Three-stage acceleration air supply device and handheld fan

Abstract

The utility model discloses a three-stage speed-increasing air supply device which comprises a fan, a speed-increasing device and a speed-increasing device. A main body bracket; the first air guide piece is arranged in the containing cavity and located at the end close to the air outlet end; the second air guide piece is connected to the end, close to the air outlet end, of the main body support; the third air guide part is connected to the end, away from the main body support, of the second air guide part, airflow enters from the air inlet end, and when the airflow is blown out of the draught fan and passes through the first air guide part, the airflow is in first-stage speed increase, and when the airflow passes through the second air guide part, the airflow is in second-stage speed increase; when the air passes through the third air guide piece, three-stage speed increase is achieved; according to the handheld fan, by arranging the first air guide piece, the second air guide piece and the third air guide piece, airflow is sequentially accelerated for three times after being blown out of the fan, so that the handheld fan has the effect of increasing the air speed in three stages.

Description

Technical Field

[0001] The utility model relates to the technical field of hand-held fans, in particular to an air supply device with three-stage speed increase and a hand-held fan. 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 existing hand-held fans, due to their small size, the air volume blown 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] To solve the deficiencies in the prior art, an air supply device with three-stage speed increase and a hand-held fan are provided, which have the effect of increasing the wind speed.

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

[0006] An air supply device with three-stage speed increase 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, 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; 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; 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, 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, and 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.

[0007] Further, 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.

[0008] Further, 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.

[0009] Further, the third air guiding member includes a third connecting member and an air guiding plate. The air guiding plate is formed by inward extension from the inner side surface of the third connecting member. The air guiding plate is annular, inclined along the air flow blowing direction, and is provided with a reduced opening. The outer diameter of the reduced opening is smaller than the outer diameter of the third connecting member.

[0010] Further, the hub central axis, 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 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 circumferential side surface of the hub 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.

[0012] Further, 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 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 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 guiding piece 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 fan rotation direction.

[0014] Furthermore, the blower 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 handheld fan includes the air supply device with three-stage speed increase described above.

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

[0017] By providing the first air guide member, the second air guide member, and the third air guide member, after the air flow blows out from the blower, it is increased in speed three times in sequence, so that the air supply device has the effect of increasing the wind speed in three stages. 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, 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 a three-stage speed-increasing air supply device of the utility model;

[0020] Figure 2 It is a schematic diagram b of the overall structure of a three-stage speed-increasing air supply device 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 blower structure in

[0023] Figure 5 It is Figure 3 a schematic diagram b of the blower structure in

[0024] Figure 6 It is Figure 3 a schematic diagram c of the blower structure in

[0025] Figure 7 It is Figure 3 a schematic diagram d of the blower structure in

[0026] Figure 8 It is Figure 3 a schematic diagram e of the blower structure in

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0043] In order to make the technical means, creative features, achieved purposes and effects realized 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 in conjunction with 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 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 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 therefore should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] As Figures 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 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 when 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 is helpful for the diversion of air flow.

[0048] For the main body bracket 2, its shape is straight cylindrical, with both ends open, and a receiving cavity 21 is 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 surface 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 each 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 vanes 32 are disposed 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 guide member 4, the second air guide member 4 is connected to the air outlet end 23 of the main body bracket 2 and is adjacent to the first air guide member 3. The second air guide member 4 includes a second connecting member 41, second air guide vanes 42, and an annular member 43. The second air guide vanes 42 are connected between the second connecting member 41 and the annular member 43. The number of the second air guide 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 guide member 5, the third air guide member 5 is connected to the second air guide member 4, specifically, it is connected to the end of the second air guide member 4 far from the main body bracket 2. That is, the blower 1, the first air guide member 3, the second air guide member 4, and the third air guide member 5 are sequentially connected along the direction of the airflow blown out. The airflow enters from the air inlet end 22, passes through the blower 1, the air outlet end 23, the first air guide member 3, the second air guide member 4, and the third air guide member 5 and then is blown out. When the airflow is blown out from the blower 1, it is first accelerated by passing through the first air guide member 3, second accelerated by passing through the second air guide member 4, and third accelerated by passing through the third air guide member 5. Through three times of acceleration, the wind blown out by the air supply device of the hand-held fan has a significantly increased wind speed compared with the hand-held 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 guide member 5 includes a third connecting member 51 and a guide plate 52. The third connecting member 51 is annular, with a hollow 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 guide plate 52 is formed by inward extension from the inner side surface of the third connecting member 51. The guide plate 52 is annular, inclined toward the direction of the airflow blown out, and is provided with a reduced opening 521. The diameter of the reduced opening 521 is smaller than the outer diameter of the third connecting member 51. The airflow is blown out from the reduced opening 521. By setting the reduced opening 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 and the first shaft hole 312 of the first connecting member 31 are connected in a matching 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 matching 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 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 cylindrical shape, which is conducive to the stable blowing of the air flow.

[0057] The first air guide vanes 32 of the first air guide member 3, the second air guide vanes 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 far 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 angle between the direction of the first bottom edge 122 and the central axis direction of the hub 11 is A1, and the range of the 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 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 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 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 angle between c1 and d1 is A2.

[0060] For the first air guiding vane 32, the first air guiding 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 guiding 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 of the second bottom edge 322 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 of the second front edge 323 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 B1 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 tilting or bending direction of the second front edge 323 is opposite to the rotation direction of the fan 1, and the tilting direction of the second bottom edge 322 is opposite to the tilting direction of the first bottom edge 122, that is, in the radial and / or axial directions, the bending or tilting 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 such a setting is that the air duct between the fan 1 and the first air guiding vane 32 becomes smaller and the air speed increases; more importantly, when the fan 1 rotates, a first air field is generated, and the air flow passing through the first air guiding vane 32 will generate a corresponding second air field. Since their tilting 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 guiding vane 32, so that the air flow gathers 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 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 air speed.

[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 orientations are opposite. Such a setting can increase the air supply volume and improve the air supply distance, thereby achieving the effect of increasing the wind speed.

[0064] For the second air guide vanes 42, the second air guide vanes 42 include 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 guide vanes 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 away 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 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 degree - 90 degrees. When C1 is 0 degree, 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 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 angle C1 is 10 degrees - 80 degrees. The inclined or bent orientation 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 angle between a3 and b3 is C1, the intersection of the third leading 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 leading 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 orientations of the second air guide vanes 42 in the radial and / or axial directions are opposite to those of the first air guide vanes 32. The airflows will form corresponding third wind fields in the second air guide vanes 42. The second wind field and the third wind field affect each other to achieve the effect of increasing the wind speed.

[0068] Specifically, after the air flow blows out from the second air guiding member 4, it only needs to pass through the third air guiding member 5, and the third air guiding member 5 has no air guiding vanes. Therefore, 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, providing a better user experience. Moreover, since the second air guiding vane 42 is radially inclined and has an inclination direction 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 limitations on the respective 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 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 mutual influence of the wind fields will be different. Therefore, when the angles are inclined within the above - defined range and the maximum distances are 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 mutual influence is better, and the effect of increasing the wind speed is better.

[0072] Preferably, the present utility model 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 foregoing 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-mentioned 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 for the present utility model is defined by the appended claims and their equivalents.

Claims

1. A three-stage speed-increasing 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, and the motor is electrically connected to the fan; A main body bracket, the main body bracket is in a straight cylindrical 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; 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; 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, air flows in 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 flows out from the fan 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.

2. The air supply device with three-stage speed increase according to claim 1, characterized in that, 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.

3. The three-stage speed-increasing air supply device according to claim 2, characterized in that, The second air guiding member includes a second connecting member, a second air guiding blade, and a ring-shaped member, and the second air guiding blade is connected between the second connecting member and the ring-shaped member.

4. The three-stage speed-increasing air supply device according to claim 3, characterized in that, The third air guiding member includes a third connecting member and a wind guiding plate, the wind guiding plate is formed by inward extension of the inner side surface of the third connecting member, the wind guiding plate is in a ring shape, is inclined along the air 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 with three-stage speed increase 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 with three-stage speed increase according to claim 5, characterized in that, The fan blades circumferentially include 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 central axis of the hub, and the included 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 included angle A1 is 15 degrees - 75 degrees, the first leading edge is inclined or bent relative to the radial direction of the hub, 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 circumferential side surface of the hub is A2, and the range of the included angle A2 is 15 degrees - 75 degrees, and the inclination or bending direction of the first leading edge is the same as the rotation direction of the fan.

7. The air supply device with triple speed increase according to claim 6, characterized in that, The first air guide vane circumferentially includes a second top edge, a second bottom edge, a second front edge, and a second rear 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 front edge is close to the air outlet end. The second rear 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 included angle between the direction of the second bottom edge and the direction of the central axis of the first connecting member is B1, and the range of the included angle B1 is 10 degrees to 80 degrees. The second front edge is inclined or bent relative to the radial direction of the first connecting member, and the included angle between the direction of the second front edge and the radial direction at the intersection of the second front edge and the circumferential side surface of the first connecting member is B2, and the range of the included angle B2 is 10 degrees to 80 degrees. The inclination or bending direction of the second front 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.

8. The air supply device with three-stage speed increase according to claim 7, characterized in that, The second air guide vane circumferentially includes a third top edge, a third bottom edge, a third front edge, and a third rear 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 front edge is away from the air outlet end. The third rear edge is close to the air outlet end. The third front edge is inclined or bent relative to the radial direction of the second connecting member, and the inclination or bending direction of the third front edge is the same as the rotation direction of the fan.

9. The air supply device with three-stage speed increase according to any one of claims 3-8, 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 three-stage speed-increasing air supply device according to any one of claims 1-9.

Images