Head unit, air duct system, fan

Abstract

The present invention provides a head assembly, an air duct system, and a fan. A head assembly includes an air outlet duct and an air guide plate. A plurality of air guide plates separate the air outlet duct into a plurality of air outlet portions. The air outlet portions include a first wind wall and a second wind wall arranged opposite to each other, wherein: the first wind wall includes a first curved guide surface and a first outlet surface connected to the first curved guide surface along the airflow direction; the second wind wall includes a second curved guide surface and a second outlet surface connected to the second curved guide surface along the airflow direction; an air outlet gap is formed between the first outlet surface and the second outlet surface, and along the airflow direction, an extended surface of the first curved guide surface intersects with the second outlet surface, and an extended surface of the second curved guide surface intersects with the first outlet surface. The head assembly in the present invention has a large air outlet volume and a strong wind pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a head assembly, an air duct system and a fan. Background Art

[0002] In the bladeless fan in the prior art, external airflow is sucked into the fan, and the power system converts the external airflow into a high-speed rotating airflow. The high-speed rotating airflow enters the air outlet assembly in the head through the diffusion assembly, and flows out to the outside through the air outlet on the air outlet assembly.

[0003] However, the air outlet component generally has two left and right air outlet ducts, each of which is surrounded by two oppositely arranged wind wall structures, and the air outlet is the gap reserved at the joint of the two wind walls. A part of the airflow entering the air outlet duct flows along the inner surface of the wind wall. At the air outlet, the airflow on the wind walls on both sides needs to converge to the air outlet. Due to the large length of the air outlet duct, in order to reduce the loss of the airflow along the way in the air outlet duct, the above-mentioned wind wall structure is generally designed as an arc structure with an arc-shaped guide surface. When the two arc-shaped wind walls are arranged opposite to each other, the air outlet is located in the middle of the two closed surfaces as mentioned above, resulting in convection phenomenon when the airflow converges toward the air outlet. While convection reduces the air output of the bladeless fan outlet, it is also easy to cause noise and reduced wind sensation for users. Summary of the invention

[0004] Therefore, the present invention aims to solve the above-mentioned problems, thereby providing a head assembly, an air duct system, and a fan.

[0005] In order to solve the above problems, the present invention provides a head assembly, including an air outlet duct and an air guide plate, a plurality of the air guide plates divide the air outlet duct into a plurality of air outlet portions, the air outlet portions have a first wind wall and a second wind wall arranged opposite to each other, wherein: the first wind wall includes a first curved guide surface and a first outlet surface connected to the first curved guide surface along the airflow direction; the second wind wall includes a second curved guide surface and a second outlet surface connected to the second curved guide surface along the airflow direction; an air outlet gap is formed between the first outlet surface and the second outlet surface, and along the airflow direction, an extension surface of the first curved guide surface intersects with the second outlet surface, and an extension surface of the second curved guide surface intersects with the first outlet surface.

[0006] Furthermore, the first arc-shaped flow-guiding surface and the second arc-shaped flow-guiding surface are both constructed as circular arc surfaces.

[0007] Furthermore, the first arc-shaped guide surface and the second arc-shaped guide surface are configured to have different arc radii.

[0008] Furthermore, the first arc-shaped guide surface and the second arc-shaped guide surface are constructed so that the radius of one of them is at least 4 times that of the other.

[0009] Further, the first outflow surface and the second outflow surface are both configured as flat surfaces.

[0010] Furthermore, the air outlet gap is configured to be 3 mm.

[0011] Furthermore, a first transition flow surface is provided between the first arc-shaped guide surface and the first outflow surface, and a second transition flow surface is provided between the second arc-shaped guide surface and the second outflow surface.

[0012] Furthermore, the air outlet duct comprises a direct current duct arranged along the height direction of the head assembly and a first redirecting flow channel connected to the upper end of the direct current duct along the air flow direction.

[0013] Further, there is an outlet angle A between the outlet direction of the first direction-changing flow channel and the horizontal outlet direction, and the outlet angle A is [20°, 40°].

[0014] Furthermore, the wind outlet angle A is 30°.

[0015] The present invention also provides an air duct system, comprising any of the above-mentioned head components; an air inlet component, arranged below the power device, through which the external air flows into the power device; and a flow guide component, a cover of which is arranged on the power device, and an air outlet end of which is connected to the air outlet duct.

[0016] Furthermore, the air inlet assembly includes: an air inlet wall, which is annular and has a plurality of air inlet structures arranged thereon; a guide plate, which is arranged in the middle of the air inlet wall, and the external airflow is directed to the power device after being changed direction by the guide plate; and a collecting cover, which is arranged above the guide plate and has an air outlet end connected to the power device.

[0017] Furthermore, the collecting cover is constructed in a trumpet shape.

[0018] Furthermore, the guide component includes: a second changing flow channel, in which a plurality of changing blades are arranged, and the changing blades guide the rotating airflow coming out of the power device into a straight airflow; a diffusion flow channel, whose air inlet end is connected to the second changing flow channel and whose air outlet end is connected to the air outlet duct.

[0019] Furthermore, a first diffusion surface and a second diffusion surface arranged opposite to each other are provided at a connection between the diffusion flow channel and the air outlet duct, and the first diffusion surface and the second diffusion surface are connected to a first wind wall and a second wind wall respectively.

[0020] Furthermore, the first diffusion surface and the second diffusion surface are configured as arc surfaces arranged parallel to each other.

[0021] The present invention also provides a fan comprising: any one of the head components described above; or any one of the air duct systems described above.

[0022] Furthermore, the fan is a bladeless fan.

[0023] The technical solution of the present invention has the following advantages:

[0024] 1. The head assembly in the present invention includes an air outlet duct and an air guide plate, and a plurality of air guide plates divide the air outlet duct into a plurality of air outlet portions, and the air outlet portions have a first wind wall and a second wind wall arranged opposite to each other, wherein: the first wind wall includes a first curved guide surface and a first outlet surface connected to the first curved guide surface along the airflow direction; the second wind wall includes a second curved guide surface and a second outlet surface connected to the second curved guide surface along the airflow direction; an air outlet gap is formed between the first outlet surface and the second outlet surface, and along the airflow direction, an extension surface of the first curved guide surface intersects with the second outlet surface, and an extension surface of the second curved guide surface intersects with the first outlet surface.

[0025] The air outlet portion in the present invention can effectively ensure that the airflow, when passing through the first wind wall and the second wind wall, prevents convection from occurring when the airflow converges at the air outlet gap, thereby reducing the noise problem caused by the turbulent airflow. At the same time, it can enhance the flow collection effect of the airflow on the first wind wall and the second wind wall when converging at the air outlet gap, and reduce the diversion phenomenon, so as to ensure that the airflow has sufficient injection pressure and speed when coming out of the air outlet gap. The greater the speed and wind pressure of the airflow coming out of the air outlet gap, the more obvious the suction effect on the surrounding gas, and the stronger the suction effect, which can bring about an increase in the overall air output of the bladeless fan, thereby enhancing the user's wind feeling experience.

[0026] 2. The first arc guide surface and the second arc guide surface in the head assembly of the present invention are both constructed as circular arc surfaces. The circular arc surfaces have good guiding effect and can reduce the pressure loss along the flow surface when the gas moves on the flow surface. Compared with other types of curved surface structures, the processing technology of the circular arc surfaces is mature and the processing cost is low.

[0027] 3. The first arc-shaped guide surface and the second arc-shaped guide surface in the head assembly of the present invention are constructed with different arc radii. In the above, an air outlet gap is formed between the first outflow surface and the second outflow surface, and along the airflow direction, the extension surface of the first arc-shaped guide surface intersects with the second outflow surface, and the extension surface of the second arc-shaped guide surface intersects with the first outflow surface. In the present invention, the above constraints are met by adopting different arc radii, which is easy to design and operate.

[0028] 4. The first curved guide surface and the second curved guide surface in the head assembly of the present invention are constructed so that the radius of one of them is at least 4 times that of the other, so as to ensure that the intersection of the extended surface of the first curved guide surface and the second outflow surface or the intersection of the extended surface of the second curved guide surface and the first outflow surface is located as close as possible to the air outlet end of the air outlet gap, that is, the intersection point of the airflow of the first wind wall and the second wind wall is close to the air outlet end of the air outlet gap, preventing the above-mentioned intersection point from intersecting on the first curved guide surface or the second curved guide surface, causing the airflow to flow back along the curved surface, thus forming a convection problem again.

[0029] 5. The first outflow surface and the second outflow surface in the head assembly of the present invention are both constructed as flat surfaces. The planes are easy to process, and the air outlet gap formed between the two planes has a strong ability to force the airflow to change direction, which can improve the direct current injection ability of the airflow at the air outlet gap and prevent the airflow from diverging to the surroundings and affecting the outflow speed.

[0030] 6. In the nose assembly of the present invention, a first transition flow surface is arranged between the first curved guide surface and the first outlet flow surface, and a second transition flow surface is arranged between the second curved guide surface and the second outlet flow surface. This enables the airflow to smoothly transition to the first outlet flow surface and the second outlet flow surface when flowing along the first curved guide surface and the second curved guide surface, thereby reducing the wind resistance caused by the break at the flow surface.

[0031] 7. There is an outlet angle A between the outlet direction of the first direction-changing flow channel in the head assembly of the present invention and the horizontal outlet direction, and the outlet angle A is [20°, 40°]. The setting of the above outlet angle expands the maximum outlet angle of the upper air outlet of the bladeless fan. Compared with the design in the prior art that the outlet direction is perpendicular to the user, the upper air outlet of the bladeless fan in the present invention is set at an upward inclination angle. When facing users of different heights, it can satisfy the user's head as much as possible and obtain an effective blowing effect, thereby improving the user's product experience.

[0032] 8. The air inlet assembly in the air duct system of the present invention includes: an air inlet wall, which is annular and has a plurality of air inlet structures arranged thereon; a guide plate, which is arranged in the middle of the air inlet wall, and the external airflow is directed to the power device after being changed direction by the guide plate; and a collecting cover, which is arranged above the guide plate, and its air outlet end is connected to the power device and the collecting cover is constructed in a trumpet shape. The structural shape of the collecting cover can enhance the collection capacity of the external airflow and increase the air volume. At the same time, the position of the contraction port on the collecting cover can increase the speed of the airflow, which can effectively gain the final wind speed.

[0033] 9. In the air duct system of the present invention, a first diffusion surface and a second diffusion surface arranged opposite to each other are provided at the connection between the diffusion flow channel and the outlet air duct, and the first diffusion surface and the second diffusion surface are respectively connected to the first wind wall and the second wind wall, and the first diffusion surface and the second diffusion surface are constructed as arc surfaces arranged parallel to each other. The structural features of the first diffusion surface and the second diffusion surface ensure that the gas flows smoothly when passing through the diffusion component, and the parallel arrangement ensures that the turning angle of the gas is small when it flows, which can effectively reduce the pressure loss caused by turning and wall resistance, thereby ensuring the final air outlet volume and wind pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A transverse cross-sectional view of the head assembly in Example 1 provided by the present invention;

[0036] Figure 2 for Figure 1 A partial enlarged view of

[0037] Figure 3 A schematic diagram of the airflow principle in Example 1 provided by the present invention;

[0038] Figure 4 A longitudinal sectional view of the head assembly in Embodiment 1 provided by the present invention;

[0039] Figure 5 A schematic diagram of the wind outlet angle in Embodiment 1 provided by the present invention;

[0040] Figure 6 A cross-sectional view of the air duct system in Example 2 provided by the present invention;

[0041] Figure 7 A cross-sectional view of the air inlet assembly in Embodiment 2 provided by the present invention;

[0042] Figure 8 A cross-sectional view of the bladeless fan in Example 3 provided by the present invention.

[0043] Description of reference numerals:

[0044] 1- outlet air duct; 11- direct air duct; 12- first direction-changing air duct;

[0045] 2-first wind wall; 21-first arc-shaped flow guide surface; 22-first outflow surface; 23-first transition flow surface;

[0046] 3-second wind wall; 31-second arc-shaped flow guide surface; 32-second outflow surface; 33-second transition flow surface;

[0047] 4-air inlet assembly; 41-air inlet wall; 42-guide plate; 43-collecting cover;

[0048] 5- Power plant;

[0049] 6-flow guide assembly; 61-second direction-changing flow channel; 62-diffusion flow channel; 621-first diffusion surface; 622-second diffusion surface;

[0050] A – wind angle;

[0051] a-airflow convergence point; b-critical intersection point of the first arc-shaped guide surface; c-extension surface of the first arc-shaped guide surface;

[0052] 7 – Housing. DETAILED DESCRIPTION

[0053] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0057] Example 1

[0058] Figures 1 to 5 As shown, a head assembly provided in the present embodiment includes an air outlet duct 1 and an air guide plate, wherein a plurality of air guide plates separate the air outlet duct into a plurality of air outlet portions, and the air outlet portions include a first wind wall 2 and a second wind wall 3 arranged opposite to each other, wherein: the first wind wall 2 includes a first curved guide surface 21 and a first outlet surface 22 connected to the first curved guide surface 21 along the airflow direction; the second wind wall 3 includes a second curved guide surface 31 and a second outlet surface 32 connected to the second curved guide surface 31 along the airflow direction; an air outlet gap is formed between the first outlet surface 22 and the second outlet surface 32, and along the airflow direction, an extension surface of the first curved guide surface 21 intersects with the second outlet surface 32, and an extension surface of the second curved guide surface 31 intersects with the first outlet surface 22.

[0059] The head assembly in this embodiment is used on a commonly used bladeless fan. The bladeless fan generally has a circular air outlet frame, inside which an air outlet duct 1 is arranged. The fan of the bladeless fan is arranged at the lower part of the machine, and the air outlet duct 1 is arranged at the upper part of the machine. When the airflow moves from bottom to top, the direction of movement needs to be changed so that it can be sprayed toward the user from the air outlet gap, so an air guide plate structure is designed (not shown in the figure).

[0060] The above-mentioned air guide plate structure divides the entire air outlet duct 1 into a plurality of air outlet portions. In this embodiment, the specific composition structure of one air outlet portion is selected for specific description, such as Figure 1 and Figure 2 The structure in shows that Figure 3 This is an explanation of the air flow principle of this structural form of the present embodiment.

[0061] The first wind wall 2 and the second wind wall 3 of the existing bladeless fan are generally two symmetrically arranged structures, especially at the first curved guide surface 21 and the second curved guide surface 31. As a result of such an arrangement, the intersection of the airflow at the first wind wall 2 and the second wind wall 3 is formed. Figure 3 As shown in point a, the two airflows will meet in the form of equal-angle collision. Under the reaction force of the collision, the airflow will disperse to both sides, and the effect of gathering wind and flow will be weakened.

[0062] The structural arrangement of the first arcuate guide surface 21 and the second arcuate guide surface 31 in this embodiment causes the intersection point of the airflow to fall directly on the flow wall of the first outflow surface 22 or the second outflow surface 32. Figure 3 The point b shown in the figure is a critical intersection point, and the points formed by moving the point b toward the outlet of the air outlet gap are all protected objects of the embodiment. Figure 3Taking the first wind wall 2 as an example, the extension surface of the first arc-shaped guide surface 21 and the second outflow surface 32 meet at point b. Firstly, affected by the structural shape of the arc-shaped guide surface, in the initial stage of airflow, Figure 3 As shown in the figure, the flow surface slope of the first curved guide surface 21 is larger, and the flow velocity of the fluid will be faster, resulting in the initial part of the airflow reaching the second outlet surface 32 first. The airflow that arrives first has a fast flow velocity, and a negative pressure area is formed at the intersection of the outlet surfaces. The airflow along the wall of the second curved guide surface 31 that arrives later will converge toward the intersection under the influence of pressure, thereby achieving an effective flow collection effect on the airflow, and the intersection is located at the outlet surface. Under the influence of the wall shape, it can be forced to change the flow toward the outlet of the air outlet gap, thereby preventing the problem of partial airflow backflow and vortex generation during symmetrical intersection in the prior art.

[0063] Therefore, for the above analysis, the air outlet part in this embodiment can effectively ensure that when the airflow leads to the air outlet gap, it can prevent the convection phenomenon when the airflow flowing through the first wind wall 2 and the second wind wall 3 converges at the air outlet gap position, thereby reducing the noise problem caused by the turbulent airflow. At the same time, it can enhance the flow collection effect when the airflow on the first wind wall 2 and the second wind wall 3 converges at the air outlet gap position, and reduce the diversion phenomenon, so as to ensure that the airflow has sufficient injection pressure and speed when it comes out of the air outlet gap position. The greater the speed and wind pressure of the airflow coming out of the air outlet gap, the more obvious the suction effect on the surrounding gas, and the stronger the suction effect, which can bring about an increase in the overall air output of the bladeless fan, thereby enhancing the user's wind feeling experience.

[0064] In this embodiment, the first arc guide surface 21 and the second arc guide surface 31 are both constructed as arc surfaces. The arc surfaces have good guiding effect and can reduce the pressure loss along the flow surface when the gas moves on the flow surface. Compared with other types of curved surface structures, the arc surfaces have mature processing technology and low processing cost.

[0065] In some other embodiments, the first arc-shaped guide surface 21 and the second arc-shaped guide surface 31 may also be other quadratic surface structures, such as a sinusoidal surface, a parabolic surface, a spherical surface, and the like.

[0066] In some other embodiments, the first arc-shaped guide surface 21 and the second arc-shaped guide surface 31 may also be two different types of curved surface structures.

[0067] In the above-mentioned, an air outlet gap is formed between the first outlet surface 22 and the second outlet surface 32, and along the airflow direction, the extended surface of the first arcuate guide surface intersects with the second outlet surface, and the extended surface of the second arcuate guide surface intersects with the first outlet surface. In order to ensure the above-mentioned implementation results, in this embodiment, the first arcuate guide surface 21 and the second arcuate guide surface 31 are constructed to have different arc radii. In this embodiment, the arc radius of the first arcuate guide surface 21 is smaller than the arc radius of the second arcuate guide surface 31.

[0068] Furthermore, the arc radius of the first arc-shaped guide surface 21 is four times the arc radius of the second arc-shaped guide surface 31, so that it can be ensured that the intersection of the extended surface of the first arc-shaped guide surface 21 and the second outlet surface 32 or the intersection of the extended surface of the second arc-shaped guide surface 31 and the first outlet surface 22 is located as close as possible to the air outlet end of the air outlet gap, that is, the intersection point of the airflow of the first wind wall 2 and the second wind wall 3 is close to the air outlet end of the air outlet gap, preventing the above-mentioned intersection point from intersecting on the first arc-shaped guide surface or the second arc-shaped guide surface, causing the airflow to flow back along the arc surface, thereby forming a convection problem again.

[0069] In some other embodiments, the effect is better when the multiple ratio of the above arc radius relationship is greater than four times.

[0070] like Figure 1 and Figure 2 As shown in FIG. 1 , the first outflow surface 22 and the second outflow surface 32 are both constructed as flat surfaces. The plane is easy to process, and the air outlet gap formed by the two planes has a strong ability to change the direction of the airflow, which can improve the direct injection ability of the airflow at the air outlet gap and prevent the airflow from diverging to the surroundings and affecting the speed of the outflow.

[0071] Furthermore, the air outlet gap in this embodiment is configured to be 3 mm.

[0072] like Figure 3 As shown in the figure, a first transition flow surface 23 is formed between the first curved guide surface 21 and the first outlet flow surface 22, and a second transition flow surface 33 is formed between the second curved guide surface 31 and the second outlet flow surface 32, which can realize smooth transition of the airflow to the first outlet flow surface 22 and the second outlet flow surface 32 when the airflow flows along the first curved guide surface 21 and the second curved guide surface 31, thereby reducing the wind resistance caused by the break difference at the flow surface.

[0073] like Figure 4 and Figure 5 As shown, the air outlet duct 1 in this embodiment has a DC air duct 11 arranged along the height direction of the head assembly and a first redirecting flow channel 12 connected to the upper end of the DC air duct 11 along the air flow direction, and there is an outlet angle A between the outlet direction of the first redirecting flow channel 12 and the horizontal outlet direction, and the outlet angle A is [20°, 40°]. The setting of the above-mentioned outlet angle enlarges the maximum outlet angle at the upper end of the bladeless fan. Compared with the design in the prior art that the outlet direction is perpendicular to the user, the upper air outlet of the bladeless fan in this embodiment is set at an upward inclination. When facing users of different heights, it can satisfy the user's head as much as possible and obtain an effective blowing effect, thereby improving the user's product experience. The outlet angle A in this embodiment is 30°, which can meet the above-mentioned user needs while preventing the problem of air waste caused by excessive outlet angles.

[0074] Example 2

[0075] like Figure 6 to Figure 7 As shown, an air duct system provided for this embodiment includes: the head assembly in the above-mentioned embodiment 1; an air inlet assembly 4, which is installed below the power device 5, and the external air flows into the power device 5 through the air inlet assembly 4; a guide assembly 6, which is covered on the power device 5, and its air outlet end is connected to the air outlet duct 1.

[0076] Specifically, Figure 7 As shown in , the air inlet assembly 4 includes: an air inlet wall 41, which is annular and has a plurality of air inlet structures arranged thereon. The air inlet structure in this embodiment is a circular air inlet hole, and the external airflow enters the air duct system through the air inlet hole under the action of negative pressure. Since the initial air inlet direction is basically parallel to the axial direction of the air duct, a plurality of guide plates 42 are installed in the middle of the air inlet wall 41. The guide plates 42 are plate-shaped structures that are vertically arranged and have a certain air inlet gap between each other. The external airflow is directed to the power device 5 after changing direction through the guide plates 42; and a collector 43, which is arranged above the guide plates 42. The airflow guided by the guide plates 42 flows directly into the collector 43. The air outlet end of the collector 43 is connected to the power device 5. Part of the function of the power device 5 is to provide the above-mentioned negative pressure effect.

[0077] like Figure 7 As shown in the figure, the collecting cover 43 is constructed in a trumpet shape. The collecting cover 43 of this shape can enhance the ability to collect external airflow and increase the air volume. At the same time, the position of the contraction port on the collecting cover 43 can increase the speed of the airflow, which can effectively gain the final wind speed.

[0078] like Figure 6 As shown in FIG. 1 , the guide assembly 6 includes: a second deflection channel 61, in which a plurality of deflection blades are formed, and the deflection blades guide the rotating airflow from the power device 5 into a straight airflow; a diffusion channel 62, whose air inlet end is connected to the second deflection channel 61, and whose air outlet end is connected to the air outlet duct 1. A first diffusion surface 621 and a second diffusion surface 622 are arranged opposite to each other at the connection between the diffusion channel 62 and the air outlet duct 1, and the first diffusion surface 621 and the second diffusion surface 622 are respectively connected to the first wind wall 2 and the second wind wall 3, and the first diffusion surface 621 and the second diffusion surface 622 are constructed as arc surfaces arranged parallel to each other, wherein the structural features of the first diffusion surface 621 and the second diffusion surface 622 ensure that the gas flows smoothly when passing through the diffusion channel, and the parallel arrangement ensures that the turning angle of the gas is small when it flows, which can effectively reduce the pressure loss caused by the turning and the wall resistance, thereby ensuring the final air volume and wind pressure.

[0079] Example 3

[0080] like Figure 8As shown, a fan provided in this embodiment, specifically a bladeless fan, includes the air duct system in the above-mentioned embodiment 2, which specifically includes an air outlet duct 1 and an air inlet component 4, a power device 5 and a corresponding guide component 6, and has all its technical advantages, which will not be repeated here one by one.

[0081] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A head assembly, comprising an air outlet duct (1) and an air guide plate, wherein a plurality of the air guide plates divide the air outlet duct into a plurality of air outlet portions, characterized in that: The air outlet portion comprises a first air wall (2) and a second air wall (3) arranged opposite to each other, wherein: The first wind wall (2) comprises a first arc-shaped flow-guiding surface (21) and a first outflow surface (22) connected to the first arc-shaped flow-guiding surface (21) along the airflow direction; The second wind wall (3) comprises a second arc-shaped flow-guiding surface (31) and a second outflow surface (32) connected to the second arc-shaped flow-guiding surface (31) along the airflow direction; An air outlet gap is formed between the first outlet surface (22) and the second outlet surface (32), and along the airflow direction, an extension surface of the first arc-shaped guide surface (21) intersects with the second outlet surface (32), and an extension surface of the second arc-shaped guide surface (31) intersects with the first outlet surface (22); The first arc-shaped flow-guiding surface (21) and the second arc-shaped flow-guiding surface (31) are both constructed as circular arc surfaces; The first arc-shaped flow guiding surface (21) and the second arc-shaped flow guiding surface (31) are constructed to have different arc radii.

2. The head assembly according to claim 1, characterized in that: The first arc-shaped flow-guiding surface (21) and the second arc-shaped flow-guiding surface (31) are constructed so that the radius of one of them is at least four times that of the other.

3. The head assembly according to claim 1 or 2, characterized in that: The first outflow surface (22) and the second outflow surface (32) are both configured as straight surfaces.

4. The head assembly according to claim 3, characterized in that: The air outlet gap is configured to be 3 mm.

5. The head assembly according to claim 1, characterized in that: A first transition flow surface (23) is provided between the first arc-shaped flow guide surface (21) and the first flow outlet surface (22), and a second transition flow surface (33) is provided between the second arc-shaped flow guide surface (31) and the second flow outlet surface (32).

6. The head assembly according to any one of claims 1, 4 or 5, characterized in that: The air outlet duct (1) comprises a direct current duct (11) arranged along the height direction of the head assembly and a first deflecting flow duct (12) connected to the upper end of the direct current duct (11) along the air flow direction.

7. The head assembly according to claim 6, characterized in that: There is an outlet angle A between the outlet direction of the first deflection flow channel (12) and the horizontal outlet direction, and the outlet angle A is greater than or equal to 20 degrees and less than or equal to 40 degrees.

8. The head assembly according to claim 7, characterized in that: The air outlet angle A is 30°.

9. An air duct system, characterized in that: include: The head assembly according to any one of claims 1 to 8; An air inlet assembly (4) is arranged below the power device (5), and external air flows into the power device (5) through the air inlet assembly (4); The air guide component (6) is covered on the power device (5), and its air outlet end is connected to the air outlet duct (1).

10. The air duct system according to claim 9, characterized in that: The air inlet assembly (4) comprises: The air inlet wall (41) is annular and has a plurality of air inlet structures disposed thereon; A guide plate (42) is arranged in the middle of the air inlet wall (41), and the external airflow is directed to the power device (5) after being changed in direction by the guide plate (42); and a flow collecting cover (43), which is arranged above the guide plate (42) and has an air outlet end connected to the power device (5).

11. The air duct system according to claim 10, characterized in that: The collecting cover (43) is configured in a trumpet shape.

12. The air duct system according to any one of claims 9 to 11, characterized in that: The flow guide component (6) comprises: a second deflection flow channel (61) in which a plurality of deflection blades are arranged, wherein the deflection blades guide the rotating airflow from the power device (5) into a straight airflow; The diffuser flow channel (62) has an air inlet end connected to the second direction-changing flow channel (61) and an air outlet end connected to the air outlet duct (1).

13. The air duct system according to claim 12, characterized in that: A first diffusion surface (621) and a second diffusion surface (622) arranged opposite to each other are provided at the connection between the diffusion flow channel (62) and the air outlet duct (1), and the first diffusion surface (621) and the second diffusion surface (622) are respectively connected to the first wind wall (2) and the second wind wall (3).

14. The air duct system according to claim 13, characterized in that: The first diffusion surface (621) and the second diffusion surface (622) are constructed as arc surfaces arranged parallel to each other.

15. A fan, characterized in that: include: The head assembly according to any one of claims 1 to 8; Or the air duct system as described in any one of claims 9 to 14.

16. The fan according to claim 15, characterized in that The fan is a bladeless fan.

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