Air supply device capable of increasing air speed and handheld fan

Abstract

The utility model discloses an air supply device capable of increasing air speed. A main body bracket; a first air guide member; a second air guide member; a third air guide member; the third air guide piece is connected to the end, away from the main body support, of the second air guide piece, the third air guide piece comprises a third connecting piece and an air guide plate, the inner side face of the third connecting piece extends inwards to form the air guide plate, the air guide plate is annular, the air guide plate is gradually reduced in the air flow blowing-out direction, and a necking opening is formed in the end of the air guide plate. The outer diameter of the necking opening is smaller than that of the third connecting piece, and by arranging the air guide plate and the necking opening, the air speed is increased when the air flow passes through the third connecting piece; the air deflector is arranged to be annular and inclined in the air flow blowing-out direction, the necking opening is formed in the end, the outer diameter of the necking opening is smaller than that of the third connecting piece, and when air flow passes through the third connecting piece, 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 for increasing the wind speed. Background Art

[0002] In the hot summer, fans have become essential items for people to eliminate the heat. Along with 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 size, 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. Summary of the Utility Model

[0004] In order to solve the deficiencies in the prior art, an air supply device and a hand-held fan for increasing the wind speed 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 for increasing the wind speed includes: a fan, the fan includes a hub and fan blades, the hub is provided with a concave cavity, and a motor is installed in the concave cavity, and the motor is electrically connected to the fan; a main body bracket, the main body bracket is in a straight cylinder shape, with 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 piece, the first connecting member is in a ring shape, and 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; 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 connected adjacent 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, and the second air guiding piece is connected between the second connecting member and the annular member; a third air guiding member, the third air guiding member is connected to one end of the second air guiding member far 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 and gradually decreases along the air flow blowing direction and forms a constriction at the end, and the outer diameter of the constriction is smaller than the outer diameter of the third connecting member. By setting the wind guiding plate and the constriction, when the air flow passes through the third connecting member, the wind speed increases.

[0007] Further, the air flow enters from the air inlet end, passes through the fan, the air outlet end, the first air guiding member, the second air guiding member, and the third air guiding member and then blows out. When the air flow blows out from the fan and passes through the first air guiding member, it has a first-stage speed increase, when passing through the second air guiding member, it has a second-stage speed increase, and when passing through the third air guiding member, it has a third-stage speed increase.

[0008] Further, 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] Further, the maximum distance of the fan blade in the radial direction is L4, and the range of L4 is 10 mm - 300 mm; the maximum distance of the first air guiding piece in the radial direction is L5, and the range of L5 is 10 mm - 300 mm; the maximum distance of the second air guiding piece in the radial direction is L6, and the range of L6 is 10 mm - 300 mm.

[0010] Further, 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.

[0011] Further, 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 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 with respect to the central axis of the hub, and the angle between the direction of the first bottom edge and the direction of the central axis of the hub is A1, and the range of the angle A1 is 15 degrees - 75 degrees. The first leading edge is inclined or bent with respect to the radial direction of the hub, 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 circumferential side surface of the hub is A2, and 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 rotation direction of the fan.

[0012] Furthermore, the first air deflector 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 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 central axis of the first connecting member, and the angle between the direction of the second bottom edge and the central axis direction of the first connecting member is B1. The range of the angle B1 is 10 degrees - 80 degrees. The second leading edge is inclined or bent relative to the radial direction of the first connecting member, 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 circumferential side surface of the first connecting member is B2. The range of the angle B2 is 10 degrees - 80 degrees. The inclination or bending direction of the second leading edge is opposite to the rotation direction of the fan. The inclination direction of the second bottom edge is opposite to the inclination direction of the first bottom edge.

[0013] Furthermore, the second air deflector 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 relative to the radial direction of 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] Furthermore, 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, and the third convex post is connected with the second shaft hole in a matching manner.

[0015] A hand-held fan includes the air supply device for increasing the wind speed as described above.

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

[0017] A wind guide plate extends inwards on the inner side surface of the third connecting member, and the wind guide plate is arranged in a ring shape and is inclined along the air flow blowing direction, and a constriction is formed at the end. The outer diameter of the constriction is smaller than the outer diameter of the third connecting member, that is, the outer diameter of the wind guide plate gradually decreases along the air outlet direction. When the air flow passes through the third connecting member, it has the effect of increasing the wind speed. Description of the Drawings

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

[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 explosion diagram;

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

[0023] Figure 5 It is Figure 3 a schematic diagram b of the structure of the middle fan;

[0024] Figure 6 It is Figure 3 a schematic diagram c of the structure of the middle fan;

[0025] Figure 7 It is Figure 3 a schematic diagram d of the structure of the middle fan;

[0026] Figure 8 It is Figure 3 a schematic diagram e of the structure of the middle fan;

[0027] Figure 9 It is Figure 3 a schematic diagram f of the structure of the middle fan;

[0028] Figure 10 It is Figure 3 a schematic diagram g of the structure of the middle fan;

[0029] Figure 11 It is Figure 3 a schematic diagram a of the structure of the main body bracket;

[0030] Figure 12 It is Figure 3 a schematic diagram b of the structure of the main body bracket;

[0031] Figure 13 It is Figure 3 a schematic diagram c of the structure of the main body bracket;

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

[0033] Figure 15 For Figure 3 Partial sectional schematic diagram a of the main body support structure;

[0034] Figure 16 For Figure 3 Partial sectional schematic diagram b of the main body support structure;

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

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

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

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

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

[0040] Figure 22 For Figure 3 Schematic diagram of the third air guiding member structure;

[0041] Figure 23 For Figure 3 Schematic diagram of the first air guiding member and the second air guiding member structure;

[0042] Figure 24 For Figure 3 Schematic diagram of the fan and the first air guiding member structure. Detailed implementation manners

[0043] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model 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 direction or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not 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, the air supply device of a hand-held fan described in the present utility model includes: a fan 1, a main body bracket 2, a first air guide member 3, a second air guide member 4, and a third air guide member 5. Now, a detailed description will be given to each of them:

[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 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, with one end having a closed bottom surface and the other end being open. An inner cavity 111 is provided in the opening, and a motor 13 is installed in the inner 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 conical and inclined downward. For this shape of the hub 11, when the fan blades 12 are correspondingly connected to the circumferential side surface of the hub 11, it helps to guide the air flow.

[0048] For the main body bracket 2, its shape is straight cylindrical, with both ends open and a receiving cavity 21 provided 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 in the receiving cavity 21, and the air flow enters from the air inlet end 22, passes through the fan 1, and blows out from the air outlet end 23.

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

[0050] Specifically, the first air guide member 3 includes a first connecting member 31 and first air guide vanes 32. The first connecting member 31 is annular. One end of the first air guide 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 guide vane 32 is arranged between the first connecting member 31 and the inner side surface of the main body bracket 2. The number of the first air guide vanes 32 is more than three and they are 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 they are 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 connected to one end of the second air guiding member 4 away from the main body bracket 2. That is, the blower 1, the first air guiding member 3, the second air guiding member 4, and the third air guiding member 5 are connected in sequence along the direction of the airflow blowing out. The airflow enters from the air inlet end 22, passes through the blower 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 blows out. When the airflow blows out from the blower 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 times of acceleration, the wind blown out by the air supply device of the handheld fan has a significantly increased wind speed compared with a handheld fan under the same conditions, especially when the rotational speed of the motor 13 is the same. In particular, in terms of the cost of the motor 13, it can be significantly reduced because even if an ordinary rotational speed motor 13 is used, the wind speed can be comparable to that of a high rotational speed motor 13.

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

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

[0055] Regarding the connection method between the fan 1 and the first air guide member 3, the second air guide member 4, and the third air guide member 5, the fan 1 is provided with a first convex post 14, specifically, it is arranged on the bottom surface of the hub 11 of the fan 1 and extends towards the inside of 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 accommodating 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 accommodating cavity 21 of the main body bracket 2, the first convex post 14 of the fan 1 is connected in cooperation with the first shaft hole 312 of the first connecting member 31. 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 cooperation 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 axis of the first connecting member 31, the central axis of the second connecting member 41, and the central axis of the third connecting member 51 are on the same straight line, and the whole is in a straight cylinder shape, which is beneficial to the stable blowing of air flow.

[0057] The first air guide blades 32 of the first air guide member 3, the second air guide blades 42 of the second air guide member 4, and the fan blades 12 of the fan 1 will be described in detail as follows:

[0058] Regarding the fan blade 12, the fan blade 12 includes a first top edge 121, a first bottom edge 122, a first leading edge 123, and a first trailing edge 124 in the circumferential direction. They enclose the contour of the fan blade 12, which is in a quadrilateral shape. 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 where the first bottom edge 122 is located 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 where the first leading edge 123 is located 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 guide vane 32, the first air guide vane 32 includes a second top edge 321, a second bottom edge 322, a second front edge 323, and a second rear edge 324 in the circumferential direction. They enclose the contour of the first air guide vane 32, which is quadrilateral. The second top edge 321 and the second bottom edge 322 are opposite to each other, the second front edge 323 and the second rear 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 front edge 323 is close to the air outlet end 23, the second rear 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 where the second bottom edge 322 is located and the central axis direction of the first connecting member 31 is B1, and the range of the included angle B1 is 10 degrees - 80 degrees. The second front edge 323 is inclined or bent relative to the radial direction of the first connecting member 31, and the included angle between the direction where the second front edge 323 is located and the radial direction at the intersection of the second front 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 front 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 front edge 323 is located is d2, and the included angle between c2 and d2 is B2.

[0062] Specifically, the inclination or bending direction of the second front edge 323 is 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 guide vane 32 are opposite. As a result, the fan blade 12 and the first air guide vane 32 are axially staggered. The effect of such a setting is that the air duct between the fan 1 and the first air guide vane 32 becomes smaller and the air velocity increases. More importantly, when the fan 1 rotates, it will generate a first air field, and the air flow passing through the first air guide vane 32 will generate a corresponding second air field. Since their inclination or bending directions are opposite, the first air field and the second air field will interact with each other, which can effectively weaken the radial component of the air flow on the surfaces of the fan blade 12 and the first air guide vane 32, so that the air flow is gathered as much as possible in the axial direction, reducing the loss of the air flow in the radial direction of the fan blade 12 and the first air guide 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 air velocity.

[0063] Specifically, the fan blades 12 and the first air guide vanes 32 are inclined axially, which also affects the angles of the respective airflows entering and exiting. Since the fan blades 12 and the first air guide vanes 32 are inclined axially, the angles of the respective airflows entering and exiting will change, and the inclined directions are opposite. Such a setting can increase the air supply volume and enhance the air supply distance, thereby achieving the effect of increasing the wind speed.

[0064] For the second air guide vane 42, the second air guide vane 42 includes a third top edge 421, a third bottom edge 422, a third front edge 423, and a third rear edge 424 in the circumferential direction. They enclose the contour of the second air guide vane 42, which is quadrilateral. The third top edge 421 and the third bottom edge 422 are opposite to each other, the third front edge 423 and the third rear edge 424 are opposite to each other. 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 front edge 423 is away from the air outlet end 23, and the third rear 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 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 angle C1 is 0° - 90°. When C1 is 0°, that is, the third bottom edge 422 is parallel to the central axis of the second connecting member 41, the third front edge 423 is inclined or bent relative to the radial direction of the first connecting member 31, and the angle between the direction of the third front edge 423 and the radial direction at the intersection of the third front edge 423 and the circumferential side surface of the second connecting member 41 is C2, and the range of the angle C1 is 10° - 80°. The inclined or bent direction of the third front 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 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, and the straight line where the third front edge 423 is located is d3, and the angle between c3 and d3 is C2.

[0067] Specifically, the principle of the speed increase process of the second air guide member 4 is the same as that of the first air guide member 3. The inclined direction of the second air guide vane 42 in the radial and / or axial direction is opposite to that of the first air guide vane 32. The airflow will form a corresponding third air field in the second air guide vane 42, and the second air field and the third air field affect 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 blowing out from the second air guiding member 4, and the third air guiding member 5 has no air guiding vanes, the second air guiding vane 42 can be set to be only radially inclined and not axially inclined, that is, the third leading 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 provides a better user experience. And because the second air guiding vane 42 is radially inclined, and the inclination direction is opposite to that of 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 blades 12, the first air guiding vanes 32, and the second air guiding vanes 42 can be limited. The maximum axial distance of the fan blades 12 is L1, and the range of L1 is 10 mm - 100 mm; the maximum axial distance of the first air guiding vanes 32 is L2, and the range of L2 is 10 mm - 100 mm; the maximum axial distance of the second air guiding vanes 42 is L3, and the range of L3 is 10 mm - 100 mm; the maximum radial distance of the fan blades 12 is L4, and the range of L4 is 10 mm - 300 mm; the maximum radial distance of the first air guiding vanes 32 is L5, and the range of L5 is 10 mm - 300 mm; the maximum radial distance of the second air guiding vanes 42 is L6, and the range of L6 is 10 mm - 300 mm.

[0071] Regarding the range limitations of the respective included angles and maximum distances of the fan blades 12, the first air guiding vanes 32, and the second air guiding vanes 42, different parameters such as the respective included angles and maximum distances of the fan blades 12, the first air guiding vanes 32, and the second air guiding vanes 42 result in different wind fields, and the effects of the interaction between the wind fields will be different. Therefore, when the included 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 guiding vanes 32, and the second air guiding vanes 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 utility model provides a handheld fan, including the air supply device of the above - mentioned handheld fan.

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

[0074] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. An air supply device for increasing the wind speed, characterized in that, Comprising: 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, and the motor is electrically connected to the blower; A main body bracket, the main body bracket is in a straight cylinder shape, with a receiving cavity inside, and the two ends are respectively an air inlet end and an air outlet end, and the blower 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, and 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; 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, and the second air guiding blade is connected between the second connecting member and the annular member; A third air guiding member, the third air guiding member is connected to one end of the second air guiding member far 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, gradually decreases along the air flow blowing direction, and forms a constriction at the end, and the outer diameter of the constriction is smaller than the outer diameter of the third connecting member. By setting the wind guiding plate and the constriction, when the air flow passes through the third connecting member, the wind speed increases.

2. The air supply device for increasing the wind speed according to claim 1, wherein The air flow enters from the air inlet end, passes through the blower, the air outlet end, the first air guiding member, the second air guiding member, and the third air guiding member and then blows out. When the air flow blows out from the blower and passes through the first air guiding member, it is the first-stage speed increase, when passing through the second air guiding member, it is the second-stage speed increase, and when passing through the third air guiding member, it is the third-stage speed increase.

3. The air supply device for increasing the wind speed according to claim 2, characterized in that, The maximum distance of the fan blade in the axial direction is L1, and the range of L1 is 10mm - 100mm; the maximum distance of the first air guiding blade in the axial direction is L2, and the range of L2 is 10mm - 100mm; the maximum distance of the second air guiding blade in the axial direction is L3, and the range of L3 is 10mm - 100mm.

4. The air supply device for increasing the wind speed according to claim 3, wherein The maximum distance of the fan blade in the radial direction is L4, and the range of L4 is 10mm - 300mm; the maximum distance of the first air guiding blade in the radial direction is L5, and the range of L5 is 10mm - 300mm; the maximum distance of the second air guiding blade in the radial direction is L6, and the range of L6 is 10mm - 300mm.

5. The air supply device for increasing the wind speed 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 on the same straight line.

6. The air supply device for increasing the wind speed 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, and 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, and 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 for increasing the wind speed according to claim 6, wherein The first air guiding 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, and 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, and the range of the angle B2 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 for increasing the wind speed according to claim 7, characterized in that, The second air guiding 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 for increasing the wind speed 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 mating 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 mating manner.

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

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