Fan blade

Abstract

The utility model provides a fan blade which comprises a wheel shell, the wheel shell comprises a rear end part, an expansion part and a smooth part, the expansion part is forwards and radially enlarged and extends from the rear end part, the smooth part is forwards and radially invariably extends from the expansion part, the wheel shell further comprises a fixing column located in the center of the inner side, and the fixing column is used for fixing a rotating shaft; the multiple blades are connected to the outer surface of the wheel shell, and the multiple blades are arranged at intervals in a surrounding mode; wherein the slope of the expanding part is continuously reduced from back to front, the multiple blades are connected to the outer surface of the expanding part, the air inlet face is expanded, the air suction capacity is enhanced, and the air inlet amount is increased. And the airflow is guided and pressurized through the expanding part, the pressurized airflow is smoothly and forwards guided out through the smooth part, the air pressure is increased, and flowing is smooth.

Description

Technical Field

[0001] This application relates to the technical field of fans, and particularly to a blade with excellent performance. Background Art

[0002] Blades are widely used in the fields of electrical appliances such as computers and other electronic devices, hair dryers, and fans. The most basic performance of a blade is to suck and blow air, and the air suction and blowing performance of a fan is highly related to its own structural characteristics.

[0003] In the context of the era of global warming caused by the greenhouse effect, more and more people pursue the use of fan devices to achieve the effects of blowing air, dissipating heat, and cooling. As an important part inside the fan, the design of the hub and the blades of the blade directly affects the air suction and blowing performance of the blade, and thus affects the blowing effect of the fan. Therefore, there is an urgent need to design a blade with excellent air suction and blowing performance. Summary of the Invention

[0004] In view of this, this application provides a blade. A plurality of the blades are connected to the outer surface of the enlarged portion, which enlarges the air inlet surface, enhances the air suction capacity, and increases the air intake. And the enlarged portion guides and pressurizes the airflow, and the smooth portion smoothly guides the pressurized airflow forward, so that the air pressure increases and the flow is smooth.

[0005] This application provides a blade, including: a hub, including a rear end portion, an enlarged portion, and a smooth portion. The enlarged portion extends radially forward from the rear end portion, and the smooth portion extends radially forward with a constant diameter from the enlarged portion. The hub further includes a fixing column located at the inner center, and the fixing column is used to fix the rotating shaft; a plurality of blades, connected to the outer surface of the hub, and the plurality of blades are arranged at intervals around the circumference; wherein, the slope of the enlarged portion continuously decreases from the rear to the front, and the plurality of blades are connected to the outer surface of the enlarged portion.

[0006] Further, the axial length of the hub is 28.03 - 36.03 mm, the axial length of the enlarged portion is 20.72 - 24.72 mm, and the axial length of the smooth portion is 7.3 - 11.3 mm.

[0007] Further, the diameter of the rear end portion is 6.37 - 12.71 mm, the diameter of the smooth portion is 30.5 - 34.5 mm, and the diameter of the enlarged portion is 6.37 - 30.5 mm.

[0008] Further, each blade includes a blade root connected to the hub, and a blade tip opposite to the blade root. The blade root extends clockwise from the rear to the front, and the blade tip extends clockwise from the rear to the front. And in the same blade, the projection of the blade root on the hub intersects with the projection of the blade tip on the hub.

[0009] Further, the axial distance between the rear end of the blade root and the rear end portion is 4.77 - 6.77 mm, and the axial distance between the front end of the blade root and the rear end of the smooth portion is 1.18 - 3.18 mm.

[0010] Further, the projections of the plurality of blade tops of the plurality of blades on the axis are located on the same circle, and the diameter of the circle where the projection of the blade top on the axis is located is 50.8 - 54.8 mm.

[0011] Further, each blade further includes a leading edge portion and a trailing edge portion. The leading edge portion connects the front end of the blade root and the front end of the blade top, and the trailing edge portion connects the rear end of the blade root and the rear end of the blade top. The leading edge portion and the trailing edge portion are oppositely arranged, and the leading edge portion is shorter than the trailing edge portion.

[0012] Further, the length of the leading edge portion is 8.18 - 12.18 mm, and the length of the trailing edge portion is 13.55 - 17.55 mm.

[0013] Further, the included angle between the line connecting the front and rear ends of the blade root and the axis is 30 - 80°; the included angle between the line connecting the front and rear ends of the blade root and the line connecting the front and rear ends of the blade top is 5 - 25°.

[0014] Further, the number of the blades is 9 - 15. In the radial direction and from the inside to the outside, the adjacent blades change from an overlapping state to a spaced state, and the space gradually increases.

[0015] Compared with the prior art, the wind blade of the present application has the following beneficial effects: The plurality of blades are connected to the outer surface of the enlarged portion, expanding the air inlet surface, enhancing the air suction capacity, and increasing the air inlet volume. And through the flow guiding and pressurizing of the enlarged portion to the air flow, the smooth portion smoothly guides the pressurized air flow forward, increasing the wind pressure and making the flow smooth. Description of the Drawings

[0016] Figure 1 is a three-dimensional schematic diagram of the air outlet component of the present application;

[0017] Figure 2 is a rear view of the air outlet component of the present application;

[0018] Figure 3 is Figure 2 an enlarged view of part A in

[0019] Figure 4 is a cross-sectional view of the air outlet component of the present application;

[0020] Figure 5It is a schematic diagram of the braking component of the present application;

[0021] Figure 6 is Figure 5 the right view of;

[0022] Figure 7 It is a schematic diagram of the air outlet component of the present application with the braking component removed;

[0023] Figure 8 It is a sectional view of the air outlet component of the present application;

[0024] Figure 9 It is a sectional view of the air outlet component of another embodiment of the present application;

[0025] Figure 10 It is a schematic diagram of the braking component of another embodiment of the present application;

[0026] Figure 11 It is an exploded view of the braking component of another embodiment of the present application. Detailed implementation manners

[0027] For better understanding of the purpose, structure, features, and effects of the present application, the present application will be further described below in conjunction with the accompanying drawings and specific implementation manners.

[0028] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be intermediate elements present simultaneously.

[0029] In the present application, descriptions such as "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features.

[0030] In the description of the present application, the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "up", "down", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0031] In one embodiment, as Figure 1 , Figure 2 and Figure 4As shown in the figure, it is a schematic diagram of the air outlet component of the present application. The air outlet component includes a cylinder body and a braking component. The cylinder body includes an outer ring part 1, an inner ring part 2, and a plurality of guide vanes 3 connecting the outer ring part 1 and the inner ring part 2. The outer ring part 1 is penetrated front and back, with air inlet at the rear end and air outlet at the front end. From the rear to the front, the diameter change range of the inner wall of the outer ring part 1 is less than 5 mm. The inner ring part 2 is coaxially arranged with the outer ring part 1. The inner ring part 2 is connected to the outer ring part 1 through a plurality of the guide vanes 3, and the inner ring part 2 extends radially unchanged from the rear to the front. The braking component is coaxially arranged with the outer ring part 1. The braking component is installed at the rear side of the inner ring part 2 and is received inside the outer ring part 1 in the radial direction. The braking component includes a wind wheel 4 and a motor 5. The wind wheel 4 includes a wheel shell 41 and a plurality of blades 42 connected to the outer surface of the wheel shell 41. The plurality of blades 42 are arranged at intervals around. The motor 5 is arranged radially inside the wheel shell 41. Among them, the wheel shell 41 and the inner ring part 2 are arranged side by side front and back, and the difference between the maximum diameter of the wheel shell 41 and the diameter of the inner ring part 2 is less than 5 mm.

[0032] Through the spatial layout of the front-and-back penetrated outer ring part 1, the inner ring part 2 coaxially arranged with the outer ring part 1, and the braking component, plus the small axial change range of the inner cavity diameter of the outer ring part 1 and the small difference between the maximum diameter of the wheel shell 41 and the diameter of the inner ring part 2 in terms of structural design, the air outlet component can be made small and portable, while ensuring the air volume and air outlet effect. It should be understood that the air outlet component can be applied in portable fans such as neck fans, hand-held fans, desktop fans, floor fans, etc., without being limited to the examples.

[0033] In one embodiment, as Figure 1 、 Figure 2 and Figure 4 shown, from the rear to the front, the diameter of the inner wall of the outer ring part 1 remains unchanged, and the diameter of the inner wall of the outer ring part 1 is 51.76 - 55.76 mm. The maximum diameter of the wheel shell 41 is equal to the diameter of the inner ring part 2, and the maximum diameter of the wheel shell 41 and the diameter of the inner ring part 2 are both 30.5 - 34.5 mm. For the coaxially arranged outer ring part 1, inner ring part 2 and wheel shell 41, the inner ring part 2 and the wheel shell 41 are arranged radially inside the outer ring part 1. The diameter of the inner wall of the outer ring part 1 remains unchanged from the front to the back, and the maximum diameter of the wheel shell 41 is equal to the diameter of the inner ring part 2. The air duct is penetrated front and back without obstruction. Therefore, the air generated by the plurality of blades 42 can flow out smoothly. And, since the diameter of the inner wall of the outer ring part 1 is 51.76 - 55.76 mm, and the maximum diameter of the wheel shell 41 and the diameter of the inner ring part 2 are both 30.5 - 34.5 mm, there is still a circular air duct of 17.26 - 25.26 mm left. The cross-section of the air duct is large and the air outlet effect is good.

[0034] In one embodiment, as Figure 1 , Figure 2 and Figure 4 shown, the ratio of the outer diameter of the inner ring portion 2 to the outer diameter of the outer ring portion 1 is 0.5 to 0.61. It can be seen that within the outer ring portion 1, excluding the inner ring portion 2, there is still nearly half of the air duct left. The cross-section of the air duct is large, and the air outlet effect is good.

[0035] In one embodiment, as Figure 1 , Figure 2 and Figure 4 shown, a substrate 21 is provided inside the inner ring portion 2, and a hollow shaft cylinder 22 extending backward from the substrate 21. The inner ring portion 2 forms a receiving portion 23 on the front side of the substrate 21. The receiving portion 23 is used to receive the circuit board 6 and / or a display member (not shown, the same below). When the display member is provided in the receiving portion 23, a light-transmitting cover plate may be provided at the front end of the inner ring portion 2 for externally displaying the data of the display member. The data of the display member includes but is not limited to the wind speed gear and the power. When the switch of the air outlet component is a stepless speed regulation switch, the wind speed gear can correspondingly be from 1 to 100 gears.

[0036] In one embodiment, as Figures 4 to 6 shown, the motor 5 includes a stator assembly 51 and a rotor assembly 52. The stator assembly 51, the rotor assembly 52, and the wind blade 4 are nested and fixed to the shaft cylinder 22. The rotor assembly 52 includes a rotating shaft 521, a bearing 522, and a magnetic ring 523. The rotating shaft 521 and the bearing 522 are inserted and fixed inside the shaft cylinder 22, and the bearing 522 is located between the rotating shaft 521 and the shaft cylinder 22. The stator assembly 51 is fixedly provided on the radial outer side of the shaft cylinder 22, the magnetic ring 523 is provided on the radial outer side of the stator assembly 51, and the magnetic ring 523 is fixedly provided on the radial inner side of the wheel housing 41. That is to say, the rotating shaft 521, the magnetic ring 523, the shaft cylinder 22, the stator assembly 51, the magnetic ring 523, and the wheel housing 41 are arranged in sequence from the inside to the outside in the radial direction. The structure of the motor 5 in the form of an outer rotor has a reasonable spatial distribution and rotates more stably.

[0037] In one embodiment, as Figures 4 to 6 , Figure 9 and Figure 10 shown, the ratio of the axial length of the magnetic ring 523 to the axial length of the wheel housing 41 is 0.32 to 0.57. The axial length of the wheel housing 41 is relatively long, and the magnetic ring 523 can be well received inside the wheel housing 41, making reasonable use of the space inside the wheel housing 41. In addition, the wheel housing 41 for receiving the magnetic ring 523 also has a correspondingly longer pressurizing distance.

[0038] In one embodiment, as Figures 4 to 6 shown, the motor 5 is a three-phase motor. The characteristic of a three-phase motor is that it has three power lines and is powered by a three-phase power supply. In this embodiment, the stator assembly 51 includes an iron core 511 and coils 512. The iron core 511 includes nine tooth portions 5111, and the coils 512 are wound around the tooth portions 5111. Three wires are led out from the coils 512, and the three wires can extend out through the through holes penetrating the substrate 21 to be electrically connected to the circuit board 6 and / or the display member received in the receiving portion 23. The circuit board 6 and / or the display member are electrically connected to an external power supply or a power supply member attached to the air outlet member through wires, so that the external power supply or the power supply member can supply power to the motor 5. Among them, in this embodiment, the number of magnetic poles of the magnetic ring 523 is 8 poles, and the number of pole pairs is 4 pairs. In other embodiments, the iron core 511 may also include 12 tooth portions 5111 or 6 tooth portions 5111.

[0039] In another embodiment, as Figures 9 to 11 shown, the motor 5 is a single-phase motor. The characteristic of a single-phase motor is that it has only one power line and one neutral line and is powered by an AC power supply. In this embodiment, the stator assembly 51 includes an iron core 511 and coils 512. The iron core 511 includes four tooth portions 5111, and the coils 512 are wound around the tooth portions 5111. The iron core 511 further includes steel needles 5112 for insertion and connection to the circuit board 6. The circuit board 6 is disposed on one side of the shaft cylinder, and the steel needles 5112 are inserted forward and fixed to the circuit board 6. The circuit board 6 is then connected by connecting wires that extend from the through holes penetrating the substrate 21 to be electrically connected to the circuit board 6 and / or the display member received in the receiving portion 23. The circuit board 6 and / or the display member are electrically connected to an external power supply or a power supply member attached to the air outlet member through wires, so that the external power supply or the power supply member can supply power to the motor 5. Among them, in this embodiment, the number of magnetic poles of the magnetic ring is 4 poles, and the number of pole pairs is 2 pairs.

[0040] In one embodiment, as Figure 2 、 Figure 4 and Figure 6As shown, the wheel hub 41 includes a rear end portion 411, an enlarged portion 412 that radially increases forward from the rear end portion 411, and a smooth portion 413 that is radially constant forward from the enlarged portion 412. The slope of the enlarged portion 412 continuously decreases from rear to front, and the overall shape of the wheel hub 41 is similar to a bullet shape. The wheel hub 41 has the enlarged portion 412 with a radial increase, so the wind pressure can be increased. Also, because the slope of the enlarged portion 412 continuously decreases, it avoids generating huge noise due to excessive wind pressure. A plurality of the blades 42 are connected to the outer surface of the enlarged portion 412, expanding the air intake surface, enhancing the air suction ability, and increasing the air intake volume. And through the guiding and pressurizing of the airflow by the enlarged portion 412, the smooth portion 413 smoothly guides the pressurized airflow forward, increasing the wind pressure and having a smooth flow. The smooth portion 413 is radially constant, and the strong wind formed by pressurization blows out smoothly. The wheel hub 41 further includes a fixing post 425 located at the inner center, and the fixing post 425 is used for fixedly connecting the rotating shaft 521.

[0041] In one embodiment, as Figure 4 , Figure 6 and Figure 9 shown, the rear end of the stator assembly 51 does not extend backward beyond the rear end of the magnetic ring 523, the front end of the magnetic ring 523 does not extend forward beyond the front end of the smooth portion 413, and the rear end of the magnetic ring 523 extends backward beyond the rear end of the smooth portion 413. In this embodiment, the magnetic ring 523 is completely disposed inside the wheel hub 41, and the front edge of the magnetic ring 523 is flush with the front edge of the wheel hub 41. The stator assembly 51 and the magnetic ring 523 are received inside the radial direction of the smooth portion 413 and a part of the radial direction of the enlarged portion 412, reasonably utilizing the internal space of the wheel hub 41. Additionally, as Figure 5 shown, a plurality of convex ribs (not labeled, the same below) can be spaced around the inner wall of the wheel hub 41, and the magnetic ring 523 is held and fixed inside the radial direction of the plurality of convex ribs. The plurality of convex ribs can reduce errors and better press and fix the magnetic ring 523. And a dynamic balance material can be provided between the plurality of convex ribs or between adjacent convex ribs to ensure the dynamic balance of the entire wind blade 4. Of course, as Figure 10 stated, the convex ribs may not be provided on the inner wall of the wheel hub 41. It should be understood that in other embodiments, a housing may also be provided between the magnetic ring 523 and the wheel hub 41 to ensure the strength between the structures.

[0042] In one embodiment, as Figure 4 , Figure 6 and Figure 9As shown, the axial length of the wheel hub 41 is 28.03 - 36.03 mm, the axial length of the enlarged portion 412 is 20.72 - 24.72 mm, and the axial length of the smooth portion 413 is 7.3 - 11.3 mm. The relatively long axial length of the enlarged portion 412 is beneficial to enhancing the wind pressure. The relatively short axial length of the smooth portion 413 is beneficial to shortening the overall axial length of the air outlet component.

[0043] In one embodiment, as Figure 4 、 Figure 6 and Figure 9 shown, the diameter of the rear end portion 411 is 6.37 - 12.71 mm, the diameter of the smooth portion 413 is 30.5 - 34.5 mm, and the diameter of the enlarged portion 412 is 6.37 - 30.5 mm. From the rear end portion 411 with a smaller diameter, through the diameter change of the enlarged portion 412 with a longer axial length, it transitions to the smooth portion 413 with a larger diameter, enabling the smooth flow of air to increase pressure and enhance potential energy.

[0044] In one embodiment, as Figure 2 、 Figure 4 、 Figure 6 、 Figure 8 and Figure 9 shown, each blade 42 includes a blade root portion 421 connected to the wheel hub 41, and a blade tip portion 422 opposite to the blade root portion 421, a leading edge portion 423 connecting the blade root portion 421 and the blade tip portion 422, and a trailing edge portion 424 connecting the blade root portion 421 and the blade tip portion 422. The leading edge portion 423 and the trailing edge portion 424 are disposed opposite to each other. The leading edge portion 423 is shorter than the trailing edge portion 424. The length of the leading edge portion is 8.18 - 12.18 mm, and the length of the trailing edge portion is 13.55 - 17.55 mm. In cooperation with the enlarged portion 412 with a radially increasing diameter, this is beneficial to maintaining the uniform height of the blade tip portion 422 in the radial direction, thereby ensuring a stable increase in wind pressure.

[0045] The blade root portion 421 extends clockwise from back to front, the blade tip portion 422 extends clockwise from back to front, and in the same blade 42, the projection of the blade root portion 421 on the wheel hub 41 intersects with the projection of the blade tip portion 422 on the wheel hub. It can be known that although both the blade tip portion 422 and the blade root portion 421 extend clockwise, the blade tip portion 422 has a deflection angle relative to the blade root portion 421, that is, the blade 42 is twisted, and the air suction and air supply capabilities are stronger.

[0046] The blade root 421 is provided in the enlarged portion 412. The axial distance between the rear end of the blade root 421 and the rear end portion 411 is 4.77 - 6.77 mm, and the axial distance between the front end of the blade root 421 and the rear end of the smooth portion 413 is 1.18 - 3.18 mm. It can be seen that the blade root 421 is provided at a position of the enlarged portion 412 close to the smooth portion 413. The rear end of the enlarged portion 412 guides and pressurizes the flow, and then the flow is cut by the blade 42. After forming a strong wind, it is ejected forward from the smooth portion 413.

[0047] In one embodiment, as Figure 2 and Figure 3 shown, from the axial perspective, the axial projections of the plurality of blade tops 422 of the plurality of blades 42 are on the same circle. The diameter of the circle where the axial projection of the blade top 422 is located is 50.8 - 54.8 mm. And the axial projections of the plurality of blade tops 422 and the axial projection of the outer ring portion 1 are concentric circles. The gap between the blade top 422 and the inner wall of the outer ring portion 1 is 0.96 - 4.96 mm. The blade 42 has a good air suction effect, and the blade 42 and the outer ring portion 1 have a further effect of pressurizing the air flow, and the air outlet effect is better.

[0048] As Figure 2 、 Figure 5 、 Figure 6 and Figure 8 shown, in this embodiment, at least part of two adjacent blades 42 overlap axially. In the radial direction and from the inside to the outside, the adjacent blades 42 change from an overlapping state to a spaced state, and the space gradually increases. The overlapping part of the blades 42 can provide greater suction for the wind blade 4. At the same time, leaving a space can weaken the pressure difference between the front and rear of the blade 42 and avoid whistling noise. The included angle between the line connecting the front and rear ends of the blade root 421 and the axis is 30 - 80°. While ensuring a relatively high wind speed can be provided, it can also perform air swirling cutting at a small angle, so the wind noise can be effectively reduced. The included angle between the line connecting the front and rear ends of the blade root 421 and the line connecting the front and rear ends of the blade top 422 is 5 - 25°. With such a setting, the blade 42 can perform air swirling cutting at a small angle, making the sent wind force more uniform and gentle, and the sound insulation effect is better. It should be understood that the included angle between the projection of the blade root 421 on the enlarged portion 412 and the projection of the blade top 422 on the enlarged portion 412 should not be too large, otherwise the wind resistance will increase and it is not conducive to the rotation of the wind blade 4. Of course, it should not be too small either, otherwise the above effects cannot be achieved.

[0049] In one embodiment, as Figure 2 、 Figure 4 、 Figure 7 and Figure 8As shown, when looking from the back to the front, the blade 42 extends in a clockwise spiral, and the guide vane 3 first extends in a counterclockwise spiral from the back to the front and then extends straight forward. The spiral direction of the rear part of the guide vane 3 is opposite to that of the blade 42. Under the action of the expansion part 412 and the blade 42, the air flow is pressurized to form a turbulent flow, and then through the combing of the smooth part 413 and the guide vane 3 with the opposite spiral direction, the air blows out smoothly forward.

[0050] In one embodiment, as Figure 1 , Figure 4 , Figure 7 , Figure 8 and Figure 9 shown, each guide vane 3 includes a first section 31 connected to the inner ring part 2, and a second section 32 extending backward from the first section 31. The radially outer side of the second section 32 is connected to the outer ring part 1, the radially inner side of the second section 32 is suspended, and is spaced from the smooth part 413. The axial distance between the leading edge part 423 and the second section 32 is 1 - 8 mm. The wheel housing 41 and the inner ring part 2 are arranged side by side front and back. The diameter of the smooth part 413 is equal to the diameter of the inner ring part 2, and the distance between the smooth part 413 and the inner ring part 2 is 0.5 - 2 mm, that is, the distance between the wheel housing 41 and the inner ring part 2 is 0.5 - 2 mm, thus forming a smooth inner core; at the same time, the axial distance between the leading edge part 423 and the second section 32 is 1 - 8 mm, and the air flow generated by the blade 42 can also be quickly transmitted to the guide vane 3, avoiding the occurrence of backflow and blocking of the air flow, and the noise reduction effect is obvious.

[0051] Preferably, the axial distance between the blade 42 and the guide vane 3 is 1.5 - 3.5 mm, that is, the axial distance between the leading edge part 423 and the second section 32 is 1.5 - 3.5 mm. The guide vane 3 has the functions of rectifying and guiding the air flow, and by setting the axial distance between the blade 42 and the guide vane 3, it ensures the smooth transition of the air flow between the blade 42 and the guide vane, reduces the turbulent flow, and reduces the noise. The diameter of the wind blade 4 is 50.8 - 54.8 mm, and the ratio of the axial distance between the blade 42 and the guide vane 3 to the diameter of the wind blade 4 is 0.027 - 0.069. It can be seen that the axial distance between the blade 42 and the guide vane 3 is short enough relative to the diameter of the wind blade 4, the flow path is well connected, the air flow consumption is small, and the air can flow forward smoothly.

[0052] In addition, the second section 32 adjacent to the leading edge part 423 extends counterclockwise from the back to the front, and the front first section 31 first extends counterclockwise and then extends straight forward. After the second section 32 combs the air flow generated by the blade 42, the first section 31 guides the combed air flow to blow out straight forward, and the user's blowing experience is better.

[0053] In one embodiment, as Figure 2 , Figure 5 and Figure 10 shown, the number of the blades 42 is 9, and the number of the guide vanes 3 is 7. The number of the blades 42 being odd is beneficial to the dynamic balance design of the overall wind blades 4, and the difference between the number of the guide vanes 3 and the number of the blades 42 is relatively small, which is beneficial to the guide vanes 3 better combing the strong air flow generated by the blades 42. Of course, in other embodiments, the numbers of the blades 42 and the guide vanes 3 may be other numbers. For example, the number of the blades 42 may be 9 - 15.

[0054] In some embodiments, the inner ring part 2 and the outer ring part 1 are coaxially arranged, and both the inner ring part 2 and the outer ring part 1 are cylindrical. The front end of the inner ring part 2 is flush with the front end of the outer ring part 1, or the front end of the inner ring part 2 extends forward beyond the front end of the outer ring part 1, and the rear end of the outer ring part 1 extends backward beyond the rear end of the inner ring part 2. Taking the front end of the outer ring part 1 as the origin, the axial distance between the front end of the inner ring part 2 and the front end of the outer ring part 1 is -5 to 2 mm. In other words, it is the range from the front end of the inner ring part 2 protruding 5 mm forward relative to the front end of the outer ring part 1 to the front end of the inner ring part 2 recessing 2 mm backward relative to the front end of the outer ring part 1. Taking the rear end of the outer ring part 1 as the origin, the axial distance between the rear end of the wheel housing 41 and the rear end of the outer ring part 1 is -18 to 5 mm. In other words, it is the range from the rear end of the wheel housing 41 recessing 18 mm forward relative to the rear end of the outer ring part 1 to the rear end of the wheel housing 41 protruding 5 mm backward relative to the rear end of the outer ring part 1. Preferably, in one embodiment, the front end of the inner ring part 2 is flush with the front end of the outer ring part 1, and the rear end of the wheel housing 41 is recessed forward relative to the rear end of the outer ring part 1. With such a setting, an air inlet space can be formed between the rear end of the wheel housing 41 and the rear end of the outer ring part 1, further reducing noise. It should be understood that the rear end of the wheel housing 41 is the rear end part 411.

[0055] In one embodiment, the rear end of the wheel housing 41 extends backward beyond the rear end of the outer ring part 1, but multiple blades 42 are all received inside the outer ring part 1, and the gap between the blades 42 and the outer ring part 1 is 0.96 - 4.96 mm. The rear end of the wheel housing 41 sucks in and guides the air flow, and the blades 42 and the outer ring part 1 pressurize the air flow to enhance the wind energy.

[0056] The above detailed description is only for the description of the preferred embodiments of the present application, and does not limit the patent scope of the present application. Therefore, all equivalent technical changes made by using the content of this creative specification and drawings are included in the patent scope of this creation.

Claims

1. A fan blade, characterized in that: include: The wheel shell comprises a rear end portion, an enlarged portion and a smooth portion, wherein the enlarged portion radially increases and extends forward from the rear end portion, and the smooth portion radially extends forward from the enlarged portion unchanged, and the wheel shell further comprises a fixing column located at the inner center, and the fixing column is used to fix the rotating shaft; A plurality of blades are connected to the outer surface of the wheel shell, and the plurality of blades are arranged in a circumferential manner at intervals; The slope of the expansion portion decreases continuously from the back to the front, and a plurality of blades are connected to the outer surface of the expansion portion.

2. A fan blade according to claim 1, characterized in that: The axial length of the wheel shell is 28.03-36.03 mm, the axial length of the enlarged portion is 20.72-24.72 mm, and the axial length of the smooth portion is 7.3-11.3 mm.

3. A fan blade according to claim 2, characterized in that: The diameter of the rear end portion is 6.37 to 12.71 mm, the diameter of the smooth portion is 30.5 to 34.5 mm, and the diameter of the enlarged portion is 6.37 to 30.5 mm.

4. A fan blade as claimed in claim 2, characterized in that: Each of the blades includes a blade root portion connected to the wheel shell, and a blade top portion opposite to the blade root portion, the blade root portion extends clockwise from back to front, and the blade top portion extends clockwise from back to front, and in the same blade, the projection of the blade root portion on the wheel shell intersects with the projection of the blade top portion on the wheel shell.

5. A fan blade as claimed in claim 4, characterized in that: An axial distance between the rear end of the blade root portion and the rear end portion is 4.77 to 6.77 mm, and an axial distance between the front end of the blade root portion and the rear end of the smooth portion is 1.18 to 3.18 mm.

6. A fan blade according to claim 5, characterized in that: The projections of the multiple blade tops of the multiple blades in the axial direction are located on the same circle, and the diameter of the circle where the projections of the blade tops in the axial direction are located is 50.8-54.8 mm.

7. A fan blade according to claim 4, characterized in that: Each of the blades also includes a leading edge portion and a trailing edge portion, wherein the leading edge portion connects the front end of the blade root portion and the front end of the blade top portion, and the trailing edge portion connects the rear end of the blade root portion and the rear end of the blade top portion, the leading edge portion and the trailing edge portion are arranged opposite to each other, and the leading edge portion is shorter than the trailing edge portion.

8. A fan blade according to claim 7, characterized in that: The length of the front edge portion is 8.18 to 12.18 mm, and the length of the rear edge portion is 13.55 to 17.55 mm.

9. A fan blade as claimed in claim 4, characterized in that: The angle between the connecting line of the front and rear ends of the blade root and the axial direction is 30 to 80 degrees; the angle between the connecting line of the front and rear ends of the blade root and the connecting line of the front and rear ends of the blade top is 5 to 25 degrees.

10. The fan blade according to claim 1, characterized in that: The number of the blades is 9-15, and in the radial direction from inside to outside, the adjacent blades change from an overlapping state to a spaced state, and the space between them gradually increases.

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