037] It should be understood that an airflow channel is formed between the plurality of blades 32, and an air intake (unmarked, the same below) is formed on one side of the trailing edge 324 of the plurality of blades 32. The area of ​​the air intake can even cover the central hub 31 area, thereby forming a large-area air intake. An air outlet (unmarked, the same below) is formed on one side of the tip 322 of the plurality of blades 32, or further, the air outlet is formed at the position of the tip 322 of the plurality of blades 32 near the leading edge 323 of the plurality of blades 32, or the air outlet is formed at the position of the leading edge 323 of the plurality of blades 32 near the tip 322 of the blade. In short, the air outlet is located near the position where the tip 322 of the blade and the leading edge 323 of the blade connect.

[0038] It should be understood that this is one form of each blade 32. In other embodiments, it may include only one bend or multiple bends. Alternatively, the fan assembly may have two or more different forms of blades 32, and this embodiment is not a limitation. In other embodiments, the multiple blades 32 and the hub 31 may be indirectly connected, that is, a connecting member may be provided between the multiple blades 32 and the hub 31. This is not limited to the examples provided, as long as airflow can be achieved.

[0039] like Figures 5 to 9 As shown, the centrifugal axial flow conversion assembly 300 further includes a plate portion 33 and a ring portion 34. The plate portion 33 is disposed on the leading edge 323 of the plurality of blades 32, and the plate portion 33 connects to the leading edge 323 of the plurality of blades 32 from the hub 31. In this embodiment, the end of the leading edge 323 of each blade 32 near the blade tip 322 extends beyond the plate portion 33 and is exposed forward. In other embodiments, the entire leading edge 323 of each blade 32 may be covered by the plate portion 33, or the plate portion 33 may not cover the portion of the leading edge 323 near the hub 31, but this is not a limitation. The ring portion 34 is disposed on the trailing edge 324 of the plurality of blades 32, and the ring portion 34 is not connected to the hub 31, but only to the portion of the trailing edge 324 of the blade 32 near the blade tip 322.

[0040] like Figures 5 to 9 As shown, in one embodiment, the hub 31 is open at the front and closed at the rear. The motor 2 is housed on one side of the open side of the hub 31, and the open side of the hub 31 faces away from the air intake, thus preventing dust and impurities from entering the motor 2. Of course, the hub 31 may also be open on both the front and rear sides, and the motor 2 may include a housing that blocks dust and impurities from entering the motor 2 from the rear.

[0041] like Figures 3 to 6As shown, the motor 2 includes a stator assembly 21 and a rotor assembly 22. The rotor assembly 22 includes a shaft 221, a bearing 222, and a magnetic ring 223. The housing 1 has a shaft sleeve 4 formed from front to back, or the shaft sleeve 4 is fixed thereon. One end of the shaft 221 is inserted and fixed inside the shaft sleeve 4 through the bearing 222, and the other end of the shaft 221 is inserted and fixed inside the hub 31. The stator assembly 21 is sleeved on the radially outer side of the shaft sleeve 4, and the magnetic ring 223 is fixed on the radially inner side of the hub 31, and the magnetic ring 223 is located on the radially outer side of the stator assembly 21.

[0042] like Figures 3 to 6 As shown, in one embodiment, the outer casing 1 includes a front cover 11 and a rear cover 12. The front cover 11 includes a connected first arc portion 111 and a second arc portion 112, which are generally located radially outward of the centrifugal axial flow conversion assembly 300. The rear cover 12 includes a connected third arc portion 121 and a fourth arc portion 122, which are generally located radially outward and rearward of the centrifugal axial flow conversion assembly 300. The first arc portion 111, the second arc portion 112, the third arc portion 121, and the fourth arc portion 122 all extend in a curved manner, and from... Figures 5 to 7 As seen in the cross-sectional view, the first arc portion 111, the second arc portion 112, the third arc portion 121, and the fourth arc portion 122 are arc-shaped.

[0043] In this embodiment, the second arc portion 112 and the third arc portion 121 are spaced apart, with at least a portion of the second arc portion 112 being externally blocked by the third arc portion 121. The air outlet 17 is located between the second arc portion 112 and the third arc portion 121. Because the second arc portion 112 and the third arc portion 121 have overlapping portions radially, and the third arc portion 121 externally blocks a portion of the second arc portion 112, the air outlet 17 has a certain depth, and the arc shape prevents the user from observing the centrifugal axial flow conversion assembly 300 through the air outlet 17.

[0044] like Figures 3 to 6As shown, in one embodiment, the outer casing 1 further includes a plurality of guide strips 15, which connect the second arc portion 112 and the third arc portion 121. It should be understood that when the second arc portion 112 and the third arc portion 121 are made of thin materials, they may partially overlap. The plurality of guide strips 15 are disposed between the second arc portion 112 and the third arc portion 121, and extend the second arc portion 112 and the third arc portion 121 to ensure the opening of the air outlet 17. The plurality of guide strips 15 may be integrally formed from the second arc portion 112, integrally formed from the third arc portion 121, or formed separately.

[0045] like Figures 3 to 6 As shown, in one embodiment, the third arc portion 121 is positioned forward, and the fourth arc portion 122 extends and curves from the third arc portion 121, with its end facing forward, forming the air inlet 16. The housing 1 also includes a rear stop 14, which is fixed to the fourth arc portion 122, and a gap exists between the rear stop 14 and the fourth arc portion 122. The rear stop 14 completely obstructs the air inlet 16 from the rear, and also partially obstructs the fourth arc portion 122 from the rear, thus preventing the user from observing the centrifugal axial flow conversion assembly 300 from the air inlet 16.

[0046] like Figures 3 to 6 As shown, in one embodiment, the first arc portion 111 bends forward and extends forward, and the first arc portion 111 is radially reduced from back to front. The third arc portion 121 bends forward and the third arc portion 121 is radially increased from back to front. Airflow flows into the air inlet 16 from the gap between the rear baffle 14 and the fourth arc portion 122, then flows into the air intake of the centrifugal axial flow conversion assembly 300 from the air inlet 16, then flows out from the air outlet of the centrifugal axial flow conversion assembly 300 and flows to the air outlet 17, and finally flows forward from the air outlet 17 via the outer surface of the first arc portion 111.

[0047] In this embodiment, a first guide section 113 is provided on the inner side of the first arc portion 111. It should be understood that the centrifugal axial flow conversion component 300 is a centrifugal fan with a single-sided air intake having the air inlet on one side. However, after the air generated by the centrifugal axial flow conversion component 300 flows out from the air outlet, it can flow in a spiral backward direction through the arc-shaped guiding effect of the inner side of the first guide section 113, the inner side of the first arc portion 111, and the inner side of the second arc portion 112.

[0048] like Figures 3 to 6As shown, in one embodiment, a second guide portion 114 is provided at the end of the second arc portion 112. The second guide portion 114 extends forward and outward from the second arc portion 112. A third guide portion 123 is provided on the inner side of the fourth arc portion 122. The third guide portion 123 extends forward and inward. A vent 18 is formed between the second guide portion 114 and the third guide portion 123, and the vent 18 communicates with the air outlet 17. The airflow generated by the centrifugal-axial flow conversion assembly 300 flows out of the air outlet and spirals backward through the arc-shaped guiding action of the inner side of the first guide section 113, the inner side of the first arc section 111, and the inner side of the second arc section 112; it then flows to the ventilation opening 18 through the guiding action of the second guide section 114 and the third guide section 123; next, it flows to the air outlet 17 through the arc-shaped guiding action of the outer side of the second arc section 112, the inner side of the second guide section 114, the inner side of the fourth arc section 122, and the inner side of the third arc section 121; finally, it flows forward towards the user through the arc-shaped guiding action of the outer side of the first arc section 111. To coordinate with the spiral airflow, the multiple guide strips 15 also extend spirally from back to front, then extend straight forward, thereby guiding the spiral airflow into a straight forward airflow, converting the centrifugal wind into axial wind.

[0049] It should be understood that airflow motion has a wall-attaching effect. Figure 6 The central arrow roughly indicates the airflow direction. Through the guiding function of the first arc portion 111, the second arc portion 112, the third arc portion 121, the fourth arc portion 122, the first guide portion 113, the second guide portion 114, and the third guide portion 123 provided in the outer shell 1, the airflow direction of the centrifugal-axial flow conversion component 300 is changed, transforming the originally formed radial airflow into a forward-flowing axial airflow. Thus, while setting up a centrifugal fan, one can enjoy axial airflow, maximizing the performance of a bladeless fan, and the airflow effect is very good.

[0050] It should be understood that, in one embodiment, to allow the air to blow more smoothly towards the user, the first arc portion 111 may continue to bend forward and inward, and the front cover 11 may also include a front cover 13, the central portion of which is recessed rearward to form a negative pressure zone 132. The air flowing from the air outlet 17 converges and flows forward and inward through the outer surface of the first arc portion, thereby allowing the user to receive a large area and a large volume of concentrated airflow. Of course, in other embodiments, the front cover 13 may also be separately formed, the front cover 13 having a fifth arc portion 131, the fifth arc portion 131 smoothly connecting to the front end of the first arc portion 111, the central portion of which is recessed rearward to form the negative pressure zone 132. It should be understood that in this embodiment, the central portion of the front cover 13 is recessed rearward, but in other embodiments, the central portion of the front cover 13 may also be protruding forward, or the central portion of the front cover 13 may be flat. The front cover 13 has a greater flow-gathering effect when the central part of the front cover protrudes forward than when it is flat, and the flow-gathering effect when the central part of the front cover 13 is flat is greater than when it is recessed backward. The front cover 13 can be configured in different forms according to the required flow-gathering effect.

[0051] like Figures 3 to 6 As shown, in one embodiment, the rear baffle 14 includes a baffle 141 and a guide portion 142. The guide portion 142 includes a central protrusion 143 and a sixth arc portion 144 connecting the protrusion 143 and the baffle 141. The sixth arc portion 144 extends forward and inward. Therefore, there is a gap between the sixth arc portion 144 and the fourth arc portion 122. External airflow flows into the air inlet 16 through the gap between the sixth arc portion 144 and the fourth arc portion 122, and then flows into the air intake of the centrifugal axial flow conversion assembly 300. The protrusion 143 is close to the rear end of the hub 31 of the centrifugal axial flow conversion assembly 300, making the airflow channel smoother and reducing the generation of turbulent noise.

[0052] It should be understood that, furthermore, before the external airflow enters the gap between the sixth arc section 144 and the fourth arc section 122, the external airflow flows to the air inlet 16 via the outer surfaces of the third arc section 121 and the fourth arc section 122 through the wall effect, thereby forming a complete air inlet and outlet system.

[0053] like Figures 3 to 6 As shown, in one embodiment, a baffle plate 124 is provided between the third guide section 123 and the fourth arc section 122. The baffle plate 124 is close to the blade trailing edge 324 of the centrifugal axial flow conversion assembly 300, so that the airflow flows quickly and regularly to the vent 18, and avoids the airflow from overflowing from one end of the blade trailing edge 324.

[0054] like Figures 1 to 6 As shown, in this embodiment, the bladeless fan is a handheld fan. The bladeless fan also includes a support 5 for handheld use, which is connected to the outside of the housing. A rechargeable battery 6 is disposed inside the support 5, and the rechargeable battery 6 is connected to the motor 2 via wires, thereby driving the centrifugal axial flow conversion assembly 300.

[0055] like Figure 10 and Figure 11 As shown, in this embodiment, the bladeless fan is a desktop fan. The bladeless fan also includes a support 5, which is connected to the outside of the housing. A rechargeable battery 6 is housed within the support 5, and the rechargeable battery 6 is connected to the motor 2 via wires, thereby driving the centrifugal-axial flow conversion assembly 300. The upper part of the desktop fan has a basically the same structure as the upper part of the handheld fan, and will not be described further here.

[0056] like Figure 12 and Figure 13 As shown, in this embodiment, the bladeless fan is a floor-standing fan. The bladeless fan also includes a support 5, which is connected to the outside of the housing. A rechargeable battery 6 is housed within the support 5, and the rechargeable battery 6 is connected to the motor 2 via wires, thereby driving the centrifugal-axial flow conversion assembly 300. The upper part of the floor-standing fan has a structure basically the same as the upper part of the handheld fan, and will not be described further here.

[0057] In other embodiments, the support 5 may be omitted, and the rechargeable battery 6 may be disposed inside the housing 1 and located on the front side of the fan assembly.

[0058] It should be understood that the bladeless fan can also be a neck fan, clip fan, waist fan, etc., only requiring a corresponding change in the size of the components.

[0059] The above detailed description is only an illustration of the preferred embodiment of this application and is not intended to limit the patent scope of this application. Therefore, all equivalent technical changes made using the content of this invention's specification and illustrations are included within the patent scope of this invention.

Claims

1. A bladeless fan, characterized in that, include: The outer casing is provided with an air inlet and an air outlet that communicate with the interior of the outer casing; The fan assembly is housed within the housing; The air outlet is located in the middle area between the front and rear ends of the outer casing.

2. The bladeless fan as described in claim 1, characterized in that: The fan assembly includes a motor and a centrifugal axial flow conversion assembly. The centrifugal axial flow conversion assembly includes a hub and multiple blades. The motor is housed on one side of the hub, and the multiple blades are spaced apart and connected to the radial outer side of the hub.

3. The bladeless fan as described in claim 1, characterized in that: The outer shell includes a front cover and a rear cover. The front cover includes a first arc portion and a second arc portion connected together. The rear cover includes a third arc portion and a fourth arc portion connected together. The first arc portion, the second arc portion, the third arc portion and the fourth arc portion are all curved and extended.

4. The bladeless fan as described in claim 3, characterized in that: The second arc portion and the third arc portion are spaced apart, and at least part of the second arc portion is blocked from the outside by the third arc portion. The air outlet is located between the second arc portion and the third arc portion.

5. The bladeless fan as described in claim 4, characterized in that: The housing also includes a plurality of guide strips, which connect the second arc portion and the third arc portion.

6. The bladeless fan as described in claim 4, characterized in that: The third arc portion is positioned forward, and the fourth arc portion extends and curves from the third arc portion, with its end facing forward, forming the air inlet.

7. The bladeless fan as described in claim 6, characterized in that: The housing also includes a rear baffle, which is fixed to the fourth arc portion and has a gap between it and the fourth arc portion. The rear baffle completely blocks the air inlet from the rear.

8. The bladeless fan as described in claim 4, characterized in that: The first arc extends forward and is radially reduced from back to front. The third arc bends forward and is radially increased from back to front. Airflow flows into the air inlet from the gap between the rear baffle and the fourth arc, then into the fan assembly, then out of the fan assembly and into the air outlet, and then flows forward from the air outlet via the outer surface of the first arc.

9. The bladeless fan as described in claim 1, characterized in that: It also includes a support that is connected to the outside of the housing, and a rechargeable battery is provided inside the support.

10. The bladeless fan as described in claim 1, characterized in that: It also includes a rechargeable battery, which is disposed inside the housing and on the front side of the fan assembly.

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