Fan

Abstract

The utility model discloses a fan, and relates to the technical field of fans, the fan provided by the utility model comprises a shell, a fan assembly and an air outlet cover, an air blowing channel is formed in the shell, and the shell is provided with an air outlet end communicated with the air blowing channel; the fan assembly is arranged in the air blowing channel and disturbs airflow to flow towards the air outlet end. The air outlet cover is connected to the shell and covers the air outlet end, the air outlet cover is provided with a first air outlet hole and a second air outlet hole which penetrate through the air outlet cover in the air outlet direction, the first air outlet hole and the second air outlet hole communicate with the air blowing channel, and the first air outlet hole surrounds the second air outlet hole. According to the technical scheme, the second air outlet holes are formed in the flow limiting structure, the first air outlet holes surround the second air outlet holes, a negative pressure area at the center of airflow blown out of the first air outlet holes is eliminated, the situation that the airflow blown out of the first air outlet holes flows back to the negative pressure area is avoided, and the air outlet amount is increased.

Description

TECHNICAL FIELD

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

[0002] In the related art, in order to improve the safety and the appearance of fan, the fan blade of fan adopts hidden design, the air outlet of this fan adopts annular or frame shape etc., the center surrounded by the air outlet is the flow limiting structure of entity, the flow limiting structure cannot blow outwards, so when the fan blows, a negative pressure zone will be generated outside the flow limiting structure, causing the wind blown by the air outlet to backflow to the negative pressure zone, which reduces the air output. SUMMARY

[0003] The utility model discloses a fan, which aims to eliminate the negative pressure zone at the center of the air outlet of the fan and improve the air output of the fan.

[0004] To achieve the above object, the utility model discloses a fan, which comprises a shell, a fan assembly and an air outlet cover, the shell is formed with a blowing channel, and the shell is provided with an air outlet end communicating with the blowing channel; the fan assembly is arranged in the blowing channel and disturbs airflow to flow towards the air outlet end; the air outlet cover is connected to the shell and covers the air outlet end, the air outlet cover is provided with a first air outlet hole and a second air outlet hole penetrating the air outlet cover in the air outlet direction, the first air outlet hole and the second air outlet hole are respectively communicated with the blowing channel, and the first air outlet hole is arranged around the second air outlet hole.

[0005] In an embodiment, the air outlet cover comprises a first air guide ring, a first connecting piece and a flow limiting structure, the first air guide ring is connected to the shell and arranged around the flow limiting structure, the first connecting piece connects the inner wall of the first air guide ring and the outer periphery of the flow limiting structure, the first air guide ring and the flow limiting structure form the first air outlet hole therebetween, and the flow limiting structure is provided with the second air outlet hole.

[0006] In an embodiment, the flow limiting structure comprises a second air guide ring, a second connecting piece and a mounting structure, the first air guide ring is arranged around the second air guide ring, the first connecting piece connects the first air guide ring and the second air guide ring, the second air guide ring is arranged around the mounting structure, the second connecting piece connects the inner wall of the second air guide ring and the outer periphery of the mounting structure, the second air guide ring and the mounting structure form the second air outlet hole therebetween, the fan assembly comprises a fan body and a fan blade, the fan body is connected with the mounting structure in a matching mode, and the fan blade is arranged in the blowing channel and connected with the fan body in a transmission mode.

[0007] In an embodiment, a side of the mounting structure facing away from the blowing channel is provided with a recess, and the fan body is arranged in the recess; the flow-limiting structure further comprises a protective cover connected to the side of the mounting structure facing away from the blowing channel and covering the recess, and the protective cover gradually contracts in the air outlet direction.

[0008] In an embodiment, a distance between the inner wall of the second air guide ring and the outer wall of the mounting structure gradually increases in the air outlet direction.

[0009] In an embodiment, a distance between the inner wall of the first air guide ring and the outer periphery of the flow-limiting structure gradually decreases in the air outlet direction.

[0010] In an embodiment, the fan assembly comprises a fan body and a fan blade, the fan blade comprises 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 coaxially arranged with the inner hub and is sleeved on the outer periphery of the inner hub, an air inlet flow channel is formed between the outer hub and the inner hub, and the second air outlet hole is arranged opposite to the air inlet flow channel; the outer blade is connected to the outer periphery of the outer hub, and the inner blade is arranged in the air inlet flow channel and connected to the outer hub and the inner hub.

[0011] In an embodiment, a distance between an edge of the outer blade facing away from the inner hub and a center axis of the fan blade gradually increases in the air outlet direction; the shell further comprises a flow-converging cover connected to the air outlet cover and sleeved on the fan blade, and an inner wall of the flow-converging cover is arranged close to the edge of the outer blade facing away from the inner hub.

[0012] In an embodiment, the inner hub is gradually expanded in the air outlet direction; and / or, the outer hub is gradually expanded in the air outlet direction.

[0013] In an embodiment, the flow-converging cover is gradually expanded in the air outlet direction, and the shell further comprises an air inlet cover sleeved on one end of the flow-converging cover facing away from the air outlet cover, the air inlet cover is provided with an air inlet hole communicating with the blowing channel, and an outer periphery of the flow-converging cover is provided with a support rib abutting against an inner wall of the air inlet cover.

[0014] The utility model provides a fan, which comprises a shell fan assembly and an air outlet cover, a blowing channel is formed in the shell, the shell is provided with an air outlet end communicating with the blowing channel; the fan assembly is arranged in the blowing channel and disturbs airflow to flow towards the air outlet end; the air outlet cover is connected to the shell and covers the air outlet end, the air outlet cover is provided with a first air outlet hole and a second air outlet hole penetrating the air outlet cover in the air outlet direction, the first air outlet hole and the second air outlet hole are communicated with the blowing channel respectively, and the first air outlet hole is arranged around the second air outlet hole. The utility model discloses a technical scheme that sets the second air outlet hole on the flow limiting structure, and the first air outlet hole is arranged around the second air outlet hole, thereby eliminating the negative pressure area at the center of the airflow blown out from the first air outlet hole and avoiding the backflow of the air blown out from the first air outlet hole to the negative pressure area, so that the air volume is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0016] Figure 1 The structural schematic diagram of an embodiment of the fan provided by the utility model is shown in the figure.

[0017] Figure 2 The structural schematic diagram of the fan is shown in the figure. Figure 1 The structural schematic diagram of the fan is shown in the figure.

[0018] Figure 3 The structural schematic diagram of the fan is shown in the figure. Figure 1 The structural schematic diagram of the fan is shown in the figure.

[0019] Figure 4 The structural schematic diagram of the fan is shown in the figure. Figure 3 The structural schematic diagram of the fan is shown in the figure.

[0020] Figure 5 The structural schematic diagram of the fan is shown in the figure. Figure 1 The structural schematic diagram of the fan is shown in the figure.

[0021] Figure 6 The structural schematic diagram of the fan is shown in the figure. Figure 5 The structural schematic diagram of the fan is shown in the figure.

[0022] Figure 7 The structural schematic diagram of the fan is shown in the figure. Figure 6 The structural schematic diagram of the fan is shown in the figure.

[0023] Figure 8 The structural schematic diagram of the fan is shown in the figure. Figure 2 The structural schematic diagram of the fan is shown in the figure.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 100, fan;

[0026] 1, housing; 1a, blowing passage; 11, flow concentrator; 111, support rib;

[0027] 2, air outlet cover; 2a, first air outlet hole; 2b, second air outlet hole; 21, first air guide ring; 22, first connecting piece; 23, flow limiting structure; 231, air guide ring; 232, second connecting piece; 233, mounting structure; 233a, groove; 234, protective cover;

[0028] 3, fan body;

[0029] 4, fan blade; 4a, air inlet channel; 41, inner hub; 42, outer hub; 43, inner blade; 44, outer blade;

[0030] 5, air inlet cover; 5a, air inlet hole.

[0031] The realization, functional features and advantages of the utility model will be further described in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with 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 belong to the protection scope of the utility model.

[0033] 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 posture, and if the certain posture changes, the directional indications also change accordingly.

[0034] 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 the ordinary skilled 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.

[0035] The utility model provides a fan 100.

[0036] Please refer to Figures 1 to 4 In an embodiment of the utility model, the fan 100 includes a housing 1, a fan assembly and an air outlet cover 2, the housing 1 is formed with a blowing channel 1a, the housing 1 is provided with an air outlet end communicating with the blowing channel 1a, the fan assembly is arranged in the blowing channel 1a and disturbs airflow to flow towards the air outlet end, and the air outlet cover 2 is connected to the housing 1 and covers the air outlet end, the air outlet cover 2 is provided with a first air outlet hole 2a and a second air outlet hole 2b penetrating the air outlet cover 2 in the air outlet direction, the first air outlet hole 2a and the second air outlet hole 2b are respectively communicated with the blowing channel 1a, and the first air outlet hole 2a is arranged around the second air outlet hole 2b.

[0037] In the embodiment, the fan 100 includes a housing 1, a fan assembly and an air outlet cover 2, the housing 1 is formed with a blowing channel 1a, the housing 1 is provided with an air outlet end communicating with the blowing channel 1a, it can be understood that one end of the blowing channel 1a is air inlet, and the other end is air outlet, and the air outlet end is located at one end of the blowing port of the housing 1. The air outlet cover 2 is connected to the housing 1 and covers the air outlet end, the air outlet cover 2 can be detachably connected with the housing 1 through thread or clamping structure and the like, considering the thin design of the fan 100, the air outlet cover 2 and the housing 1 can also be an integral molding structure. The fan assembly is arranged in the blowing channel 1a and disturbs airflow to flow towards the air outlet end, the fan assembly is used for generating airflow and guiding the direction of airflow, so that the airflow passes through the blowing channel 1a along the direction from the air inlet end to the air outlet end of the housing 1.

[0038] The air outlet cover 2 is provided with a first air outlet hole 2a and a second air outlet hole 2b penetrating the air outlet cover 2 along the air outlet direction, the first air outlet hole 2a and the second air outlet hole 2b are respectively communicated with the blowing channel 1a, and the first air outlet hole 2a is arranged around the second air outlet hole 2b. It can be understood that the first air outlet hole 2a is arranged in a ring shape, and the blown air flow diverges to the ring center and the ring periphery based on the ring shape, which can improve the air flow rate and the wind power, and the fan blade 4 of the fan 100 is hidden, thereby improving the safety and the visual effect of the fan 100. However, the ring-shaped air outlet causes a negative pressure area to be gradually formed in the ring center, and part of the air flow will be sucked into the negative pressure area in the center, that is, the air blown out of the ring-shaped first air outlet hole 2a will flow back to the negative pressure area, thereby reducing the air outlet amount. Therefore, the second air outlet hole 2b is arranged at the center of the ring-shaped first air outlet hole 2a, so that the blowing channel 1a can blow air to the negative pressure area to eliminate the negative pressure area and increase the air outlet amount. It should be noted that the first air outlet hole 2a can be arranged as a ring-shaped through hole, or as a plurality of ring-shaped through holes. Similarly, a plurality of second air outlet holes 2b can also be arranged, or the plurality of second air outlet holes 2b can be arranged in a ring shape.

[0039] The technical scheme of the embodiment eliminates the negative pressure area at the center of the air flow blown out of the first air outlet hole 2a, avoids the backflow of the air blown out of the first air outlet hole 2a to the negative pressure area, and improves the air outlet amount.

[0040] Further, please refer to Figures 3 to 6 In an embodiment of the utility model, the air outlet cover 2 includes a first air guide ring 23121, a first connecting piece 22 and a flow limiting structure 23, the first air guide ring 23121 is connected to the shell 1 and is arranged around the flow limiting structure 23, the first connecting piece 22 connects the inner wall of the first air guide ring 23121 and the outer periphery of the flow limiting structure 23, the first air outlet hole 2a is formed between the first air guide ring 23121 and the flow limiting structure 23, and the flow limiting structure 23 is provided with the second air outlet hole 2b.

[0041] In the embodiment, the first air guide ring 23121 is detachably connected with the shell 1 through threads or clamping structure, or the first air guide ring 23121 is integrally formed with the shell 1. The first air guide ring 23121 surrounds the outer periphery of the flow limiting structure 23, and the annular air outlet hole is formed between the first air guide ring 23121 and the flow limiting structure 23. The first connecting piece 22 is arranged between the first air guide ring 23121 and the flow limiting structure 23 and connects the two into one whole, and the first connecting piece 22 is a plate-shaped rib and is arranged to extend in the air outlet direction, thereby reducing the obstruction of the first connecting piece 22 to the air blowing. The annular first air outlet hole 2a allows the fan 100 to have a larger air outlet area. A plurality of first connecting pieces 22 can be arranged to divide the annular air outlet hole into a plurality of arc-shaped holes, thereby improving the connecting strength between the first air guide ring 23121 and the flow limiting structure 23. In this way, the fan assembly can be fixed on the flow limiting structure 23, thereby simplifying the mounting and fixing structure of the fan assembly. The fan 100 is designed to be light and thin. The flow limiting structure 23 is located at the center of the annular first air outlet hole 2a, and the side of the flow limiting structure 23 facing away from the air blowing channel 1a is prone to form a negative pressure area. The second air outlet hole 2b is arranged on the flow limiting structure 23, so that the negative pressure area also has air flow flowing in, thereby eliminating the negative pressure area.

[0042] Further, please refer to Figures 3 to 6 In an embodiment of the utility model, the flow limiting structure 23 includes a second air guide ring 231, a second connecting piece 232 and a mounting structure 233. The first air guide ring 23121 surrounds the second air guide ring 231, the first connecting piece 22 connects the first air guide ring 23121 and the second air guide ring 231, the second air guide ring 231 surrounds the mounting structure 233, the second connecting piece 232 connects the inner wall of the second air guide ring 231 and the outer periphery of the mounting structure 233, and the second air guide ring 231 and the mounting structure 233 form the second air outlet hole 2b. The fan assembly includes a fan body 3 and a fan blade 4. The fan body 3 is connected with the mounting structure 233, and the fan blade 4 is arranged in the air blowing channel 1a and is in transmission connection with the fan body 3.

[0043] In the embodiment, the flow limiting structure 23 comprises a second air guide ring 231, a second connecting member 232 and a mounting structure 233. The outer periphery of the second air guide ring 231 is connected with the first connecting member 22 to achieve connection and fixation with the first air guide ring 23121. The second air guide ring 231 is spaced apart from the mounting structure 233 to form an annular air outlet hole. The outer periphery wall of the mounting structure 233 is connected with the inner periphery wall of the second air guide ring 231 to form an integral whole. A plurality of second connecting members 232 can be arranged to divide the second air outlet hole 2b into a plurality of arc-shaped holes. The second connecting member 232 is a plate-shaped rib and is arranged in the air outlet direction. In this way, the second connecting member 232 reduces the obstruction to air blowing. The annular second air outlet hole 2b can match the airflow blown out of the first air outlet hole 2a to the negative pressure area. Finally, the two airflows are relatively uniform when they converge, avoiding the deviation of the air blowing direction caused by uneven convergence. A plurality of second connecting members 232 can be arranged to divide the annular air outlet hole into a plurality of arc-shaped holes, thereby improving the connection strength between the second air guide ring 231 and the mounting structure 233. In this way, the fan assembly can be fixed on the mounting structure 233, thereby simplifying the mounting and fixing structure of the fan assembly. The thin and light design of the fan 100 is facilitated. The mounting structure 233 is provided with screw holes and clamping grooves for connecting and fixing the fan body 3. In this way, additional structures for realizing fan mounting need not be arranged in the air blowing channel 1a, thereby simplifying the mounting of the fan assembly, facilitating the thin and light design of the fan 100, and simplifying the disassembly and assembly steps of the fan 100, thereby facilitating the maintenance and other operations of the fan assembly.

[0044] Further, please refer to Figures 3 to 6 In an embodiment of the utility model, the side of the mounting structure 233 away from the air blowing channel 1a is provided with a recess 233a, and the fan body 3 is arranged in the recess 233a. The flow limiting structure 23 further comprises a protective cover 234 connected to the side of the mounting structure 233 away from the air blowing channel 1a and covering the recess 233a. The protective cover 234 gradually shrinks in the air outlet direction.

[0045] In the embodiment, the side of the mounting structure 233 away from the blowing channel 1a is provided with a groove 233a, the bottom wall of the groove 233a is provided with a shaft hole and a mounting hole, the fan body 3 is arranged on the side of the mounting structure 233 away from the blowing channel 1a and is mounted in the groove 233a, the transmission shaft of the fan body 3 penetrates through the shaft hole and protrudes from the side of the mounting structure 233 facing the blowing channel 1a, and the fan blade 4 is arranged on the side of the mounting structure 233 facing the blowing channel 1a and is connected with the transmission shaft, so that the fan is arranged in the blowing channel 1a following the mounting structure 233, the thickness of the fan 100 is reduced, the thin and light design of the fan 100 is facilitated, the fan body 3 is located downstream of the fan blade 4, the airflow blows through the fan body 3 after being accelerated by the fan blade 4, the heat dissipation effect of the fan body 3 can be improved, the overheating of the fan body 3 during operation is prevented, the fan can continue to operate for a longer time, and the sustainable working time of the fan 100 is improved. The protective cover 234 covers the groove 233a, the fan body 3 is hidden and protected, the protective cover 234 gradually shrinks along the air outlet direction, the outer wall of the protective cover 234 can be arc-shaped, the airflow blown out of the second blowing hole is guided to the center, and the negative pressure area in the center area is eliminated.

[0046] Further, please refer to Figures 3 to 6 In an embodiment of the utility model, the spacing between the inner wall of the second air guide ring 231 and the outer wall of the mounting structure 233 gradually increases along the air outlet direction.

[0047] In the embodiment, the spacing between the inner wall of the second air guide ring 231 and the outer wall of the mounting structure 233 gradually increases along the air outlet direction, that is, the second air outlet hole 2b gradually expands along the air outlet direction, the purpose of this arrangement is that the expanded second air outlet hole 2b makes the airflow flow out of the second air outlet hole 2b in the form of outward diffusion, further reduces the formation of negative pressure space, and outward diffusion can supplement the air outlet of the first air outlet hole 2a, further increasing the air outlet of the fan 100.

[0048] Further, please refer to Figures 3 to 6 In an embodiment of the utility model, the spacing between the inner wall of the first air guide ring 23121 and the outer periphery of the flow limiting structure 23 gradually decreases along the air outlet direction.

[0049] In the embodiment, the spacing between the inner wall of the first air guide ring 23121 and the outer periphery of the flow limiting structure 23 gradually decreases along the air outlet direction, that is, the first air outlet hole 2a gradually shrinks along the air outlet direction, the purpose of this arrangement is to improve the flow rate and wind power of the airflow blown out of the first air outlet hole 2a, thereby improving the distance that the airflow can be blown out, and improving the use distance of the fan 100.

[0050] Further, please refer toFigure 3 and Figure 7 In an embodiment of the present application, the fan assembly comprises a fan body 3 and a fan blade 4, the fan blade 4 comprises an inner hub 41, an outer hub 42, an inner blade 43 and an outer blade 44; the inner hub 41 is connected to the fan body 3, the outer hub 42 is coaxially arranged with the inner hub 41 and is sleeved on the outer periphery of the inner hub 41, an air inlet flow channel 4a is formed between the outer hub 42 and the inner hub 41, and the second air outlet hole 2b is oppositely arranged with the air inlet flow channel 4a; the outer blade 44 is connected to the outer periphery of the outer hub 42, and the inner blade 43 is arranged in the air inlet flow channel 4a and connected to the outer hub 42 and the inner hub 41.

[0051] In the embodiment, the outer blade 44 is responsible for inhaling and discharging air, while the inner blade 43 can enhance the guidance and acceleration of airflow, reduce vortex and backflow, thereby improving the overall air flow of the fan 100. The outer hub 42 and the inner hub 41 form an air inlet flow channel 4a, that is, the inner blade 43 is arranged in the air inlet flow channel 4a, and the second air outlet hole 2b is oppositely arranged with the air inlet flow channel 4a, that is, the inner blade 43 is arranged corresponding to the second air outlet hole 2b, so that the inner blade 43 can enhance the air volume and flow rate of the second air outlet hole 2b, and ensure that the airflow can better rush out of the second air outlet hole 2b to eliminate the negative pressure area.

[0052] In addition, the inner blade 43 and the outer blade 44 can be arranged in a staggered manner, that is, there is a phase difference between the inner blade 43 and the outer blade 44, which means that they do not reach the same position at the same time. This design can reduce the instability of airflow, making the airflow more continuous and stable, thereby increasing the flow rate. The arrangement of such a fan assembly greatly improves the flow rate and wind power of the airflow in the air outlet channel. Based on this, the resistance caused by the setting of the flow limiting structure 23 and the gradual contraction of the first air outlet hole 2a in the air outlet direction can be better overcome. The fan assembly of the present application can provide airflow with high flow rate and strong wind power, which can offset the wind resistance caused by the gradual contraction of the first air outlet hole 2a in the air outlet direction and the flow limiting structure 23.

[0053] Further, referring to Figure 2 , Figure 3 and Figure 7 In an embodiment of the present application, the distance between the edge of the outer blade 44 away from the inner hub 41 and the rotating center axis of the fan blade 4 is gradually increased along the air outlet direction; the shell 1 further has a flow concentrator 11 connected to the air outlet cover 2 and sleeved with the fan blade 4, and the inner wall of the flow concentrator 11 is arranged adjacent to the edge of the outer blade 44 away from the inner hub 41.

[0054] In the embodiment, the distance between the edge of the outer blade 44 away from the inner hub 41 and the rotation center axis of the fan blade 4 gradually increases in the air outlet direction, and the gradually increasing distance can make the airflow more uniform when leaving the fan blade 4, avoiding local high-speed airflow, so that the airflow distribution of the entire air outlet area is more uniform, and more importantly, such a setting can adapt to the shape of the concentrator cover 11. The concentrator cover 11 is located in the air blowing channel 1a in the shell 1, and one end of the concentrator cover 11 abuts against the air outlet cover 2, so that the inner surface of the concentrator cover 11 and the inner surface of the first air outlet hole 2a are smoothly transitioned, achieving the effect of reducing wind resistance and turbulence. The concentrator cover 11 is sleeved on the outer periphery of the fan blade 4, and the inner wall of the concentrator cover 11 is arranged close to the edge of the outer blade 44 away from the inner hub 41, that is, the concentrator cover 11 and the fan blade 4 are both gradually expanded in the air outlet direction, so that the airflow passing through the fan blade 4 and the concentrator cover 11 can better diffuse to the four sides of the air blowing channel 1a, and correspond to the annularly arranged first air outlet hole 2a, which is beneficial to optimize the path of the airflow in the air blowing channel 1a, eliminate vortex and turbulence, improve the air volume of the fan 100, and reduce the noise caused by vortex and turbulence.

[0055] Further, referring to Figure 4 In an embodiment of the utility model, inner hub 41 gradually expands in air outlet direction, and / or, outer hub 42 gradually expands in air outlet direction.

[0056] In the embodiment, in order to better guide the airflow to diffuse to the four sides of the air blowing channel 1a, the outer hub 42 gradually expands in the air outlet direction, that is, the outer peripheral wall of the outer hub 42 is inclinedly arranged to the inner wall of the air blowing channel 1a, and the airflow flows along the outer wall of the outer hub 42 to the first air outlet hole 2a; similarly, the inner hub 41 gradually expands in the air outlet direction, that is, the outer peripheral wall of the inner hub 41 is inclinedly arranged to the inner wall of the air blowing channel 1a, and the airflow flows along the outer peripheral wall of the inner hub 41 to the second air outlet hole 2b, thus guiding the airflow in the air blowing channel 1a, shortening and optimizing the path of the airflow in the air blowing channel 1a, avoiding unnecessary path to cause vortex and turbulence, reducing the loss of wind speed and wind force, thereby improving the air volume of the fan 100, and reducing the noise generated by vortex and turbulence.

[0057] Further, referring to Figure 2 And Figure 3 In an embodiment of the utility model, the concentrator cover 11 gradually expands in the air outlet direction, the shell 1 further includes an air inlet cover 5, the air inlet cover 5 is sleeved on one end of the concentrator cover 11 away from the air outlet cover 2, the air inlet cover 5 is provided with an air inlet hole communicating with the air blowing channel 1a, the outer periphery of the concentrator cover 11 is provided with a support rib 111, and the support rib 111 abuts against the inner wall of the air inlet cover 5.

[0058] In the embodiment, the flow concentrator 11 is arranged in a diverging manner along the air outlet direction, the air flow is diffused along the inner surface of the flow concentrator 11 to the periphery of the air blowing channel 1a, and due to the fact that the flow concentrator 11 occupies the space for forming the vortex, the air flow can only flow along the inner surface of the flow concentrator 11 to the air outlet end, and cannot flow back, thus eliminating the vortex in the air blowing channel 1a, improving the air outlet volume of the fan 100, and reducing the noise caused by the vortex. The shell 1 further comprises an air inlet cover 5, which is sleeved on the end of the flow concentrator 11 opposite to the air outlet cover 2, and the air inlet cover 5 is provided with an air inlet hole communicating with the air blowing channel 1a. The air inlet cover 5 is used to prevent sundries from being sucked into the fan assembly, or to prevent the fan blades 4 from hurting people. The outer periphery of the flow concentrator 11 is provided with support ribs 111 abutting against the inner wall of the air inlet cover 5. The air inlet cover 5 is connected to the end of the shell 1 opposite to the air outlet cover 2, and the flow concentrator 11 is arranged in the air blowing channel 1a in the shell 1. Therefore, there can be a large gap between the flow concentrator 11 and the air inlet cover 5, which weakens the structural strength. Therefore, a plurality of support ribs 111 are arranged on the outer periphery of the flow concentrator 11 in a spaced manner, the support ribs 111 abut against the inner wall of the air inlet cover 5, thereby strengthening the connection between the air inlet cover 5 and the flow concentrator 11, and providing support force for the air inlet cover 5, so as to prevent the air inlet cover 5 from being easily damaged due to external forces such as extrusion or impact.

[0059] The above description is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation or direct / indirect application in other related technical fields based on the technical concept of the present application and the content of the present application are included in the patent protection scope of the present application.

Claims

1. A fan, characterized by, The fan comprises: a housing, a blowing channel being formed in the housing, the housing being provided with an air outlet end communicating with the blowing channel; a fan assembly arranged in the blowing channel and disturbing airflow to flow towards the air outlet end; and an air outlet cover connected to the housing and covering the air outlet end, the air outlet cover being provided with a first air outlet hole and a second air outlet hole penetrating the air outlet cover in the air outlet direction, the first air outlet hole and the second air outlet hole being respectively communicated with the blowing channel, and the first air outlet hole being arranged around the second air outlet hole.

2. The fan of claim 1, wherein, The air outlet cover comprises a first air guide ring, a first connecting piece and a flow limiting structure, the first air guide ring being connected to the housing and arranged around the flow limiting structure, the first connecting piece connecting an inner wall of the first air guide ring and an outer periphery of the flow limiting structure, the first air guide ring and the flow limiting structure forming the first air outlet hole therebetween, and the flow limiting structure being provided with the second air outlet hole.

3. The fan of claim 2, wherein, The flow limiting structure comprises a second air guide ring, a second connecting piece and a mounting structure; the first air guide ring is arranged around the second air guide ring, the first connecting piece connects the first air guide ring and the second air guide ring, the second air guide ring is arranged around the mounting structure, and the second connecting piece connects an inner wall of the second air guide ring and an outer periphery of the mounting structure, the second air guide ring and the mounting structure forming the second air outlet hole therebetween; the fan assembly comprises a fan body and a fan blade, the fan body is connected with the mounting structure, and the fan blade is arranged in the blowing channel and is in transmission connection with the fan body.

4. The fan of claim 3, wherein, a side of the mounting structure facing away from the blowing channel is provided with a groove, and the fan body is arranged in the groove; the flow limiting structure further comprises a protective cover, the protective cover is connected to the side of the mounting structure facing away from the blowing channel and covers the groove, and the protective cover gradually contracts in the air outlet direction.

5. The fan of claim 3, wherein a distance between the inner wall of the second air guide ring and the outer wall of the mounting structure gradually increases in the air outlet direction.

6. The fan of claim 2 wherein, a distance between the inner wall of the first air guide ring and the outer periphery of the flow limiting structure gradually decreases in the air outlet direction.

7. The fan of claim 1 wherein, the fan assembly comprises a fan body and a fan blade, the fan blade comprises 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 coaxially arranged with the inner hub and is sleeved on an outer periphery of the inner hub, an air inlet flow channel is formed between the outer hub and the inner hub, and the second air outlet hole is oppositely arranged with the air inlet flow channel; the outer blade is connected to an outer periphery of the outer hub, and the inner blade is arranged in the air inlet flow channel and is connected with the outer hub and the inner hub.

8. The fan of claim 7, wherein, an edge of the outer blade away from the inner hub and a center axis of the fan blade gradually increase in the air outlet direction; the housing further has a flow converging cover, the flow converging cover is connected to the air outlet cover and is sleeved with the fan blade, and an inner wall of the flow converging cover is arranged close to the edge of the outer blade away from the inner hub.

9. The fan of claim 7, wherein, the inner hub gradually expands in the air outlet direction; and / or, the outer hub gradually expands in the air outlet direction.

10. The fan of claim 8, wherein, The poly-flow cover is arranged in a gradually expanding manner along the air outlet direction, the shell further comprises an air inlet cover, the air inlet cover is sleeved at one end of the poly-flow cover which is opposite to the air outlet cover, the air inlet cover is provided with an air inlet hole which is communicated with the air blowing channel, and the outer periphery of the poly-flow cover is provided with a supporting rib which abuts against the inner wall of the air inlet cover.

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