Air supply device and handheld fan

Abstract

The utility model discloses an air supply device which comprises a fan and a fan cover. A main body bracket; a first air guide member; a second air guide member; the fan comprises a hub and fan blades, the fan blades are at least partially inclined or bent, and the inclined or bent direction is the same as the rotating direction of the fan; the first air guide piece comprises a first connecting piece and a first air guide piece, the first air guide piece is at least partially inclined or bent, and the inclined or bent direction is opposite to the rotating direction of the fan; the second air guide piece comprises a second connecting piece, a second air guide piece and an annular piece, the second air guide piece is at least partially inclined or bent, and the inclined or bent direction is the same as the rotating direction of the fan; the fan blades, the first air guide blades and the second air guide blades are obliquely arranged in the axial direction and / or the radial direction, the oblique direction of the fan blades is opposite to the oblique direction of the first air guide blades, the oblique direction of the second air guide blades is opposite to the oblique direction of the first air guide blades, and the effect of increasing the air speed is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of hand-held fans, in particular to an air supply device and a hand-held fan. Background Art

[0002] In the hot summer, fans have become essential items for people to relieve the heat. Along with the people's demand for convenient use, more lightweight and portable hand-held fans are increasingly favored by people.

[0003] For the existing hand-held fans, due to their small volume, the air volume blown out by the air supply device is limited and the wind speed is small, which affects the user experience and comfort. If the wind speed is to be increased, a high-speed motor needs to be used, which greatly increases the cost. Content of the Utility Model

[0004] To solve the deficiencies in the prior art, an air supply device and a hand-held fan are provided, which have the effect of increasing the wind speed.

[0005] The utility model is implemented by adopting the following technical solutions:

[0006] An air supply device includes: a blower, the blower includes a hub and fan blades, the hub is provided with a concave cavity, a motor is installed in the concave cavity, the motor is electrically connected to the blower, at least part of the fan blades are inclined or bent, and the inclination or bending direction is the same as the rotation direction of the blower; a main body bracket, the main body bracket is in a straight cylinder shape, an accommodation cavity is provided inside, the two ends are respectively an air inlet end and an air outlet end, and the blower is installed in the accommodation cavity; a first air guiding member, the first air guiding member is arranged in the accommodation cavity and is located at one end close to the air outlet end, the first air guiding member includes a first connecting member and a first air guiding piece, the first connecting member is in a ring shape, one end of the first air guiding piece is connected to the first connecting member, and the other end is connected to the main body bracket, at least part of the first air guiding piece is inclined or bent, and the inclination or bending direction is opposite to the rotation direction of the blower; a second air guiding member, the second air guiding member is connected to one end of the main body bracket close to the air outlet end and is adjacently connected to the first air guiding member, the second air guiding member includes a second connecting member, a second air guiding piece, and an annular member, the second air guiding piece is connected between the second connecting member and the annular member, at least part of the second air guiding piece is inclined or bent, and the inclination or bending direction is the same as the rotation direction of the blower.

[0007] Further, a flow guiding column is provided on the side of the second connecting member away from the air outlet end, and the flow guiding column is in a hemispherical shape.

[0008] Furthermore, the maximum distance of the fan blade in the axial direction is L1, and the range of L1 is 10 mm - 100 mm; the maximum distance of the first air guiding piece in the axial direction is L2, and the range of L2 is 10 mm - 100 mm; the maximum distance of the second air guiding piece in the axial direction is L3, and the range of L3 is 10 mm - 100 mm.

[0009] Furthermore, it further includes a third air guiding member. The third air guiding member is connected to one end of the second air guiding member away from the main body bracket. The third air guiding member includes a third connecting piece and a wind guiding plate. The wind guiding plate is formed by inward extension of the inner side surface of the third connecting piece. The wind guiding plate is annular, inclined along the air flow blowing direction, and is provided with a constriction. The outer diameter of the constriction is smaller than the outer diameter of the third connecting piece.

[0010] Furthermore, the hub central axis, the first connecting piece central axis, the second connecting piece central axis, and the third connecting piece central axis are located on the same straight line.

[0011] Furthermore, the fan blade includes a first top edge, a first bottom edge, a first leading edge, and a first trailing edge in the circumferential direction. The first bottom edge is connected to the circumferential side surface of the hub. The first top edge is located at one end of the fan blade away from the hub. The first leading edge is close to the air outlet end. The first trailing edge is close to the air inlet end. The first bottom edge is inclined relative to the hub central axis, and the included angle between the direction of the first bottom edge and the hub central axis direction is A1. The range of the included angle A1 is 15 degrees - 75 degrees. The first leading edge is inclined or bent relative to the hub radial direction, and the included angle between the direction of the first leading edge and the radial direction at the intersection of the first leading edge and the hub circumferential side surface is A2. The range of the included angle A2 is 15 degrees - 75 degrees. The inclination or bending direction of the first leading edge is the same as the fan rotation direction.

[0012] Furthermore, the first air guiding piece includes a second top edge, a second bottom edge, a second leading edge, and a second trailing edge in the circumferential direction. The second bottom edge is connected to the circumferential side surface of the first connecting piece. The second top edge is connected to the inner side surface of the main body bracket. The second leading edge is close to the air outlet end. The second trailing edge is close to the air inlet end. The second bottom edge is inclined relative to the first connecting piece central axis, and the included angle between the direction of the second bottom edge and the first connecting piece central axis direction is B1. The range of the included angle B1 is 10 degrees - 80 degrees. The second leading edge is inclined or bent relative to the first connecting piece radial direction, and the included angle between the direction of the second leading edge and the radial direction at the intersection of the second leading edge and the first connecting piece circumferential side surface is B2. The range of the included angle B1 is 10 degrees - 80 degrees. The inclination or bending direction of the second leading edge is opposite to the fan rotation direction, and the inclination direction of the second bottom edge is opposite to the inclination direction of the first bottom edge.

[0013] Further, the second air guide vane includes a third top edge, a third bottom edge, a third leading edge, and a third trailing edge in the circumferential direction. The third bottom edge is connected to the circumferential side surface of the second connecting member, the third top edge is connected to the circumferential side surface of the annular member, the third leading edge is away from the air outlet end, the third trailing edge is close to the air outlet end, the third leading edge is inclined or bent in the radial direction with respect to the second connecting member, and the inclination or bending direction of the third leading edge is the same as the rotation direction of the fan.

[0014] Further, the fan is provided with a first convex post, the first connecting member is provided with a second convex post, the second convex post is provided with a first shaft hole, the first convex post is connected in a matching manner with the first shaft hole, the first connecting member is provided with a second shaft hole, the second connecting member is provided with a third convex post, and the third convex post is connected in a matching manner with the second shaft hole.

[0015] A hand-held fan includes the air supply device described above.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] The fan blade, the first air guide vane, and the second air guide vane are inclined or bent axially and / or radially, and the inclination or bending direction of the fan blade is opposite to that of the first air guide vane, and the inclination or bending direction of the second air guide vane is opposite to that of the first air guide vane. Such a setting can reduce the disorder of the air flow and the loss in the radial direction, reduce the air duct area of the air flow, and achieve the effect of increasing the wind speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic diagram a of the overall structure of the air supply device of a hand-held fan of the utility model;

[0020] Figure 2 It is a schematic diagram b of the overall structure of the air supply device of a hand-held fan of the utility model;

[0021] Figure 3 It is Figure 1 an exploded view;

[0022] Figure 4 It is Figure 3 a schematic diagram a of the fan structure in

[0023] Figure 5 It isFigure 3 Schematic diagram b of the middle air blower structure;

[0024] Figure 6 is Figure 3 Schematic diagram c of the middle air blower structure;

[0025] Figure 7 is Figure 3 Schematic diagram d of the middle air blower structure;

[0026] Figure 8 is Figure 3 Schematic diagram e of the middle air blower structure;

[0027] Figure 9 is Figure 3 Schematic diagram f of the middle air blower structure;

[0028] Figure 10 is Figure 3 Schematic diagram g of the middle air blower structure;

[0029] Figure 11 is Figure 3 Schematic diagram a of the middle main support structure;

[0030] Figure 12 is Figure 3 Schematic diagram b of the middle main support structure;

[0031] Figure 13 is Figure 3 Schematic diagram c of the middle main support structure;

[0032] Figure 14 is Figure 3 Schematic diagram d of the middle main support structure;

[0033] Figure 15 is Figure 3 Partial sectional view schematic diagram a of the middle main support structure;

[0034] Figure 16 is Figure 3 Partial sectional view schematic diagram b of the middle main support structure;

[0035] Figure 17 is Figure 3 Schematic diagram a of the middle second air guiding member structure;

[0036] Figure 18 is Figure 3 Schematic diagram b of the middle second air guiding member structure;

[0037] Figure 19 is Figure 3 Schematic diagram c of the middle second air guiding member structure;

[0038] Figure 20 is Figure 3 Schematic diagram d of the middle second air guiding member structure;

[0039] Figure 21 For Figure 3 the schematic diagram e of the second air guiding member structure in

[0040] Figure 22 For Figure 3 the schematic diagram of the third air guiding member structure in

[0041] Figure 23 For Figure 3 the schematic diagram of the first air guiding member and the second air guiding member structures in

[0042] Figure 24 For Figure 3 the schematic diagram of the fan and the first air guiding member in Detailed implementation manners

[0043] In order to make the technical means, creative features, achieved purposes and functions implemented by the present utility model easy to understand, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0044] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance.

[0045] As Figure 1 - 24 shown, a blowing device of a hand-held fan according to the present utility model includes: a fan 1, a main body bracket 2, a first air guiding member 3, a second air guiding member 4, and a third air guiding member 5. Now, detailed descriptions of them will be given respectively:

[0046] For the fan 1, it includes a hub 11 and fan blades 12. The fan blades 12 and the hub 11 are detachably connected or integrally formed. The number of the fan blades 12 is more than three and they are evenly distributed on the circumferential side surface of the hub 11. The shape of the hub 11 is cylindrical, one end has a closed bottom surface, and the other end is open. A concave cavity 111 is provided in the opening, and a motor 13 is installed in the concave cavity 111. The motor 13 is electrically connected to the fan 1, and after the motor 13 is powered on, it drives the fan 1 to rotate.

[0047] Specifically, the shape of the hub 11 can be set such that the front section is straight cylindrical and the rear section is a tapered shape that slopes downward. For a hub 11 with such a shape, when the fan blades 12 are correspondingly connected to the circumferential side surface of the hub 11, it helps with the diversion of the air flow.

[0048] For the main body bracket 2, it has a straight cylindrical shape with openings at both ends and a hollow accommodation cavity 21 inside. The two ends of the main body bracket 2 are respectively an air inlet end 22 and an air outlet end 23. The fan 1 is installed inside the accommodation cavity 21, and the air flow enters from the air inlet end 22, passes through the fan 1, and is blown out from the air outlet end 23.

[0049] For the first air guiding member 3, the first air guiding member 3 is arranged inside the accommodation cavity 21. Specifically, the position is close to the air outlet end 23. It can be flush with the end surface of the air outlet end 23 or be at a certain distance from the air outlet end 23. The first air guiding member 3 is integrally formed with or detachably connected to the main body bracket 2.

[0050] Specifically, the first air guiding member 3 includes a first connecting member 31 and first air guiding vanes 32. The first connecting member 31 is annular. One end of the first air guiding vane 32 is connected to the first connecting member 31, and the other end is connected to the main body bracket 2. That is, the first air guiding vanes 32 are arranged between the first connecting member 31 and the inner side surface of the main body bracket 2. The number of the first air guiding vanes 32 is more than three and is evenly distributed on the circumferential side surface of the first connecting member 31.

[0051] For the second air guiding member 4, the second air guiding member 4 is connected to the air outlet end 23 of the main body bracket 2 and is adjacently connected to the first air guiding member 3. The second air guiding member 4 includes a second connecting member 41, second air guiding vanes 42, and an annular member 43. The second air guiding vanes 42 are connected between the second connecting member 41 and the annular member 43. The number of the second air guiding vanes 42 is more than three and is evenly distributed on the circumferential side surface of the second connecting member 41.

[0052] For the third air guiding member 5, the third air guiding member 5 is connected to the second air guiding member 4. Specifically, it is connected to the end of the second air guiding member 4 that is far from the main body bracket 2. That is, along the direction of the air flow being blown out, there are successively connected the fan 1, the first air guiding member 3, the second air guiding member 4, and the third air guiding member 5. The air flow enters from the air inlet end 22, passes through the fan 1, the air outlet end 23, the first air guiding member 3, the second air guiding member 4, and the third air guiding member 5 and then is blown out. When the air flow is blown out from the fan 1, it is first accelerated by the first air guiding member 3, second accelerated by the second air guiding member 4, and third accelerated by the third air guiding member 5. Through three accelerations, the wind blown out by the air supply device of the hand-held fan has a significantly increased wind speed compared to the hand-held fan under the same conditions, especially when the rotational speed of the motor 13 is the same. In particular, for the cost of the motor 13, it can be significantly reduced because even when using a motor 13 with a normal rotational speed, the wind speed can be comparable to that of a high-speed motor 13.

[0053] Specifically, the third air guiding member 5 includes a third connecting member 51 and an air guiding plate 52. The third connecting member 51 is annular with a hollow middle part, and the diameter of the third connecting member 51 is the same as the diameters of the annular member 43 and the main body bracket 2.

[0054] Specifically, the air guiding plate 52 is formed by inward extension from the inner side surface of the third connecting member 51. The air guiding plate 52 is annular, inclined in the air blowing direction, and is provided with a reduced diameter opening 521. The diameter of the reduced diameter opening 521 is smaller than the outer diameter of the third connecting member 51. The air flow blows out from the reduced diameter opening 521. By setting the reduced diameter opening 521 with a smaller diameter, the cross-sectional area of the air duct becomes smaller when the air flow passes through the third connecting member 51, and the air speed increases.

[0055] Regarding the connection method between the fan 1 and the first air guiding member 3, the second air guiding member 4, and the third air guiding member 5, the fan 1 is provided with a first convex post 14. Specifically, it is provided on the bottom surface of the hub 11 of the fan 1 and extends inwardly towards the concave cavity 111. One end of the first connecting member 31 is provided with a second convex post 311. The second convex post 311 is located in the receiving cavity 21 and extends towards the air inlet end 22. A first shaft hole 312 is provided on the second convex post 311. When the fan 1 is installed in the receiving cavity 21 of the main body bracket 2, the first convex post 14 of the fan 1 and the first shaft hole 312 of the first connecting member 31 are connected in a mating manner. The other end of the first connecting member 31 is provided with a second shaft hole 313. One end of the second connecting member 41 is provided with a third convex post 411. When the second connecting member 41 is connected to the first connecting member 31, it is connected in a mating manner through the third convex post 411 and the second shaft hole 313.

[0056] Specifically, when the air supply device is assembled, the central axis of the hub 11, the central axes of the first connecting member 31, the second connecting member 41, and the third connecting member 51 are on the same straight line, and the whole is in a straight cylindrical shape, which is conducive to the stable blowing of the air flow.

[0057] A detailed description is now given of the first air guiding blades 32 of the first air guiding member 3, the second air guiding blades 42 of the second air guiding member 4, and the fan blades 12 of the fan 1:

[0058] For the fan blade 12, the fan blade 12 circumferentially includes a first top edge 121, a first bottom edge 122, a first leading edge 123, and a first trailing edge 124. They enclose the contour of the fan blade 12, which is quadrilateral. The first top edge 121 and the first bottom edge 122 are opposite to each other, the first leading edge 123 and the first trailing edge 124 are opposite to each other. The first bottom edge 122 is connected to the circumferential side surface of the hub 11. The first top edge 121 is located at the end of the fan blade 12 away from the hub 11. The first leading edge 123 is close to the air outlet end 23, and the first trailing edge 124 is close to the air inlet end 22. The first bottom edge 122 is inclined relative to the central axis of the hub 11, and the included angle between the direction of the first bottom edge 122 and the direction of the central axis of the hub 11 is A1, and the range of the included angle A1 is 15 degrees - 75 degrees. The first leading edge 123 is inclined or bent relative to the radial direction of the hub 11, and the included angle between the direction of the first leading edge 123 and the radial direction at the intersection of the first leading edge 123 and the circumferential side surface of the hub 11 is A2, and the range of the included angle A2 is 15 degrees - 75 degrees. The inclination or bending direction of the first leading edge 123 is the same as the rotation direction of the fan 1.

[0059] Specifically, the central axis of the hub 11 is a1, the straight line where the first bottom edge 122 is located is b1, the included angle between a1 and b1 is A1. The intersection of the first leading edge 123 and the circumferential side surface of the hub 11 is o1, the straight line where the diameter of the hub 11 is located is c1, c1 passes through o1, the straight line where the first leading edge 123 is located is d1, and the included angle between c1 and d1 is A2.

[0060] For the first air guiding vane 32, the first air guiding vane 32 circumferentially includes a second top edge 321, a second bottom edge 322, a second leading edge 323, and a second trailing edge 324. They enclose the contour of the first air guiding vane 32, which is quadrilateral. The second top edge 321 and the second bottom edge 322 are opposite to each other, the second leading edge 323 and the second trailing edge 324 are opposite to each other. The second bottom edge 322 is connected to the circumferential side surface of the first connecting member 31. The second top edge 321 is connected to the inner side surface of the main body bracket 2. The second leading edge 323 is close to the air outlet end 23, and the second trailing edge 324 is close to the air inlet end 22. The second bottom edge 322 is inclined relative to the central axis of the first connecting member 31, and the included angle between the direction of the second bottom edge 322 and the direction of the central axis of the first connecting member 31 is B1, and the range of the included angle B1 is 10 degrees - 80 degrees. The second leading edge 323 is inclined or bent relative to the radial direction of the first connecting member 31, and the included angle between the direction of the second leading edge 323 and the radial direction at the intersection of the second leading edge 323 and the circumferential side surface of the first connecting member 31 is B2, and the range of the included angle B2 is 10 degrees - 80 degrees.

[0061] Specifically, the central axis of the first connecting member 31 is a2, the straight line where the second bottom edge 322 is located is b2, the included angle between a2 and b2 is B1. The intersection of the second leading edge 323 and the circumferential side surface of the first connecting member 31 is o2, the straight line where the diameter of the first connecting member 31 is located is c2, c2 passes through o2, the straight line where the second leading edge 323 is located is d2, and the included angle between c2 and d2 is B2.

[0062] Specifically, the second leading edge 323 is inclined or bent in a direction opposite to the rotation direction of the fan 1, and the inclination direction of the second bottom edge 322 is opposite to the inclination direction of the first bottom edge 122. That is, in the radial and / or axial directions, the bending or inclination directions of the fan blade 12 and the first air guiding vane 32 are opposite, so that the fan blade 12 and the first air guiding vane 32 are staggered axially. The effect of this setting is that the air duct between the fan 1 and the first air guiding vane 32 becomes smaller and the wind speed increases. More importantly, when the fan 1 rotates, a first wind field will be generated, and the air flow passing through the first air guiding vane 32 will generate a corresponding second wind field. Since their inclination or bending directions are opposite, the first wind field and the second wind field will interact with each other, effectively weakening the radial component of the air flow on the surfaces of the fan blade 12 and the first air guiding vane 32, so that the air flow can be gathered towards the axial direction as much as possible, reducing the radial loss of the air flow on the fan blade 12 and the first air guiding vane 32, improving the working efficiency of the fan 1, increasing the air pressure and air volume of the fan 1 to a certain extent, and achieving the effect of increasing the wind speed.

[0063] Specifically, the axial inclination of the fan blade 12 and the first air guiding vane 32 will also affect the angles of their respective air flow entering and exiting. Due to the axial inclination of the fan blade 12 and the first air guiding vane 32, the angles of their respective air flow entering and exiting will change, and the inclination directions are opposite. This setting can increase the air delivery volume and the air delivery distance, thus achieving the effect of increasing the wind speed.

[0064] For the second air guiding vane 42, the second air guiding vane 42 includes a third top edge 421, a third bottom edge 422, a third leading edge 423, and a third trailing edge 424 in the circumferential direction. They enclose the contour of the second air guiding vane 42, which is quadrilateral. The third top edge 421 and the third bottom edge 422 are opposite, the third leading edge 423 and the third trailing edge 424 are opposite. The third bottom edge 422 is connected to the circumferential side surface of the second connecting member 41, the third top edge 421 is connected to the circumferential side surface of the annular member 43, the third leading edge 423 is far from the air outlet end 23, and the third trailing edge 424 is close to the air outlet end 23.

[0065] The third bottom edge 422 is inclined or parallel to the central axis of the second connecting member 41. The included angle between the direction of the second bottom edge 322 and the central axis direction of the first connecting member 31 is C1, and the range of the included angle C1 is 0 degrees - 90 degrees. When C1 is 0 degrees, that is, the third bottom edge 422 is parallel to the central axis of the second connecting member 41, the third leading edge 423 is inclined or bent relative to the radial direction of the first connecting member 31, and the included angle between the direction of the third leading edge 423 and the radial direction at the intersection of the third leading edge 423 and the circumferential side surface of the second connecting member 41 is C2, and the range of the included angle C1 is 10 degrees - 80 degrees. The inclination or bending direction of the third leading edge 423 is the same as the rotation direction of the fan 1.

[0066] Specifically, the central axis of the second connecting member 41 is a3, the straight line where the third bottom edge 422 is located is b3, the included angle between a3 and b3 is C1, the intersection of the third front edge 423 and the circumferential side surface of the second connecting member 41 is o3, the straight line where the diameter of the second connecting member 41 is located is c3, c3 passes through o3, the straight line where the third front edge 423 is located is d3, and the included angle between c3 and d3 is C2.

[0067] Specifically, in the speed increasing process of the second air guiding member 4, the principle is the same as that of the first air guiding member 3. The inclination orientation of the second air guiding vane 42 in the radial and / or axial directions is opposite to that of the first air guiding vane 32. The air flow will form a corresponding third wind field in the second air guiding vane 42, and the second risk and the third wind field interact with each other to achieve the effect of increasing the wind speed.

[0068] Specifically, since the air flow only needs to pass through the third air guiding member 5 after being blown out from the second air guiding member 4, and the third air guiding member 5 has no air guiding vanes, therefore, the second air guiding vane 42 can be set to only have a radial inclination and no axial inclination, that is, the third front edge 423 is inclined or bent, and the third bottom edge 422 is parallel to the central axis of the second connecting member 41. After such a setting, when the air flow passes through the second air guiding member 4, it is basically blown out as a parallel air flow, which makes the user experience better. And because the second air guiding vane 42 is radially inclined and has an opposite inclination direction to the first air guiding vane 32, it still has the effect of increasing the wind speed.

[0069] Specifically, a guide post 44 is provided on the side of the second connecting member 41 away from the air outlet end 23. The guide post 44 is hemispherical. The setting of the guide post 44 makes the air flow more stable after being blown out.

[0070] Specifically, the sizes of the fan blade 12, the first air guiding vane 32, and the second air guiding vane 42 can be limited. The maximum distance of the fan blade 12 in the axial direction is L1, and the range of L1 is 10 mm - 100 mm; the maximum distance of the first air guiding vane 32 in the axial direction is L2, and the range of L2 is 10 mm - 100 mm; the maximum distance of the second air guiding vane 42 in the axial direction is L3, and the range of L3 is 10 mm - 100 mm; the maximum distance of the fan blade 12 in the radial direction is L4, and the range of L4 is 10 mm - 300 mm; the maximum distance of the first air guiding vane 32 in the radial direction is L5, and the range of L5 is 10 mm - 300 mm; the maximum distance of the second air guiding vane 42 in the radial direction is L6, and the range of L6 is 10 mm - 300 mm.

[0071] Regarding the range limitations of the respective angles and maximum distances of the fan blades 12, the first air guide vane 32, and the second air guide vane 42, since the parameters such as the respective angles and maximum distances of the fan blades 12, the first air guide vane 32, and the second air guide vane 42 are different, the respective generated wind fields are different, and the effects of the interaction between the wind fields will be different. Therefore, when the angle is inclined within the above-defined range and the maximum distance is within the above-defined range, the wind fields of the fan blades 12, the first air guide vane 32, and the second air guide vane 42 can cooperate with each other, and the effect of the interaction is better, and the effect of increasing the wind speed is better.

[0072] Preferably, the present invention provides a hand-held fan, including the air supply device of the above-mentioned hand-held fan.

[0073] Specifically, for the hand-held fan, it further includes a handle assembly connected to the air supply device. The handle assembly is provided with control buttons, a power supply, and a control circuit board. The control circuit board, the power supply, and the control buttons are electrically connected to the motor 13 of the air supply device.

[0074] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An air supply device, characterized in that, Comprising: A fan, the fan includes a hub and fan blades, the hub is provided with a concave cavity, a motor is installed in the concave cavity, the motor is electrically connected to the fan, at least part of the fan blades is inclined or bent, and the inclination or bending direction is the same as the rotation direction of the fan; A main body bracket, the main body bracket is in a straight cylindrical shape, has a receiving cavity inside, and the two ends are respectively an air inlet end and an air outlet end, and the fan is installed in the receiving cavity; A first air guiding member, the first air guiding member is arranged in the receiving cavity and is located at one end close to the air outlet end, the first air guiding member includes a first connecting member and a first air guiding blade, the first connecting member is in a ring shape, one end of the first air guiding blade is connected to the first connecting member, and the other end is connected to the main body bracket, at least part of the first air guiding blade is inclined or bent, and the inclination or bending direction is opposite to the rotation direction of the fan; A second air guiding member, the second air guiding member is connected to one end of the main body bracket close to the air outlet end and is adjacently connected to the first air guiding member, the second air guiding member includes a second connecting member, a second air guiding blade, and an annular member, the second air guiding blade is connected between the second connecting member and the annular member, at least part of the second air guiding blade is inclined or bent, and the inclination or bending direction is the same as the rotation direction of the fan.

2. The air supply device according to claim 1, wherein A flow guiding column is provided on the side of the second connecting member away from the air outlet end, and the flow guiding column is in a hemispherical shape.

3. The air supply device according to claim 1, wherein, The maximum distance of the fan blade in the axial direction is L1, and the range of L1 is 10 mm - 100 mm; the maximum distance of the first air guiding blade in the axial direction is L2, and the range of L2 is 10 mm - 100 mm; the maximum distance of the second air guiding blade in the axial direction is L3, and the range of L3 is 10 mm - 100 mm.

4. The air supply device according to claim 1, characterized in that, It further includes a third air guiding member, the third air guiding member is connected to the end of the second air guiding member away from the main body bracket, the third air guiding member includes a third connecting member and a wind guiding plate, the wind guiding plate is formed by the inner side surface of the third connecting member extending inwards, the wind guiding plate is in a ring shape, is inclined along the air flow blowing direction, and is provided with a reduced opening, and the outer diameter of the reduced opening is smaller than the outer diameter of the third connecting member.

5. The air supply device according to claim 4, characterized in that, The central axis of the hub, the central axis of the first connecting member, the central axis of the second connecting member, and the central axis of the third connecting member are located on the same straight line.

6. The air supply device according to claim 5, characterized in that, The fan blade circumferentially includes a first top edge, a first bottom edge, a first leading edge, and a first trailing edge. The first bottom edge is connected to the circumferential side surface of the hub. The first top edge is located at the end of the fan blade away from the hub. The first leading edge is close to the air outlet end. The first trailing edge is close to the air inlet end. The first bottom edge is inclined relative to the hub central axis, and the angle between the direction of the first bottom edge and the hub central axis direction is A1. The range of the angle A1 is 15 degrees - 75 degrees. The first leading edge is inclined or bent relative to the hub radial direction, and the angle between the direction of the first leading edge and the radial direction at the intersection of the first leading edge and the hub circumferential side surface is A2. The range of the angle A2 is 15 degrees - 75 degrees. The inclination or bending direction of the first leading edge is the same as the fan rotation direction.

7. The air supply device according to claim 6, wherein The first air guide vane circumferentially includes a second top edge, a second bottom edge, a second leading edge, and a second trailing edge. The second bottom edge is connected to the circumferential side surface of the first connecting member. The second top edge is connected to the inner side surface of the main body bracket. The second leading edge is close to the air outlet end. The second trailing edge is close to the air inlet end. The second bottom edge is inclined relative to the first connecting member central axis, and the angle between the direction of the second bottom edge and the first connecting member central axis direction is B1. The range of the angle B1 is 10 degrees - 80 degrees. The second leading edge is inclined or bent relative to the first connecting member radial direction, and the angle between the direction of the second leading edge and the radial direction at the intersection of the second leading edge and the first connecting member circumferential side surface is B2. The range of the angle B1 is 10 degrees - 80 degrees. The inclination or bending direction of the second leading edge is opposite to the fan rotation direction, and the inclination direction of the second bottom edge is opposite to the inclination direction of the first bottom edge.

8. The air supply device according to claim 7, characterized in that, The second air guide vane circumferentially includes a third top edge, a third bottom edge, a third leading edge, and a third trailing edge. The third bottom edge is connected to the circumferential side surface of the second connecting member. The third top edge is connected to the circumferential side surface of the annular member. The third leading edge is away from the air outlet end. The third trailing edge is close to the air outlet end. The third leading edge is inclined or bent relative to the second connecting member radial direction, and the inclination or bending direction of the third leading edge is the same as the fan rotation direction.

9. The air supply device according to any one of claims 1-8, characterized in that, The fan is provided with a first convex post. The first connecting member is provided with a second convex post. The second convex post is provided with a first shaft hole. The first convex post is connected with the first shaft hole in a matching manner. The first connecting member is provided with a second shaft hole. The second connecting member is provided with a third convex post. The third convex post is connected with the second shaft hole in a matching manner.

10. A handheld fan, characterized in that, It includes the air supply device according to any one of claims 1 - 9.

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