Blowing device

Abstract

The utility model discloses a blowing device, which relates to the technical field of blowing devices and comprises an air outlet shell and a fan component, an air outlet duct, an air inlet and an air outlet are arranged in the air outlet shell, the air inlet and the air outlet are communicated with the air outlet duct, and the air outlet duct comprises a first air duct and a second air duct which are communicated with each other. The first air channel gradually shrinks from the end close to the air inlet to the end away from the air inlet and communicates with the air inlet. The second air duct is gradually expanded from one end close to the air inlet to one end far away from the air inlet and is communicated with the air outlet; the fan assembly is arranged in the air outlet shell so as to disturb airflow to flow from the air inlet to the air outlet. The first air duct in the air outlet shell gradually shrinks to gather airflow and strengthen wind power, and the second air duct gradually expands to smooth airflow flowing, so that the purposes of improving wind power and reducing wind noise are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a blowing device technical field, especially a blowing device. BACKGROUND

[0002] The blowing device is a device for generating and controlling airflow, usually including a fan assembly (fan and fan blade) and a shell, by installing the fan in the air outlet cavity in the shell, using the fan to drive the fan blade to rotate, the fan blade disturbs the air in the air outlet cavity to form an air outlet airflow, and the stable blowing of the blowing device is realized.

[0003] In the related art blowing device, the airflow entering from the air inlet of the shell is smooth, due to the rotation of the fan blade of the fan assembly, the airflow is disturbed, the airflow is disturbed by the edge of the fan blade to the inner wall of the air inlet of the blowing device, since the inner wall of the air inlet of the blowing device is horizontally arranged with the air inlet direction, the airflow will contact and rebound from the inner wall of the air inlet, thereby resulting in poor air inlet flow guiding effect and generating large wind noise. SUMMARY

[0004] The main purpose of the utility model is to provide a blowing device, which aims to solve the technical problem of wind noise generated by the inner wall of the air inlet of the blowing device in the related art.

[0005] To achieve the above purpose, the utility model provides a blowing device, which comprises:

[0006] An air outlet shell is provided with an air outlet air duct, an air inlet and an air outlet communicating with the air outlet air duct, the air outlet air duct further comprises a first air duct and a second air duct in communication, the first air duct gradually shrinks from one end close to the air inlet to one end away from the air inlet and communicates with the air inlet, and the second air duct gradually expands from one end close to the air inlet to one end away from the air inlet and communicates with the air outlet.

[0007] A fan assembly is arranged in the air outlet shell to disturb the airflow flowing from the air inlet to the air outlet.

[0008] In an embodiment, the air outlet air duct further comprises a third air duct, the third air duct communicates with the second air duct and the air outlet, and the fan assembly is arranged in the second air duct and the third air duct.

[0009] In an embodiment, the third air duct gradually expands from one end close to the air inlet to one end away from the air inlet.

[0010] Alternatively, the third air duct is arranged as a straight air duct.

[0011] In an embodiment, the inner wall of the first air duct is arc-shaped, the inner wall of the second air duct is arc-shaped, the inner wall of the first air duct is connected to the inner wall of the second air duct, and the inner wall of the first air duct and the inner wall of the second air duct form a continuous parabolic shape.

[0012] In an embodiment, the air outlet shell comprises:

[0013] A converging shell in which the first air duct and the second air duct are formed;

[0014] An air inlet cover connected to one end of the converging shell, the air inlet cover being formed with the air inlet at an end away from the converging shell;

[0015] An air outlet cover connected to the other end of the converging shell, the air outlet cover being provided with the air outlet, and the fan assembly being connected to the air outlet cover and extending into the converging shell.

[0016] In an embodiment, the inner cavity of the air inlet cover is gradually tapered from an end away from the air inlet to an end close to the air inlet;

[0017] And / or, the air inlet cover is arc-shaped at the edge of the air inlet.

[0018] In an embodiment, the converging shell comprises a first shell connected to a second shell, the first shell being connected to the air inlet cover, the second shell being connected to the air outlet cover, the first shell being provided with the first air duct, and the second shell being provided with the second air duct.

[0019] In an embodiment, the air inlet cover comprises a first ring, an inner ring, and a first rib, the first ring being connected to the converging shell and surrounding the inner ring, the first rib being arranged between the first ring and the inner ring and connecting the first ring and the inner ring, and the first ring and the inner ring forming the air inlet therebetween;

[0020] And / or, the air outlet cover comprises a second ring, a mounting structure, and a second rib, the second ring being connected to the converging shell and surrounding the mounting structure, the mounting structure being connected to the fan assembly, the second rib being arranged between the second ring and the mounting structure and connecting the second ring and the mounting structure, and the second ring and the mounting structure forming the air outlet therebetween.

[0021] In an embodiment, the fan assembly further comprises a fan body and a fan blade, the fan blade comprising an inner hub, an outer hub, an inner blade and an outer blade; the inner hub is connected to the fan body, the outer hub is sleeved on the outer periphery of the inner hub and coaxially arranged with the inner hub, and the outer hub and the inner hub form an air inlet channel communicated with the air outlet channel; the outer blade is connected to the outer periphery of the outer hub, and the inner blade is arranged in the air inlet channel and connected to the outer hub and the inner hub respectively.

[0022] In an embodiment, the hair dryer further comprises an outer shell, the outer shell is sleeved on the outer periphery of the air outlet shell, and the outer shell extends along the side away from the air outlet shell to form a handle part.

[0023] The present application converges the airflow and strengthens the wind power through the gradual contraction of the first air channel in the air outlet shell, and smoothes the airflow through the gradual expansion of the second air channel, so as to improve the wind power and reduce the wind noise. By dividing the air outlet channel into the first air channel and the second air channel, the first air channel gradually contracts at the end close to the air inlet, which helps to form the airflow convergence effect; and the second air channel gradually expands at the end close to the air outlet, since the inner wall of the second air channel is not on the same horizontal line as the air inlet direction of the hair dryer, when the airflow disturbed by the fan assembly contacts the air outlet channel, the airflow can generate a certain oblique component force, so that the airflow can flow along the inner wall of the air outlet channel, which has a good flow guiding effect, compared with the flat inner wall, the airflow reflection can be reduced, the mutual collision of the air inlet airflow can be reduced, the wind power loss can be effectively reduced, and the technical effects of reducing the wind noise and further enhancing the air outlet wind power can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to the structures shown in these drawings without creative labor for those skilled in the art.

[0025] Figure 1 The structure sectional view of the hair dryer provided by the present application is provided.

[0026] Figure 2 The explosion view of the hair dryer provided by the present application is provided.

[0027] Figure 3 The structure schematic view of the air outlet shell provided by the present application is provided.

[0028] Figure 4 The structure schematic view of the fan assembly provided by the present application is provided.

[0029] Figure 5 The structure schematic view of the air inlet direction of the air blowing device is provided.

[0030] Explanation of the reference signs:

[0031] 1000, air blowing device; 1, air outlet shell; 11, air outlet air duct; 1a, first air duct; 1b, second air duct; 1c, third air duct; 12, air inlet; 13, air outlet; 14, flow collecting shell; 141, first shell; 142, second shell; 15, air inlet cover; 151, first ring body; 152, inner ring body; 153, first rib; 16, air outlet cover; 161, second ring body; 162, mounting structure; 163, second rib; 2, fan assembly; 21, fan body; 22, fan blade; 221, inner hub; 222, outer hub; 223, inner blade; 224, outer blade; 3, outer shell; 31, handle part.

[0032] The implementation, functional features and advantages of the utility model will be further described with reference to the drawings in combination with the embodiments. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0034] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears in the whole text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary technical personnel in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0036] The utility model provides a kind of blowing device 1000.

[0037] Please refer to Figures 1 to 5 In an embodiment of the utility model, the blowing device includes air outlet shell 1 and fan assembly 2, air outlet duct 11 and the air inlet 12 and the air outlet 13 that communicate air outlet duct 11 are equipped in air outlet shell 1, air outlet duct 11 includes the first air duct 1a and the second air duct 1b that are communicated, the first air duct 1a is gradually contracted from the end close to air inlet 12 to the end far from air inlet 12, and is communicated with air inlet 12;Second air duct 1b is gradually expanded from the end close to air inlet 12 to the end far from air inlet 12, and is communicated with air outlet 13;Fan assembly 2 is arranged in air outlet shell 1, to disturb airflow from air inlet 12 to flow towards air outlet 13.

[0038] In the embodiment, it can be understood that the blowing device can be electric fan, blower and the like application fan to generate wind force to work device. The blowing device includes air outlet shell 1 and fan assembly 2, the shape of the air outlet shell 1 includes but is not limited to cylindrical structure, and the connection relationship of fan assembly 2 and air outlet shell 1 includes but is not limited to injection molding mode. Correspondingly, air outlet duct 11 is used to guide airflow from air inlet 12 to air outlet 13, and the first air duct 1a and the second air duct 1b are part of the air duct in the air outlet shell 1. The opening inner wall of air inlet 12 and air outlet 13 is arc-shaped. Further, the chamber where the first air duct 1a is located and the chamber where the second air duct 1b is located can be connected by injection molding mode, in order to facilitate the demolding work of production, the demarcation line of the first air duct 1a and the second air duct 1b is taken as the mold opening line. It can be understood that, in combination with Figure 5 In the case of fan assembly 2 working, Figure 5The arrow in the figure points to the air flow direction of the air outlet shell 1 and the fan assembly 2, and the air flow can maintain a spiral flow trend from the air inlet 12 to the air outlet 13, passing through the first air duct 1a and the second air duct 1b. When passing through the first air duct 1a, the gradually narrowing arrangement of the first air duct 1a causes part of the air flow to flow inward from the edge of the air inlet 12, converging the air inlet flow and flowing along the wall of the air outlet shell 1, which is beneficial to improve the air flow speed after the fan disturbance. When the air flow continues to flow through the second air duct 1b, the gradually expanding arrangement of the second air duct 1b causes the air flow to flow more smoothly, reducing the deflection and vortex of the air flow in the air duct, thereby reducing the direct collision of the air flow with the inner wall of the second air duct 1b, thereby achieving the technical effect of reducing the wind noise. At the same time, the gradually expanding second air duct 1b helps to improve the wind power and wind speed of the air outlet, reduces the pressure loss of the air outlet flow in the air outlet duct 11, and thus improves the flow guiding efficiency of the second air duct 1b.

[0039] Therefore, in the present application, the hair dryer can converge the air flow and strengthen the wind power through the gradually narrowing first air duct 1a in the air outlet shell 1, and smooth the air flow through the gradually expanding second air duct 1b, thereby achieving the purpose of improving the wind power and reducing the wind noise. By dividing the air outlet duct 11 into the first air duct 1a and the second air duct 1b, the first air duct 1a gradually narrows at the end close to the air inlet 12, which helps to form a flow convergence effect for the air inlet flow. The second air duct 1b gradually expands at the end close to the air outlet 13. Since the inner wall of the second air duct 1b is not on the same horizontal line as the air inlet direction of the hair dryer, when the air flow disturbed by the fan assembly 2 contacts the air outlet duct 11, the air flow can generate a certain oblique component force, so that the air flow can flow along the inner wall of the air outlet duct 11, thereby achieving a good flow guiding effect. Compared with a flat inner wall, the air flow reflection can be reduced, the mutual collision of the air inlet flow can be reduced, the wind power loss can be effectively reduced, and the technical effects of reducing the wind noise and further enhancing the air outlet wind power can be achieved.

[0040] In combination with Figure 3 In an embodiment of the present application, the air outlet duct 11 further comprises a third air duct 1c, the third air duct 1c is in communication with the second air duct 1b and the air outlet 13, and the fan assembly 2 is arranged in the second air duct 1b and the third air duct 1c.

[0041] In the embodiment, the third air duct 1c is an air duct for realizing the air outlet function in the air outlet air duct 11, and the two ends of the third air duct 1c are communicated with the second air duct 1b and the air outlet 13 respectively. It can be understood that the fan assembly 2 is installed in the second air duct 1b and the third air duct 1c, and the inner wall of the second air duct 1b and the inner wall of the third air duct 1c are both arranged in a circular arc shape, which is convenient for guiding the airflow to pass through. Specifically, the fan assembly 2 can be arranged at the center of the second air duct 1b and the third air duct 1c, so as to reduce the vibration noise of the fan. In addition, the distribution of the airflow can be optimized, the deflection and vortex of the airflow in the air duct are reduced, the air resistance is reduced, and the air flow efficiency is improved.

[0042] In combination Figure 3 In an embodiment of the utility model, the third air duct 1c gradually expands from one end close to the air inlet 12 to one end away from the air inlet 12. Alternatively, the third air duct 1c is arranged in a straight air duct.

[0043] In the embodiment, the third air duct 1c is not limited to be arranged in an expanding trend or a straight trend. When the third air duct 1c is arranged in an expanding trend, the air outlet airflow diffuses outward, and the blowing range is enlarged. When the third air duct 1c is arranged in a straight trend, the air outlet airflow flows along the inner wall of the air outlet air duct 11, which is helpful for the airflow to flow along the air duct in a streamline shape, reduces the turbulence and vortex of the airflow, reduces the direct collision between the airflow and the inner wall of the third air duct 1c, reduces the flow resistance, and improves the blowing air power.

[0044] In an embodiment of the utility model, the inner wall of the first air duct 1a is arranged in an arc shape, the inner wall of the second air duct 1b is arranged in an arc shape, the inner wall of the first air duct 1a is connected with the inner wall of the second air duct 1b, and the inner wall of the first air duct 1a and the inner wall of the second air duct 1b are arranged in a continuous parabolic shape.

[0045] In the embodiment, the arc-shaped inner wall is helpful for reducing the reflection and superposition of sound waves on the inner wall of the air duct, so as to reduce the wind noise. Correspondingly, the inner wall of the first air duct 1a is arranged in a convex arc shape relative to the horizontal plane, so as to achieve the effect of converging the airflow. The inner wall of the second air duct 1b is arranged in a concave arc shape relative to the horizontal plane, so as to achieve the effect of reducing the deflection and vortex of the airflow in the air duct. It can be understood that the inner wall of the first air duct 1a and the inner wall of the second air duct 1b are arranged in a parabolic shape that is first contracted and then expanded, which reduces the deflection and vortex of the airflow in the air duct, reduces the direct collision between the airflow and the inner wall of the air duct, reduces the air resistance, and improves the flow efficiency of the air. At the same time, the continuous parabolic shape can make the flow line of the airflow on the inner wall of the air duct be a continuous arc line, avoid the uneven inner wall of the shell to cause the airflow to be blocked to a certain probability, and better improve the air outlet power.

[0046] In combination Figure 1 andFigure 2 In an embodiment of the present application, the air outlet shell 1 comprises a flow-converging shell 14, an air inlet cover 15 and an air outlet cover 16, the flow-converging shell 14 is formed with a first air duct 1a and a second air duct 1b; the air inlet cover 15 is connected to one end of the flow-converging shell 14, and the air inlet cover 15 is formed with an air inlet 12 at an end away from the flow-converging shell 14; the air outlet cover 16 is connected to the other end of the flow-converging shell 14, and the air outlet cover 16 is provided with an air outlet 13; and the fan assembly 2 is connected to the air outlet cover 16 and extends into the flow-converging shell 14.

[0047] In the embodiment, the air outlet shell 1 is composed of the flow-converging shell 14, the air inlet cover 15 and the air outlet cover 16; the air inlet cover 15 is detachably connected to the flow-converging shell 14 by screw connection, clamping or the like; and the air outlet cover 16 is detachably connected to the flow-converging shell 14 by clamping, bolt connection or the like, which is not limited herein, for example, one end of the flow-converging shell 14 is provided with a clamping groove for clamping the air inlet cover 15, and one end of the air inlet cover 15 is formed with a clamping block matched with the clamping groove. Such a detachable mode is convenient for subsequent disassembly and cleaning. Correspondingly, the air outlet cover 16 is provided with a clamping groove for limiting the fan assembly 2; and the fan assembly 2 can be connected to the air outlet cover 16 by screwing or flange, which is convenient for maintenance and cleaning.

[0048] In an embodiment of the present application, the inner cavity of the air inlet cover 15 is gradually tapered from an end away from the air inlet 12 to an end close to the air inlet 12; and / or the edge of the air inlet cover 15 at the air inlet 12 is arc-shaped.

[0049] In the embodiment, in order to further converge the airflow and strengthen the wind force, the inner cavity of the air inlet cover 15 is gradually tapered, so that the air inlet cover 15 can guide the airflow, reduce the turbulence and vortex at the air inlet 12, and reduce the wind noise. It can be understood that the arc-shaped edge is helpful to connect with the inner wall arc of the flow-converging shell 14, so as to reduce the noise generated by airflow impact, make the air inlet more smooth and smooth, and effectively reduce the wind noise.

[0050] In combination with Figure 2 and Figure 3 In an embodiment of the present application, the flow-converging shell 14 comprises a first shell 141 and a second shell 142 connected together, the first shell 141 is connected to the air inlet cover 15, and the second shell 142 is connected to the air outlet cover 16; the first shell 141 is provided with the first air duct 1a, and the second shell 142 is provided with the second air duct 1b.

[0051] In the embodiment, the first shell 141 and the second shell 142 can be connected by one-piece forming, or can be connected by clamping assembly after respective injection molding, so as to facilitate mold opening production. It can be understood that the boundary line of the first shell 141 and the second shell 142 is the actual mold opening line of production, further, the boundary line of the first shell 141 and the second shell 142 is actually the highest point of the arc parabola of the first air duct 1a and the second air duct 1b, so as to facilitate installation and demolding production. The connection between the first shell 141 and the air inlet cover 15 can be achieved by bolt connection, clamping and the like, and the connection between the second shell 142 and the air outlet cover 16 can be achieved by bolt connection, clamping and the like, so that the air flow can be effectively guided from the air inlet 12 to the air outlet 13, the turbulence and vortex of the air flow in the shell are reduced, and the technical effect of reducing wind noise is achieved.

[0052] In combination Figure 2 In an embodiment of the utility model, the air inlet cover 15 includes a first ring body 151, an inner ring body 152 and a first rib 153, the first ring body 151 is connected with the air flow shell 14 and is arranged around the inner ring body 152, the first rib 153 is arranged between the first ring body 151 and the inner ring body 152 and connects the first ring body 151 and the inner ring body 152, and the first ring body 151 and the inner ring body 152 form the air inlet 12; and / or, the air outlet cover 16 includes a second ring body 161, a mounting structure 162 and a second rib 163, the second ring body 161 is connected with the air flow shell 14 and is arranged around the mounting structure 162, the mounting structure 162 is connected with the fan assembly 2, the second rib 163 is arranged between the second ring body 161 and the mounting structure 162 and connects the second ring body 161 and the mounting structure 162, and the second ring body 161 and the mounting structure 162 form the air outlet 13.

[0053] In the embodiment, the connection between the first ring body 151 and the air flow shell 14 includes but is not limited to bolt connection, clamping and the like, and the first rib 153 is arranged between the first ring body 151 and the inner ring body 152 by one-piece injection molding. It can be understood that part of the structure of the first rib 153 protrudes from the end face of the first ring body 151, the protruding part can be used as a guide structure of the air flow, helping the air flow to flow more smoothly from the air inlet 12 to the air outlet 13, reducing the deflection and mutation of the air flow in the local area, thereby reducing the generation of vortex and turbulence.

[0054] The connection between the second ring body 161 and the shell 14 includes, but is not limited to, bolt connection, clamping, etc., and the second rib 163 is arranged between the second ring body 161 and the mounting structure 162 by integral injection molding. Correspondingly, the fan assembly 2 is connected with the mounting structure 162 by clamping. It can be understood that the mounting structure 162 is in a cylindrical shape and gradually expands in the direction close to the air outlet 13, and an annular gap is formed between the mounting structure 162 and the inner wall of the air outlet duct for the airflow to pass through. Further, the gap between the mounting structure 162 and the inner wall of the air outlet duct gradually decreases, achieving the effect of converging the airflow, so that the flow rate of the airflow after passing through the mounting structure 162 increases, improving the wind power. Moreover, the inner wall of the mounting structure 162 is arranged in an arc shape, so that the airflow can smoothly pass through the mounting structure 162.

[0055] In combination Figure 4 In an embodiment of the present application, the fan assembly 2 further comprises a fan body 21 and a fan blade 22, and the fan blade 22 comprises an inner hub 221, an outer hub 222, an inner blade 223 and an outer blade 224. The inner hub 221 is connected with the fan body 21, the outer hub 222 is sleeved on the outer periphery of the inner hub 221 and is coaxially arranged with the inner hub 221, and an air inlet channel is formed between the outer hub 222 and the inner hub 221 and communicates with the air outlet duct. The outer blade 224 is connected to the outer periphery of the outer hub 222, and the inner blade 223 is arranged in the air inlet channel and is connected with the outer hub 222 and the inner hub 221, respectively.

[0056] In this embodiment, it can be understood that the fan blade 22 adopts a combination of axial flow type blade and centrifugal type blade. Specifically, the outer blade 224 adopts an axial flow type fan blade 22, which has large air volume and small wind speed; the inner fan blade 22 adopts a centrifugal type fan blade 22, which has small air volume and large wind speed, and the combination of the two increases the air volume and wind speed of the fan body 21. In addition, the inner blade 223 and the outer blade 224 can be arranged in a staggered manner, i.e., there is a phase difference between the inner blade 223 and the outer blade 224, i.e., the airflow does not reach the same position at the same time, so as to reduce the instability of the airflow and make the airflow more continuous and stable, thereby increasing the flow rate. The arrangement of such a fan assembly 2 greatly improves the flow rate and wind power of the airflow in the air outlet duct. It should be noted that the first air duct 1a and the second air duct 1b guide the airflow, reducing the mutual collision of the inlet airflow, effectively reducing the wind power loss and reducing the wind noise. The airflow generated by the centrifugal blade has large air pressure, and the airflow generated by the outer blade 224 and the airflow generated by the inner blade 223 are mixed, which can increase the wind power of the mixed airflow. This is conducive to reducing the wind noise and enhancing the air outlet wind power of the hair dryer.

[0057] In combination Figure 2In an embodiment of the present application, the air blowing device further comprises an outer shell 3, which is sleeved on the outer periphery of the air outlet shell 1, and the outer shell 3 extends along the side opposite to the air outlet shell 1 to form a handle part 31.

[0058] In this embodiment, in order to further provide physical protection for the internal fan assembly 2 and the air outlet air duct 11, the outer shell 3 is arranged to prevent external factors from damaging the internal assembly. The presence of the handle part 31 makes the entire air blowing device more easy to hold and operate, and improves the convenience and comfort of use.

[0059] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A blower device, characterized in that, The blowing device includes: An air outlet housing is provided with an air outlet duct and an air inlet and an air outlet communicating with the air outlet duct. The air outlet duct also includes a first air duct and a second air duct that are connected to each other. The first air duct gradually narrows from one end near the air inlet to one end away from the air inlet and communicates with the air inlet. The second air duct gradually expands from one end near the air inlet to one end away from the air inlet and communicates with the air outlet. A fan assembly is disposed within the air outlet housing to agitate airflow from the air inlet toward the air outlet.

2. The blower device as described in claim 1, characterized in that, The air outlet duct also includes a third air duct, which is connected to the second air duct and to the air outlet. The fan assembly is located in the second air duct and the third air duct.

3. The blower device as described in claim 2, characterized in that, The third air duct gradually expands from one end near the air inlet to the end away from the air inlet; Alternatively, the third air duct may be configured as a straight air duct.

4. The blower device as described in claim 1, characterized in that, The inner wall cross-section of the first air duct is arc-shaped, the inner wall cross-section of the second air duct is arc-shaped, the inner walls of the first air duct and the second air duct are connected, and the inner wall cross-sections of the first air duct and the second air duct form a continuous parabolic shape.

5. The blower device as described in claim 1, characterized in that, The air outlet housing includes: A flow-concentrating shell, within which the first air duct and the second air duct are formed; An air inlet hood is connected to one end of the flow-gathering housing, and the end of the air inlet hood facing away from the flow-gathering housing forms the air inlet. An air outlet hood is connected to the other end of the flow-gathering housing. The air outlet hood is provided with the air outlet. The fan assembly is connected to the air outlet hood and extends into the flow-gathering housing.

6. The blower device as described in claim 5, characterized in that, The inner cavity of the air inlet shroud gradually narrows from the end furthest from the air inlet to the end closest to the air inlet; And / or, the air inlet shroud is provided with an arc surface at the edge of the air inlet.

7. The blower device as described in claim 5, characterized in that, The converging housing includes a first housing and a second housing connected to each other. The first housing is connected to an air inlet hood, and the second housing is connected to an air outlet hood. The first housing has a first air duct inside, and the second housing has a second air duct inside.

8. The blower device as described in claim 5, characterized in that, The air inlet shroud includes a first ring body, an inner ring body, and a first rib. The first ring body is connected to the converging shell and is arranged around the inner ring body. The first rib is arranged between the first ring body and the inner ring body and connects the first ring body and the inner ring body. The air inlet is formed between the first ring body and the inner ring body. And / or, the air outlet shroud includes a second ring body, a mounting structure, and a second rib. The second ring body is connected to the converging shell and is arranged around the mounting structure. The mounting structure is connected to the fan assembly. The second rib is disposed between the second ring body and the mounting structure and connects the second ring body and the mounting structure. The air outlet is formed between the second ring body and the mounting structure.

9. The blower device as described in any one of claims 1 to 4, characterized in that, The fan assembly also includes a fan body and fan blades. The fan blades include an inner hub, an outer hub, inner blades, and outer blades. The inner hub is connected to the fan body. The outer hub is sleeved on the outer periphery of the inner hub and is coaxially arranged with the inner hub. An air inlet channel communicating with the air outlet duct is formed between the outer hub and the inner hub. The outer blade is connected to the outer periphery of the outer hub, and the inner blade is disposed in the air inlet channel and is respectively connected to the outer hub and the inner hub.

10. The blower device as described in any one of claims 1 to 4, characterized in that, The blower also includes an outer casing, which is fitted around the outer periphery of the air outlet housing, and the outer casing extends along the side opposite to the air outlet housing to form a handle.

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