Bladeless fan

Abstract

This application provides a bladeless fan, comprising: a housing; a central component disposed radially inside the housing; and a fan assembly disposed radially inside the housing. An air inlet is formed radially near the axis of the housing, and an air outlet is formed radially away from the axis of the housing. The axial projection of the air inlet does not coincide with the axial projection of the air outlet. By ensuring that the axial projections of the air inlet and air outlet do not coincide, the air pressure and air velocity are increased as the air flows from the air inlet to the air outlet.

Description

Technical Field

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

[0002] There are increasingly more air-blowing devices available, such as air conditioners and traditional axial fans. However, as these devices become more integrated into people's lives, more and more problems are emerging. For example, while air conditioners provide cooling and ventilation, the airflow often makes people feel uncomfortable, especially during seasonal changes or when there are significant temperature fluctuations between day and night. Traditional axial fans, on the other hand, are being gradually replaced due to their limited airflow range and safety concerns.

[0003] People increasingly favor bladeless designs, which are more aesthetically pleasing and safer. However, bladeless fans often cannot provide high air pressure or volume, resulting in a weak breeze for the user. Therefore, it is necessary to improve existing bladeless fans to address these issues. Summary of the Invention

[0004] In view of this, this application provides a bladeless fan that increases air pressure and improves air speed by setting the projection of the air inlet on the axial direction to not coincide with the projection of the air outlet on the axial direction.

[0005] This application provides a bladeless fan, comprising: a housing; a central component disposed radially inside the housing; and a fan assembly disposed radially inside the housing; wherein an air inlet is formed at a radial position near the axis of the housing, and an air outlet is formed at a radial position away from the axis of the housing, and the axial projection of the air inlet does not coincide with the axial projection of the air outlet.

[0006] Furthermore, a bladeless fan includes: a housing; a central component disposed radially inside the housing; and a fan assembly disposed radially inside the housing; wherein an air inlet is formed radially near the axis of the housing, and an air outlet is formed radially away from the axis of the housing, and the axial projection of the air inlet does not coincide with the axial projection of the air outlet.

[0007] Furthermore, the housing includes an outer shell and an inner shell, the inner shell being located radially inside the outer shell and radially outside the central component and the fan assembly, the inner shell extending radially inward from back to front, and then extending radially unchanged thereafter.

[0008] Furthermore, the central component is located on the side near the front end of the housing, and the air outlet is formed between the housing and the central component.

[0009] Furthermore, it also includes multiple guide vanes, which connect the housing and the central component. Each guide vane extends spirally from back to front, and then extends straight forward.

[0010] 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.

[0011] Furthermore, the motor is fixed to the rear end of the central component, the centrifugal axial flow conversion assembly is fixed to the motor, and the maximum cross-sectional diameter of the centrifugal axial flow conversion assembly is smaller than the minimum cross-sectional diameter of the central component.

[0012] Furthermore, the central component is located at the center of the radial inner side of the housing, and the central component, the motor, and the centrifugal axial flow conversion assembly are coaxially arranged.

[0013] Furthermore, the central component is provided with a shaft sleeve, and the motor includes a rotor assembly and a stator assembly. The rotor assembly includes a rotating shaft, a bearing, and a magnetic ring. One end of the rotating shaft and the bearing are inserted into the shaft sleeve, and the other end of the rotating shaft is inserted and fixed into the hub. The stator assembly is inserted outside the shaft sleeve, and the magnetic ring is fixed inside the hub and located outside the stator assembly.

[0014] Furthermore, it also includes a rechargeable battery electrically connected to the motor to drive the centrifugal axial flow conversion assembly.

[0015] Furthermore, the air inlet is located at the rear end of the housing, or at the center of the middle component, or at both the rear end of the housing and the center of the middle component.

[0016] Compared with the prior art, the bladeless fan of this application has the following beneficial effects: by setting the projection of the air inlet in the axial direction to not coincide with the projection of the air outlet in the axial direction, the air pressure is increased and the air speed is improved during the process of air flowing from the air inlet to the air outlet. Attached Figure Description

[0017] Figure 1 This is a perspective view of the bladeless fan of this application;

[0018] Figure 2 This is an exploded view of the bladeless fan of this application;

[0019] Figure 3 This is an exploded view of the bladeless fan of this application from another angle;

[0020] Figure 4This is a cross-sectional view of the bladeless fan of this application;

[0021] Figure 5 This is a perspective view of the centrifugal-axial flow conversion assembly of this application;

[0022] Figure 6 This is a perspective view of the centrifugal axial flow conversion component of this application from another angle. Detailed Implementation

[0023] To facilitate a better understanding of the purpose, structure, features, and effects of this application, the application will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] like Figures 1 to 4 The diagram shows a schematic of the bladeless fan of this application. The bladeless fan includes a housing 1, a central component 2, and a fan assembly. An air inlet 11 is formed radially near the axis of the housing 1, and an air outlet 12 is formed radially away from the axis of the housing 1. The axial projection of the air inlet 11 does not coincide with the axial projection of the air outlet 12. By setting the axial projection of the air inlet 11 to not coincide with the axial projection of the air outlet 12, the air pressure is increased and the air velocity is improved as the air flows from the air inlet 11 to the air outlet 12.

[0028] like Figures 2 to 4As shown, in one embodiment, the housing 1 includes an outer shell 14 and an inner shell 13. The inner shell 13 is located radially inside the outer shell 14 and radially outside the central member 2 and the fan assembly. The inner shell 13 increases radially from back to front, and then remains constant in the rear radial direction. In this embodiment, the rear end of the outer shell 14 bends inward and forward to coincide with the rear end of the inner shell 13. The bending extension of the rear end of the outer shell 14 effectively guides the airflow to the rear. The front end of the outer shell 14 bends inward and backward to connect with the front end of the inner shell 13, forming a smooth curved surface for smooth airflow. Of course, in other embodiments, it is possible that there are only one shell 1, without the two shells 14 and 13, as long as airflow can be achieved, and the specific shape of the shell 1 is not limited.

[0029] like Figure 1 , Figure 2 and Figure 4 As shown, in one embodiment, the central member 2 is located on the side near the front end of the housing 1, and the air outlet 12 is formed between the housing 1 and the central member 2. The housing 1 has a radially increasing portion from back to front, the central member 2 has a radially increasing portion from back to front, and the air outlet 12 is formed at a position radially away from the axis of the housing 1. Therefore, the area where the air outlet 12 is located is wider, and the air outlet effect is better.

[0030] like Figure 2 , Figure 4 , Figure 5 and Figure 6As shown, in one embodiment, the fan assembly includes a motor 3 and a centrifugal axial flow conversion assembly 4. The centrifugal axial flow conversion assembly 4 includes a hub 41 and a plurality of blades 42. The motor 3 is housed on one side of the hub 41, and the plurality of blades 42 are spaced apart and connected to the radially outer side of the hub 41. Each blade 42 includes a blade root 421 connected to the hub 41, a blade tip 422 opposite to the blade root 421, a blade leading edge 423 connecting the blade root 421 and the blade tip 422 and located at the front end, and a blade trailing edge 424 connecting the blade root 421 and the blade tip 422 and located at the rear end. In this embodiment, the axial projections of the blade leading edge 423 and the blade trailing edge 424 of each blade 42 overlap, and the axial projection at any position between the blade leading edge 423 and the blade trailing edge 424 of each blade 42 overlaps with the axial projections of the blade leading edge 423 and the blade trailing edge 424. In other words, from the leaf root 421 to the leaf tip 422 of the blade 42, the leading edge 423 and the trailing edge 424 do not undergo relative deformation or torsion, and the cross-sectional position between the leading edge 423 and the trailing edge 424 also does not undergo deformation or torsion relative to the leading edge 423 and the trailing edge 424. Of course, in other embodiments, the leading edge 423 and the trailing edge 424 may not undergo relative deformation or torsion, but the cross-sectional position between the leading edge 423 and the trailing edge 424 may undergo deformation or torsion relative to the leading edge 423 and the trailing edge 424. In other embodiments, the axial projections of the leading edge 423 and the trailing edge 424 of each blade 42 may not completely overlap, or may not overlap at all; that is, from the leaf root 421 to the leaf tip 422 of the blade 42, the leading edge 423 may undergo torsional deformation relative to the trailing edge 424.

[0031] In this embodiment, a plurality of blades 42 are directly connected to the radially outer side of the hub 41, and each blade 42 extends radially outward from the hub 41. Each blade 42 includes a first bend 425 and a second bend 426. The first bend 425 connects the hub 41 and the second bend 426, and the first bend 425 and the second bend 426 have opposite bending directions, and the length of the first bend 425 is greater than the length of the second bend 426.

[0032] Furthermore, from the hub 41 toward the end of the second bend 426, the blade trailing edge 424 first extends radially straight outward, then tilts backward and extends outward, and finally extends straight outward. The blade trailing edge 424 extends smoothly; however, in other embodiments, it may first tilt backward and extend outward, then extend straight outward, or it may continue to tilt backward and extend outward. Furthermore, from the hub 41 toward the end of the second bend 426, the blade leading edge 423 tilts forward and extends outward, then extends straight outward. In other embodiments, the blade leading edge 423 may first extend straight outward, then tilt forward and extend outward, and finally extend straight outward, or it may continue to tilt forward and extend outward, or it may continue to extend straight outward.

[0033] It should be understood that an airflow channel is formed between the plurality of blades 42, and an air intake (unmarked, the same below) is formed on one side of the trailing edge 424 of the plurality of blades 42. The area of ​​the air intake can even cover the central hub 41 area, thereby forming a large-area air intake. An air outlet (unmarked, the same below) is formed on one side of the tip 422 of the plurality of blades 42, or further, the air outlet is formed at the position of the tip 422 of the plurality of blades 42 near the leading edge 423, or the air outlet is formed at the position of the leading edge 423 of the plurality of blades 42 near the tip 422. In short, the air outlet is located near the position where the tip 422 and the leading edge 423 of the plurality of blades connect.

[0034] It should be understood that this is one form of each blade 42. In other embodiments, it may include only one bend or multiple bends. Alternatively, the centrifugal axial flow conversion assembly 4 may also have two or more different forms of blades 42, and is not limited to this embodiment. In other embodiments, the multiple blades 42 and the hub 41 may be indirectly connected, that is, a connecting member is provided between the multiple blades 42 and the hub 41. This is not limited to the examples provided, as long as airflow can be achieved.

[0035] like Figure 2 , Figure 4 , Figure 5 and Figure 6As shown, the centrifugal axial flow conversion assembly 4 further includes a plate portion 43 and a ring portion 44. The plate portion 43 is disposed on the leading edge 423 of the plurality of blades 42, and the plate portion 43 connects to the leading edge 423 of the plurality of blades 42 from the hub 41. In this embodiment, the end of the leading edge 423 of each blade 42 near the blade tip 422 extends beyond the plate portion 43 and is exposed forward. In other embodiments, the entire leading edge 423 of each blade 42 may be covered by the plate portion 43, or the plate portion 43 may not cover the portion of the leading edge 423 near the hub 41, but this is not a limitation. The ring portion 44 is disposed on the trailing edge 424 of the plurality of blades 42, and the ring portion 44 is not connected to the hub 41, but only to the portion of the trailing edge 424 of the blade 42 near the blade tip 422.

[0036] like Figures 4 to 6 As shown, in one embodiment, the hub 41 is open at the front and closed at the rear. The motor 3 is housed on one side of the open side of the hub 41, and the open side of the hub 41 faces away from the air intake, thus preventing dust and impurities from entering the motor 3. Of course, the hub 41 may also be open on both the front and rear sides, and the motor 3 may include a housing that blocks dust and impurities from entering the motor 3 from the rear.

[0037] like Figure 4 As shown, the motor 3 includes a stator assembly 32 and a rotor assembly 31. The rotor assembly 31 includes a shaft 311, a bearing 312, and a magnetic ring 313. The motor 3 is fixed to the rear end of the central component 2. Specifically, the central component 2 forms a shaft sleeve 22 from front to back, or the shaft sleeve 22 is fixed thereon. One end of the shaft 311 is inserted and fixed inside the shaft sleeve 22 through the bearing 312, and the other end of the shaft 311 is inserted and fixed inside the hub 41. The stator assembly 32 is sleeved on the radially outer side of the shaft sleeve 22, and the magnetic ring 313 is fixed on the radially inner side of the hub 41, and the magnetic ring 313 is located on the radially outer side of the stator assembly 32.

[0038] like Figure 3 and Figure 4 As shown, the air inlet 11 is directly located at the rear end of the housing 1. A rear shell 16 can also be fixed to the rear side of the housing 1, and the rear shell 16 has an air inlet hole, through which part of the airflow directly enters the air inlet 11. Alternatively, the airflow can enter the air inlet 11 through the gap between the rear shell 16 and the rear side of the housing 1. In other embodiments, the air inlet 11 may be located at the center of the middle component 2, or the air inlet 11 may be located at both the rear end of the housing 1 and the center of the middle component 2.

[0039] like Figures 2 to 4 As shown, the central component 2 is located on the side near the front end of the housing 1, forming the air outlet 12 between the housing 1 and the central component 2. The bladeless fan also includes multiple guide vanes 21, which connect the housing 1 and the central component 2, and divide the air outlet 12. Each guide vane 21 extends spirally from back to front, then extends straight forward. The arrangement of the guide vanes 21 helps guide the airflow forward, resulting in a better user experience. The centrifugal-axial flow conversion component 4 receives axial air in the middle area, and after radial skewing, the air is guided forward and axially blown out by the duct structure. The airflow is smooth, the centrifugal air pressure is high, and the wind speed is fast. It is converted into axial air, resulting in low wind loss and good air output effect.

[0040] like Figures 2 to 4 As shown, after the motor 3 is fixed, the centrifugal axial flow conversion assembly 4 is also fixed to the motor 3. The maximum cross-sectional diameter of the centrifugal axial flow conversion assembly 4 is smaller than the minimum cross-sectional diameter of the central component 2. That is to say, the portion of the central component 2 that extends radially beyond the centrifugal axial flow conversion assembly 4 can provide a longer airflow path. Therefore, the radial air blown out by the centrifugal axial flow conversion assembly 4 has a conversion path that converts it into axial airflow.

[0041] like Figures 2 to 4 As shown, the central component 2 is located at the center of the radially inner side of the housing 1, and the central component 2, the motor 3, and the centrifugal-axial flow conversion assembly 4 are coaxially arranged. That is, the central component 2, the motor 3, and the centrifugal-axial flow conversion assembly 4 are all located on the radially inner axis of the housing 1. The airflow generated by the centrifugal-axial flow conversion assembly 4 is smoothly converted into axial airflow towards the user by the inner wall of the housing 1, which is equidistant from each of its blades 42, and guided by the central component 2 and the guide vanes 21, resulting in a good user experience.

[0042] like Figures 2 to 4 As shown, the bladeless fan also includes a front cover 15, the central portion of which is recessed rearward to form a negative pressure zone (not labeled). This negative pressure zone enhances the airflow concentration effect. In other embodiments, the central portion of the front cover 15 may be protruding forward or flat. A protruding central portion of the front cover 15 provides a greater airflow concentration effect than a flat one, and a flat central portion provides a greater airflow concentration effect than a recessed one. Different forms of the front cover 15 can be configured according to the desired airflow concentration effect, and the specific form of the front cover 15 is not limited to these examples.

[0043] The bladeless fan also includes a rechargeable battery (not shown, the same below), which is electrically connected to the motor 3 to drive the centrifugal axial flow conversion assembly 4. Compared with existing bladeless fans, the bladeless fan of this application not only solves the problem of centrifugal fans not being able to blow directly, and improves the air duct structure, but also uses a rechargeable battery to provide power, greatly improving the ease of use of the bladeless fan. In this embodiment, the bladeless fan also includes a support 5, and the rechargeable battery is disposed in the support 5. Of course, in other embodiments, the rechargeable battery may also be disposed in front of the central component 2, or in the radially inner side of the housing 1, without limitation.

[0044] As shown in the figure, in this embodiment, the bladeless fan is a desktop fan. In other embodiments, the bladeless fan can also be a handheld fan, a floor-standing fan, etc., simply by changing the corresponding structural dimensions according to actual needs.

[0045] 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: case; The central component is located radially inside the housing; A fan assembly is located radially inside the housing; The housing has an air inlet located radially close to the axis and an air outlet located radially away from the axis. The axial projection of the air inlet does not coincide with the axial projection of the air outlet.

2. The bladeless fan as described in claim 1, characterized in that: The housing includes an outer shell and an inner shell. The inner shell is located radially inside the outer shell and radially outside the central component and the fan assembly. The inner shell extends radially from back to front, first increasing in size and then extending radially at the same distance.

3. The bladeless fan as described in claim 1, characterized in that: The central component is located on the side near the front end of the housing, and the air outlet is formed between the housing and the central component.

4. The bladeless fan as described in claim 3, characterized in that: It also includes multiple guide vanes, which connect the housing and the central component. Each guide vane extends spirally forward from back to front, and then extends straight forward.

5. The bladeless fan as described in claim 3, 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.

6. The bladeless fan as described in claim 5, characterized in that: The motor is fixed to the rear end of the central component, the centrifugal axial flow conversion assembly is fixed to the motor, and the maximum cross-sectional diameter of the centrifugal axial flow conversion assembly is smaller than the minimum cross-sectional diameter of the central component.

7. The bladeless fan as described in claim 5, characterized in that: The central component is located at the center of the radial inner side of the housing, and the central component, the motor, and the centrifugal axial flow conversion assembly are coaxially arranged.

8. The bladeless fan as described in claim 5, characterized in that: The central component is provided with a shaft sleeve. The motor includes a rotor assembly and a stator assembly. The rotor assembly includes a rotating shaft, a bearing, and a magnetic ring. One end of the rotating shaft and the bearing are inserted into the shaft sleeve, and the other end of the rotating shaft is inserted and fixed into the hub. The stator assembly is inserted outside the shaft sleeve, and the magnetic ring is fixed inside the hub and located outside the stator assembly.

9. The bladeless fan as described in claim 5, characterized in that: It also includes a rechargeable battery electrically connected to the motor to drive the centrifugal axial flow conversion assembly.

10. The bladeless fan as described in claim 3, characterized in that: The air inlet is located at the rear end of the housing, or at the center of the middle component, or at both the rear end of the housing and the center of the middle component.

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