Fan and air treatment equipment

Abstract

The embodiment of the utility model discloses a fan and air treatment equipment, and the fan comprises a first air guide part which comprises a first air guide surface; the second air guide piece comprises a second air guide face, and the first air guide face and the second air guide face are arranged at intervals; the blades are connected between the first air guide surface and the second air guide surface; the first air guide surface forms a curved surface which is convex outwards or concave inwards in the radial direction of the fan; and / or the second air guide surface forms a curved surface which is convex outwards or concave inwards along the radial direction of the fan.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, and in particular to a fan and an air treatment device. BACKGROUND

[0002] In the air treatment device in the related art, when the fan inhales air, it is difficult to form a stable upward airflow, which reduces the air supply performance of the fan and thus reduces the air treatment efficiency of the air treatment device. SUMMARY

[0003] Embodiments of the present application disclose a fan which can stably inhale air to improve the air supply efficiency of the fan and thus improve the purification efficiency of the air treatment device.

[0004] In a first aspect, embodiments of the present application disclose a fan, comprising: a first air guide member comprising a first air guide surface; a second air guide member comprising a second air guide surface, the first air guide surface and the second air guide surface being spaced apart; a plurality of blades connected between the first air guide surface and the second air guide surface; wherein the first air guide surface is formed as a curved surface which is convex or concave along a radial direction of the fan; and / or the second air guide surface is formed as a curved surface which is convex or concave along the radial direction of the fan.

[0005] In a possible implementation manner of the first aspect, the first air guide member comprises a rotating shaft mounting portion and a first air guide portion connected to a circumferential side of the rotating shaft mounting portion, the first air guide portion comprises the first air guide surface, and the first air guide portion extends in a curved manner relative to an axial direction of the fan; the second air guide member is spaced apart from the first air guide member along the axial direction, and the second air guide member comprises an air suction portion for inhaling air and a second air guide portion connected to a circumferential side of the air suction portion, the second air guide portion comprises the second air guide surface, and the second air guide portion extends in a curved manner relative to the axial direction.

[0006] In a possible implementation manner of the first aspect, in an axial cross section of the fan, a length L1 of a cross line of the first air guide surface is less than or equal to a length L2 of a cross line of the second air guide surface.

[0007] In a possible implementation manner of the first aspect, in an axial cross section of the fan, the cross line of the first air guide surface and the cross line of the second air guide surface are both curved lines.

[0008] In a possible implementation manner of the first aspect, the cross line of the first air guide surface comprises a first curved line; the cross line of the second air guide surface comprises a second curved line; and a radius of curvature R1 of the first curved line is substantially equal to a radius of curvature R2 of the second curved line.

[0009] In a possible implementation manner of the first aspect, in the axial section of the fan, the second air guide part is formed with a first tangent line tangent to the second air guide surface at the connection with the suction part, and the outer peripheral end of the second air guide part is formed with a second tangent line tangent to the second air guide surface.

[0010] The first tangent line forms a first included angle θ1 with the axis of the fan, and the second tangent line forms a second included angle θ2 with the axis, where θ1> θ2.

[0011] In a possible implementation manner of the first aspect, 10° < θ1- θ2 < 20°.

[0012] In a possible implementation manner of the first aspect, in the axial section of the fan, the second air guide part is formed with a first tangent line tangent to the second air guide surface at the connection with the suction part, and the first air guide part is formed with a third tangent line tangent to the first air guide surface at the connection with the shaft mounting part.

[0013] The first tangent line forms a first included angle θ1 with the axis of the fan, and the third tangent line forms an included angle θ3 with the axis, where θ3≥ θ1.

[0014] In a possible implementation manner of the first aspect, along the radial direction of the fan, the outflow end of the suction part has a first spacing H1 from the axis of the fan, and the outer peripheral end of the first air guide part has a second spacing H2 from the axis, where H1 < H2.

[0015] In a possible implementation manner of the second aspect, the first air guide part comprises a first air guide part extending obliquely to the radial direction of the fan, and the second air guide part comprises a second air guide part extending obliquely to the radial direction of the fan, the first air guide part and the second air guide part are arranged in a spaced manner, and a plurality of blades are connected between the first air guide part and the second air guide part; wherein the first air guide part has an obliquely extending extension length L3, the second air guide part has an obliquely extending extension length L4, and L3≤ L4.

[0016] In a possible implementation manner of the second aspect, the first air guide part comprises a shaft mounting part, and the first air guide part is connected to the peripheral side of the shaft mounting part.

[0017] The second air guide part comprises a suction part for sucking air, and the second air guide part is connected to the peripheral side of the air suction part.

[0018] In a possible implementation manner of the second aspect, in the axial section of the fan, the first air guide part and the second air guide part both extend along a straight line; or,

[0019] In an axial cross section of the fan, one of the first air guide part and the second air guide part extends along a straight line, and the other extends along a curve; or,

[0020] In an axial cross section of the fan, both the first air guide part and the second air guide part extend along a curve.

[0021] In a possible implementation manner of the second aspect, along a radial direction of the fan, a first distance H1 is between an air outlet end of the air suction part and an axis of the fan, and a second distance H2 is between an outer circumferential end of the first air guide part and the axis, and H1 < H2.

[0022] In a possible implementation manner of the second aspect, an inclination angle θ4 of the first air guide part is greater than or equal to an inclination angle θ5 of the second air guide part, the inclination angles being angles between the first air guide part or the second air guide part and an axis of the fan.

[0023] The third aspect of the present application provides a fan, comprising: a first air guide part; a second air guide part, the first air guide part and the second air guide part being spaced apart; a plurality of blades connected between the first air guide part and the second air guide part; wherein along a radial direction of the fan, a first distance H1 is between an end of the second air guide part close to an upstream side of the fan and an axis of the fan, and a second distance H2 is between an outer circumferential end of the first air guide part and the axis, and H1 < H2.

[0024] In a possible implementation manner of the third aspect, the first air guide part comprises a shaft mounting part, and the first air guide part is connected to a circumferential side of the shaft mounting part.

[0025] The second air guide part comprises an air suction part for sucking air, and the second air guide part is connected to a circumferential side of the air suction part.

[0026] In a possible implementation manner of the third aspect, in an axial cross section of the fan, both the first air guide part and the second air guide part extend along a straight line; or,

[0027] In an axial cross section of the fan, one of the first air guide part and the second air guide part extends along a straight line, and the other extends along a curve; or,

[0028] In an axial cross section of the fan, both the first air guide part and the second air guide part extend along a curve.

[0029] In a possible implementation manner of the third aspect, in the axial section of the fan, the first air guide part extends by a length L3, and the second air guide part extends by a length L4, where L3≤L4.

[0030] In a possible implementation manner of the third aspect, an inclination angle θ4 of the first air guide part is greater than or equal to an inclination angle θ5 of the second air guide part, the inclination angle being an included angle between the first air guide part or the second air guide part and an axis of the fan.

[0031] In a possible implementation manner of the third aspect, in the axial section of the fan, a first connecting line is formed between an end of the second air guide part close to an upstream side of the fan and an outer circumferential end of the first air guide part, and the first connecting line intersects the axis of the fan.

[0032] The fourth aspect of the present application provides a fan, comprising: a first air guide part; a second air guide part, the first air guide part and the second air guide part being spaced apart; a plurality of blades connected between the first air guide part and the second air guide part; an inclination angle θ4 of the first air guide part being greater than or equal to an inclination angle θ5 of the second air guide part, the inclination angle being an included angle between the first air guide part or the second air guide part and an axis of the fan.

[0033] The fifth aspect of the present application provides an air treatment device, comprising the fan provided in any of the above aspects.

[0034] Compared with the prior art, the present application has the following beneficial effects:

[0035] The fan provided by the embodiments of the present application configures at least one of the first air guide surface and the second air guide surface connected to the blades as a curved surface. Since the airflow is more likely to form the Coanda effect on the curved surface, the vortex and turbulence phenomena in the air outlet duct can be reduced, and the airflow can be more stably sucked into and flowed out of the fan, thereby improving the air supply performance of the fan.

[0036] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0038] Figure 1A cross-sectional view of a fan provided by an embodiment of the present application;

[0039] Figure 2 A cross-sectional view of a fan provided by an embodiment of the present application;

[0040] Figure 3 A cross-sectional view of a fan provided by an embodiment of the present application;

[0041] Figure 4 A cross-sectional view of a fan provided by an embodiment of the present application;

[0042] Figure 5 A partial schematic view of a blade in a fan provided by an embodiment of the present application.

[0043] Explanation of reference numerals:

[0044] 100 - fan;

[0045] 10 - first air guide; 101 - first air guide portion; 1011 - first air guide surface; 1012 - first curve; 102 - rotation shaft mounting portion;

[0046] 20 - second air guide; 201 - second air guide portion; 2011 - second air guide surface; 2012 - second curve; 202 - suction portion; air outlet end 2021;

[0047] A - air outlet air duct;

[0048] 30 - blade; 301 - root portion; 302 - tail portion; 303 - leading edge; 304 - trailing edge;

[0049] 40 - outer shell; 401 - air outlet; B - air supply air duct;

[0050] 50 - inner shell;

[0051] 60 - drive; 601 - drive shaft. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0053] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0054] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned partial terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific situation.

[0055] In addition, the terms "mounting", "setting", "provided with", "connected", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific situation.

[0056] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components (the specific type and structure can be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0057] Please refer to Figures 1 to 4 The fan 100 provided by the embodiments of the present application comprises a first air guide 10, a second air guide 20 and a blade 30 connected to the first air guide 10 and the second air guide 20. The first air guide 10 is used to connect a driving member 60, which drives the first air guide 10 to rotate, thereby driving the entire fan 100 to rotate, thereby driving the air around the fan 100 to flow.

[0058] The first air guide 10 can comprise a first air guide surface 1011. The second air guide can comprise a second air guide surface 2011. The second air guide surface 2011 and the first air guide surface 1011 can be spaced apart along the axial direction of the fan 100. The space between the first air guide surface 1011 and the second air guide surface 2011 is referred to as the air outlet air duct A in the embodiments of the present application.

[0059] The blades 30 are connected between the first air guide surface 1011 and the second air guide surface 201, and a plurality of blades 30 are arranged at intervals in the circumferential direction of the fan 100. It can be understood that the blades 30 connected between the first air guide surface 1011 and the second air guide surface 201 can mean that part or all of the plurality of blades 30 are connected between the first air guide surface 1011 and the second air guide surface 201. When the fan 100 rotates, the blades 30 pressurize and push the airflow outward and upward, thereby increasing the pressure and flow rate of the airflow, so that the airflow can flow out quickly and has a large lift.

[0060] In some embodiments, at least one of the first air guide surface 1011 and the second air guide surface 2011 is configured as a curved surface. That is, both the first air guide surface 1011 and the second air guide surface 2011 can be curved surfaces; or the first air guide surface 1011 is a curved surface, and the form of the second air guide surface 2011 is not limited by the embodiments of the present application, or the second air guide surface 2011 is a curved surface, and the form of the first air guide surface 1011 is not limited by the embodiments of the present application.

[0061] In some embodiments, the first air guide surface 1011 can be a curved surface that is convex in the radial direction of the fan 100, and the second air guide surface 2011 can be a curved surface that is convex in the radial direction of the fan 100.

[0062] In some embodiments, the first air guide surface 1011 can be a curved surface that is concave in the radial direction of the fan 100, and the second air guide surface 2011 can be a curved surface that is concave in the radial direction of the fan 100.

[0063] It can be understood that in addition to the blades 30 for pushing the airflow, the first air guide surface 1011 is used for guiding the airflow, and when the first air guide surface 1011 is configured as a curved surface, the airflow will more easily form a Coanda effect on the first air guide surface 1011. The Coanda effect refers to the phenomenon that a fluid tends to flow along a curved surface when passing through the curved surface. When the airflow flows along the curved first air guide surface 1011, the Coanda effect is easily formed, and the airflow flows along the curved surface of the first air guide surface 1011, so that the first air guide surface 1011 can more effectively guide the airflow, thereby improving the aerodynamic efficiency of the fan 100. In addition, it also helps to reduce the airflow separation of the airflow on the first air guide surface 1011, that is, to reduce the generation of vortexes and turbulent flows, thereby reducing aerodynamic noise.

[0064] In addition, the second air guide surface 2011 is also used for guiding the airflow. When the airflow flows along the curved second air guide surface 2011, the Coanda effect is easily formed, and the airflow flows along the curved surface of the second air guide surface 2011, so that the second air guide surface 2011 can more effectively guide the airflow, thereby improving the aerodynamic efficiency of the fan 100. In addition, it also helps to reduce the airflow separation of the airflow on the second air guide surface 2011, that is, to reduce the generation of vortexes and turbulent flows, thereby reducing aerodynamic noise.

[0065] Thus, the fan 100 provided by the embodiments of the present application is configured to form the first air guide surface 1011 and the second air guide surface 2011 connected to the blade 30 into a curved surface. Since the airflow is more likely to form the Coanda effect on the curved surface, the vortex and turbulence phenomena in the air outlet duct can be reduced, and the airflow can be more stably sucked into and discharged out of the fan 100, thereby improving the air supply performance of the fan 100.

[0066] In some embodiments, as shown in Figure 1 The fan 100 can include a housing 40, and a top portion of the housing 40 is generally provided with an air outlet 401 to facilitate the fan 100 to achieve top air supply. The first air guide member 10 and the second air guide member 20 are both arranged in the housing 40, and the second air guide member 20 is farther away from the air outlet 401 than the first air guide member 10 along the axial direction of the fan 100. The bottom portion of the housing 40 has a second air guide member 20 assembly opening, which is also used for air inlet.

[0067] In some embodiments, as shown in Figure 1 The fan 100 can include an inner housing 50 connected to the housing 40 and used for mounting the driving member 60. The inner housing 50 and the housing 40 form a part of the air supply duct B therebetween, and the air supply duct B is in communication with the air outlet 401. The air outlet duct A can be in communication with the air supply duct B.

[0068] In some embodiments, as shown in Figure 2 The first air guide member 10 can include a rotating shaft mounting portion 102, and the rotating shaft mounting portion 102 can include a mounting shaft hole used for connecting a driving shaft 601 of the driving member 60. Since the fan 100 is connected to the driving member 60, the fan 100 has an axial direction and a radial direction. The axial direction of the fan 100 can be the axial extension direction of the rotating shaft mounting portion 102 / mounting shaft hole, and the radial direction can be a direction perpendicular or close to perpendicular to the axial direction.

[0069] It can be understood that, in order to enhance the stable mounting and efficient driving connection of the fan 100 and the driving member 60, the rotating shaft mounting portion 102 can be configured as a structure extending along the radial direction.

[0070] As shown in Figure 2 The first air guide member 10 can include a first air guide portion 101. The first air guide portion 101 can be configured as a ring-shaped structure. The first air guide portion 101 is connected to the circumferential side of the rotating shaft mounting portion 102, that is, the first air guide portion 101 surrounds the outer periphery of the rotating shaft air guide portion.

[0071] As shown in Figure 2 The second air guide member 20 can include a suction portion 202. The suction portion 202 can include a suction port used for sucking the airflow around the fan 100.

[0072] As shown in Figure 2 , the second air guide 20 can include a second air guide portion 201. The second air guide portion 201 can be configured as a ring-like structure. The second air guide portion 201 is connected to the circumferential side of the suction portion 202, that is, the second air guide portion 201 surrounds the outer periphery of the suction portion 202.

[0073] For ease of description, as shown in Figure 2 , the space between the first air guide portion 101 and the second air guide portion 201 is referred to as the air outlet air duct A in the embodiments of the present application.

[0074] In some embodiments, the first air guide portion 101 extends away from the second air guide 20 while expanding radially outward from the connection position with the shaft mounting portion 102. The first air guide portion 101 extends in the above direction while being curved, forming a curved structure relative to the axial direction of the fan 100. The first air guide portion 101 has the effect of guiding the airflow to flow upward.

[0075] As shown in Figure 2 , the first air guide portion 101 includes the first air guide surface 1011 connected with the blade 30. Due to the bending of the first air guide portion 101, the first air guide surface 1011 forms a curved surface that is convex or concave in the radial direction.

[0076] In some embodiments, as shown in Figure 2 , the second air guide portion 201 extends toward the first air guide 10 while expanding radially outward from the connection position with the suction portion 202. The second air guide portion 201 extends in the above direction while being curved, forming a curved structure relative to the axial direction of the fan 100. The second air guide portion 201 has the effect of guiding the airflow to flow upward.

[0077] As shown in Figure 2 , the second air guide portion 201 includes the second air guide surface 2011 connected with the blade 30. Due to the bending of the second air guide portion 201, the second air guide surface 2011 forms a curved surface that is convex in the radial direction.

[0078] In some embodiments, the first air guide portion 101 and the second air guide portion 201 both have a curved extension structure.

[0079] In some embodiments, the first air guide portion 101 can have a curved extension structure, and the second air guide portion 201 has other structural forms, for example, the second air guide portion 201 can be a straight extension structure.

[0080] In some embodiments, the second air guide portion 201 can have a curved extension structure, and the first air guide portion 101 has other structural forms, for example, the first air guide portion 101 can be a straight extension structure.

[0081] It can be understood that as long as at least one of the first air guide part 101 and the second air guide part 201 has a curved extension, that is, at least one of the first air guide surface 1011 and the second air guide surface 2011 is configured as a curved surface, it can help to form a Coanda effect for the airflow sucked from the suction part 202 along the curved air guide surface, thereby beneficially guiding the flow of the airflow, more conducive to the air being sucked from the suction part 202 and stably flowing out from the air outlet duct, reducing the airflow separation of the airflow on the first air guide surface 1011 and / or the second air guide surface 2011, thereby improving the aerodynamic efficiency of the fan 100.

[0082] It should be noted that due to the centrifugal force generated when the fan 100 rotates, the flow rate of the airflow flowing through the second air guide surface 2011 is larger, and the second air guide surface 2011 is closer to the suction part 202. By configuring the second air guide surface 2011 as a curved surface, the stability of the airflow flowing along the curved surface can be further enhanced, which helps to reduce the backflow of air at the suction part 202, thereby improving the air suction efficiency of the fan 100, enabling the two sides of the fan 100 along the axial direction to maintain a relatively stable pressure difference, and further improving the overall performance and ventilation effect of the fan 100.

[0083] The fan 100 has an axial cross section passing through the axis o-o of the fan 100, or the axial cross section passing through the drive shaft 601 of the driving member 60.

[0084] In some embodiments, the first air guide surface 1011 is a curved surface, so in one axial cross section of the fan 100, the first air guide surface 1011 forms a cross line. The cross line can be understood as the profile line of the first air guide surface 1011 in the axial cross section, and the length of the cross line of the first air guide surface 1011 is L1.

[0085] In some embodiments, the second air guide surface 2011 is a curved surface, so in one axial cross section of the fan 100, the second air guide surface 2011 forms a cross line, which can be understood as the profile line of the second air guide surface 2011 in the axial cross section, and the length of the cross line formed by the second air guide surface 2011 is L2, wherein L1≤L2.

[0086] By setting the length L2 of the cross line formed by the second air guide surface 2011 to be longer than the length L1 of the cross line formed by the first air guide surface 1011, the second air guide surface 2011 can further guide the airflow along the second air guide surface 2011 that is long enough to the direction close to the first air guide part 10, that is, guide the airflow upward to reduce the contact between the airflow flowing out of the fan 100 and the shell 40 of the fan 100, thereby reducing the generation of noise.

[0087] Furthermore, since the second air guide surface 2011 is closer to the intake part 202, the length L2 of the cross-section formed by the second air guide surface 2011 is set to be longer, which can further increase the length of the airflow along the second air guide surface 2011, making the path of stable airflow longer, reducing the phenomenon of airflow reflow from the intake part 202, and making the two sides of the fan 100 have a stable pressure difference, thereby improving the stability of airflow.

[0088] It should be noted that since the fan 100 will generate centrifugal force on the airflow when it rotates, the flow rate of the airflow in contact with the second air guide surface 2011 will be greater than the flow rate of the airflow in contact with the first air guide surface 1011. Setting the length L2 of the second curve 2012 to be longer than the length L1 of the first curve 1012 can further improve the airflow guiding effect of the fan 100.

[0089] In some embodiments, such as Figure 3 As shown, in the axial section of the fan 100, the cross-section of the first air guide surface 1011 includes the first curve 1012, and the cross-section of the second air guide surface 2011 includes the second curve 2012.

[0090] The radius of curvature of the first curve 1012 is R1, and the radius of curvature of the second curve 2012 is R2, where R1 is approximately equal to R2. Here, R1 being approximately equal to R2 can mean that R1 = R2, or that R1 and R2 are approximately equal.

[0091] The radius of curvature R2 of the second curve 2012 is basically equal to the radius of curvature R1 of the first curve 1012. In this way, the distance between the first air guide 101 and the second air guide 201 is kept balanced, and the airflow can be more stable when it flows through the air outlet duct A. This reduces the turbulence and chaotic flow that may be caused by the large difference in the width of the air outlet duct A, thereby increasing the airflow through the fan 100 and thus improving the overall aerodynamic efficiency of the fan 100.

[0092] In some embodiments, such as Figure 3 As shown, in a cross-section along the axial direction of the fan 100, a first tangent line La is formed that is tangent to the second air guide surface 2011. The first tangent line La passes through the connection point between the intake section 202 and the second air guide section 201. In this cross-section, a second tangent line Lb is also formed that is tangent to the second air guide surface 2011. The second tangent line Lb passes through the outer end of the second air guide section 201, that is, the second tangent line Lb passes through the free end or the outlet end of the second air guide section 201.

[0093] In this design, the first tangent La forms a first angle θ1 with the axis oo of the fan 100, and the second tangent Lb forms a second angle θ2 with the axis oo of the fan 100, where θ1 > θ2. Thus, the second air guide surface 2011 tends to extend upwards, and its outer periphery may tend to be biased towards the axis oo of the fan 100. That is, the extension of the second air guide surface 2011 tends to extend towards the air outlet 401 located at the top of the fan 100, and the airflow will undergo a certain degree of deflection as it flows along the second air guide surface 2011.

[0094] Based on the Coanda effect, the airflow still tends to flow along the guiding direction defined by the second air guide surface 2011 after it flows out of the second air guide surface 2011. Since the second air guide surface 2011 tends to extend towards the air outlet 401, the airflow flowing out of the second air guide surface 2011 will also flow towards the air outlet 401, thereby reducing the collision and friction between the airflow and the side wall of the outer casing 40 of the fan 100, thus reducing the abnormal noise caused by air turbulence.

[0095] It should be noted that since the fan 100 will generate centrifugal force on the airflow when it rotates, the flow rate and velocity of the airflow in contact with the second air guide surface 2011 will be greater than the flow rate and velocity of the airflow in contact with the first air guide surface 1011. It can be understood that the guiding effect of the second air guide surface 2011 is more obvious than that of the first air guide surface 1011. Therefore, the extension direction of the second air guide surface 2011 is limited as described above, which makes the effect of guiding the airflow toward the air outlet 401 more obvious.

[0096] In some embodiments, 10°≤θ1-θ2≤20°.

[0097] In this way, the curvature change of the second air guide surface 2011 can be kept within a suitable small range, so that the change of the flow direction of the airflow along the second air guide surface 2011 is relatively gentle, reducing the wind trough that is easily generated when the flow direction of the airflow changes too much. Such wind trough will reduce the air volume of the fan 100.

[0098] For example, the angle difference between the first included angle θ1 and the second included angle θ2 can be 10°, 13°, 15°, 17° or 20°, etc.

[0099] In some embodiments, such as Figure 4 As shown, in a cross section along the axial direction of the fan 100, a third tangent line Lc is formed that is tangent to the first air guide surface 1011. The third tangent line Lc passes through the connection point between the shaft mounting part 102 and the first air guide part 101.

[0100] Among them, the third tangent Lc forms a third included angle θ3 with the axis oo of fan 100, where θ3≥θ1.

[0101] It can be understood that, since the second air guide surface 2011 is relatively close to the suction part 202, θ3≥θ1, the second air guide surface 2011 and the bending angle formed at the connection part of the suction part 202 can be relatively small, and the energy loss caused by the rapid change of the air suction outlet air duct A can be reduced. At the same time, the outlet air duct A between the first air guide surface 1011 and the second air guide surface 2011 can also gradually narrow from the inlet side to the outlet side, which is equivalent to gradually compressing the airflow therein, so that a stable pressure difference is formed on both sides of the fan 100 in the axial direction, thereby enhancing the air supply efficiency and overall performance of the fan 100.

[0102] Further, in order to limit the narrowing degree of the outlet air duct A, the difference between the third included angle and the first included angle can be further limited. For example, 0°<θ3-θ1<5°.

[0103] The application provides a fan 100, as shown in the drawings, which comprises a first air guide part 10, a second air guide part 20 and a plurality of blades 30. The first air guide part 10 comprises a first air guide part 101, and the second air guide part 20 comprises a second air guide part 201. Figure 3 The fan 100 comprises a first air guide part 10, a second air guide part 20 and a plurality of blades 30. The first air guide part 10 comprises a first air guide part 101, and the second air guide part 20 comprises a second air guide part 201.

[0104] The first air guide part 101 of the fan 100 of the embodiment extends obliquely to the radial outer side of the fan 100, and the second air guide part 201 extends obliquely to the radial outer side of the fan.

[0105] Specifically, the second air guide part 201 extends to the radial outer side while being inclined relative to the axial direction of the fan 100. The specific oblique extension direction is gradually away from the suction part 202 of the fan 100, that is, inclined upward. The second air guide part 201 extends to the radial outer side while being inclined relative to the axial direction of the fan 100. The specific oblique extension direction is gradually close to the outlet 401 of the fan 100, that is, inclined upward.

[0106] The length of the oblique extension of the first air guide part 101 is L3, and the length of the oblique extension of the second air guide part 201 is L4, L3≤L4.

[0107] It should be noted that the oblique extension of the first air guide part 101 and the second air guide part 201 in the embodiment refers to the direction of the extension trend of the first air guide part 101 and the second air guide part 201, and does not limit the specific shape of the first air guide part 101 and the second air guide part 201.

[0108] It should be noted that, since the fan 100 will generate centrifugal force when rotating, the flow rate and flow velocity of the airflow in contact with the second air guide part 201 will be greater than the flow rate and flow velocity of the airflow in contact with the first air guide part 101. When the airflow flows through the surface of an object, the airflow needs to overcome friction. Since the flow velocity generated by the airflow in contact with the first air guide part 101 is lower than the flow velocity generated by the airflow in contact with the second air guide part 201, the ability of the airflow to overcome friction is relatively weak, and the airflow is more likely to form multiple small vortexes on the first air guide part 101, which can cause the airflow to flow back outside the suction part 202 and reduce the overall flow rate of the airflow.

[0109] In this embodiment, the extension length L3 of the first air guide part 101 is shortened, which can reduce the contact area of the airflow with the first air guide part 101, thereby reducing the formation of vortexes and enabling the airflow to flow out of the air outlet duct A more smoothly. In addition, the extension length L4 of the inclined second air guide part 201 is set to be longer, so that the second air guide part 201 can further guide the airflow along the second air guide surface 2011 that is long enough to be close to the air outlet 401, so that the fan 100 has a stable pressure difference on both sides of the shaft, thereby improving the air supply efficiency of the fan 100.

[0110] In addition, the extension length L4 of the inclined second air guide part 201 is set to be longer, so that the second air guide part 201 can further guide the airflow along the second air guide surface 2011 that is long enough to be close to the air outlet 401, so that the fan 100 has a stable pressure difference on both sides of the shaft, thereby improving the air supply efficiency of the fan 100.

[0111] The linear velocity formula of the airflow flowing through the surface of an object is v = ωr, where v is the linear velocity, ω is the angular velocity, and r is the distance from the object to the center of rotation.

[0112] The fan 100 will generate angular velocity when rotating. The extension length of the second air guide part 201 is longer, so that the outer peripheral end of the second air guide part 201 is farther away from the axis o-o of the fan 100 than the outer peripheral end of the first air guide part 101, that is, the linear velocity of the airflow at the outer peripheral end of the second air guide part 201 is significantly greater than the linear velocity of the airflow at the outer peripheral end of the first air guide part 101. Based on the centrifugal force of the fan 100, the flow rate and flow velocity of the airflow flowing through the second air guide part 201 are higher, thereby improving the overall air supply efficiency of the fan 100.

[0113] In some embodiments, in a cross section along the axial direction of the fan 100, the first air guide part 101 and the second air guide part 201 both extend along a straight line.

[0114] In some embodiments, in a cross section along the axial direction of the fan 100, one of the first air guide part 101 and the second air guide part 201 extends along a straight line, and the other of the first air guide part 101 and the second air guide part 201 extends along a curve.

[0115] In some embodiments, in an axial cross section of the fan 100, the first air guide part 101 and the second air guide part 201 both extend along a curved surface.

[0116] The technical effects of the first air guide part 101 and / or the second air guide part 201 extending along a curved surface are not repeated here.

[0117] In some embodiments, the inclination angle θ4 of the first air guide part 101 is greater than or equal to the inclination angle θ5 of the second air guide part 201, the inclination angle being the angle between the first air guide part 101 or the second air guide part 201 and the axis of the fan 100. Where the inclination angle θ4 of the first air guide part 101 is greater than or equal to the inclination angle θ5 of the second air guide part 201, the technical effects of θ3>θ1 in the above-mentioned embodiments can be referred to, and are not repeated here. Figure 3

[0118] It can be understood that, in the axial cross section of the fan 100, when the first air guide part 101 or the second air guide part 201 is a straight line extending at an inclination, the inclination angle can refer to the angle between any position of the first air guide part 101 or the second air guide part 201 and the axis of the fan 100; in the axial cross section of the fan 100, when the first air guide part 101 or the second air guide part 201 is a curved line extending at an inclination, the inclination angle can refer to the angle between the tangent line at any position of the first air guide part 101 or the second air guide part 201 and the axis of the fan 100 (for reference to the above-mentioned embodiments and the corresponding embodiments of the present application). Figure 4

[0119] The embodiments of the present application provide a fan 100, as shown in Figure 4 The fan 100 includes a first air guide part 101, a second air guide part 201, and a plurality of blades 30.

[0120] The fan 100 of the present embodiments does not specifically limit the shapes of the first air guide part 101 and the second air guide part 201, and the first air guide part 101 and the second air guide part 201 can extend at an inclination along a straight line or extend at an inclination along a curved line.

[0121] In the radial direction of the fan 100, the first distance H1 is between the end of the second air guide part 201 close to the upstream side of the fan 100 and the axis o-o of the fan 100, and the second distance H2 is between the outer circumferential end of the first air guide part 101 and the axis o-o of the fan 100, where H1

[0122] The end of the second air guide part 201 close to the upstream side of the fan 100 can be the end of the second air guide part 201 relatively close to the suction side. It can be understood that the upstream side and the downstream side are related to the direction of gas flow, and the gas generally flows from the upstream side to the downstream side.​​

[0123] Specifically, the second air guide part 201 is connected with the suction part 202. The end of the second air guide part 201 close to the upstream side of the fan 100 can be the air outlet end 2021 of the suction part 202.

[0124] The suction part 202 can be configured as a hollow cylinder structure. The end of the suction part 202 close to the first air guide part 101 is the air outlet end 2021 of the suction part 202, and the air outlet end 2021 of the suction part 202 is connected with the second air guide part 201.

[0125] H1 < H2, that is, the air outlet end 2021 of the suction part 202 is arranged radially offset from the outer peripheral end of the first air guide part 101, and the outer peripheral end of the first air guide part 101 is farther from the axis o-o.

[0126] It should be noted that after the air flow flows into the air outlet air duct A from the suction part 202, part of the air flow will flow out of the air outlet air duct A along the outer peripheral end of the first air guide part 101. By arranging the air outlet end 2021 of the suction part 202 radially offset from the outer peripheral end of the first air guide part 101 and making the outer peripheral end of the first air guide part 101 farther from the axis o-o, the air flow directly flowing out of the outer peripheral end of the first air guide part 101 from the air outlet end 2021 of the suction part 202 can be reduced, that is, the air flow directly flowing in and out between the first air guide part 101 and the second air guide part 201 without being accelerated by the blades 30. It can be understood that if the air flow directly flows out of the outer peripheral end of the first air guide part 101 without being accelerated by the blades 30, the air supply performance of the fan 100 will be reduced.

[0127] By arranging the air outlet end 2021 of the suction part 202 radially offset from the outer peripheral end of the first air guide part 101, the air flow will be turned to a certain extent after flowing into the air outlet air duct A, the direct in and out of the air flow is reduced, and the air flow is more efficiently contacted with the blades 30 and accelerated by the blades 30, so that the pressure difference between the two sides of the fan 100 is relatively stable, and the air suction capacity of the fan 100 is enhanced.

[0128] In the above embodiment, in a cross section along the axial direction of the fan 100, as shown in Figure 3 the first air guide part 101 extends along a straight line, and the second air guide part 201 extends along a straight line. Alternatively, in the axial cross section of the fan 100, one of the first air guide part 101 and the second air guide part 201 extends along a straight line, and the other extends along a curve; or in the axial cross section of the fan 100, both the first air guide part 101 and the second air guide part 201 extend along a curve.

[0129] In some embodiments, in the axial cross section of the fan 100, the first air guide part 101 extends by a length L3, and the second air guide part 201 extends by a length L4, where L3≤L4. The technical effects of L3≤L4 can refer to the technical effects of L3≤L4 in the above-mentioned embodiments, which will not be repeated here.

[0130] In some embodiments, the inclination angle θ4 of the first air guide part 101 is greater than or equal to the inclination angle θ5 of the second air guide part 201, and the inclination angle is the angle between the first air guide part 101 or the second air guide part 201 and the axis of the fan 100. The technical effects of the inclination angle θ4 of the first air guide part 101 being greater than or equal to the inclination angle θ5 of the second air guide part 201 can refer to the technical effects of θ3>θ1 in the above-mentioned embodiments, which will not be repeated here. Figure 3

[0131] It can be understood that, in the axial cross section of the fan 100, when the first air guide part 101 or the second air guide part 201 is a straight line extending at an inclination, the inclination angle can refer to the angle between any position of the first air guide part 101 or the second air guide part 201 and the axis of the fan 100; in the axial cross section of the fan 100, when the first air guide part 101 or the second air guide part 201 is a curve extending at an inclination, the inclination angle can refer to the angle between the tangent line of any position of the first air guide part 101 or the second air guide part 201 and the axis of the fan 100. Figure 4

[0132] In any of the embodiments of the fan 100 provided in the above-mentioned embodiments of the present application, as shown in Figure 4 in the radial direction of the fan 100, the outlet end 2021 of the suction part 202 and the axis o-o of the fan 100 have a first spacing H1, and the outer peripheral end of the first air guide part 101 and the axis o-o have a second spacing H2, where H1<H2. The beneficial effects can be combined in any of the embodiments of the fan 100 provided in the above-mentioned embodiments of the present application, which will not be repeated here.

[0133] The present application provides a fan 100, as shown in Figure 5 comprising a first air guide part 10, a second air guide part 20, and a plurality of blades 30. The first air guide part 10 comprises a first air guide part 101, and the second air guide part 20 comprises a second air guide part 201.

[0134] The inclination angle θ4 of the first air guide part 101 is greater than or equal to the inclination angle θ5 of the second air guide part 201, and the inclination angle is the angle between the first air guide part 101 or the second air guide part 201 and the axis of the fan 100.

[0135] ​​It can be understood that, since the second air guide part 201 is relatively close to the suction part, θ4> θ5, the second air guide surface 2011 can be made to form a relatively small bending angle at the connection with the suction part 202, reducing the energy loss caused by the rapid change in direction of the air suction and air outlet air duct A. At the same time, the air outlet air duct A between the first air guide surface 1011 and the second air guide surface 2011 gradually narrows from the air inlet side to the air outlet side, which is equivalent to gradually compressing the airflow therein, forming a stable pressure difference on both sides of the fan 100 in the axial direction, thereby enhancing the air supply efficiency and overall performance of the fan 100.

[0136] Further, in order to limit the narrowing degree of the air outlet air duct A, the difference between θ4 and θ5 can be further limited. For example, 0° < θ4- θ5 < 5°.

[0137] It should be noted that the above-mentioned limiting relationship that the inclination angle θ4 of the first air guide part 101 is greater than or equal to the inclination angle θ5 of the second air guide part 201 can also be combined into the fan 100 provided in the above-mentioned embodiments of the present application, and the beneficial effects will not be repeated here.

[0138] In one embodiment which can be combined with any of the above-mentioned embodiments, as shown in Figure 5 The blade 30 includes a root 301 connected to the first air guide surface 1011 and a tail 302 connected to the second air guide surface 2011, the connection length of the root 301 with the first air guide surface 1011 is L5, and the connection length of the tail 302 with the second air guide surface 2011 is L6, wherein L5> L6.

[0139] In order to make the airflow between the blades 30 flow upward better, L5> L6 can make the airflow obtain greater thrust in the root 301 area of the blade 30 when passing through the blade 30, which helps to lift the airflow in the axial direction, thereby enhancing the lift and air supply efficiency of the fan 100.

[0140] In one embodiment which can be combined with any of the above-mentioned embodiments, as shown in ​ The blade 30 includes a leading edge 303 for windward and a trailing edge 304 for air outlet, the leading edge 303 extends along a straight line, and the trailing edge 304 extends along a curve.

[0141] The leading edge 303 of the blade 30 is provided to extend along a straight line, which can improve the airflow cutting efficiency of the blade 30 in the windward surface. The straight-line type leading edge 303 can more directly and effectively contact the airflow from the suction part 202, improving the efficiency of the airflow climbing along the blade 30 and reducing the disturbance and energy loss of the airflow at the leading edge 303 of the blade 30.

[0142] The trailing edge 304 of the blade 30 extends along a curve, which helps to optimize the speed and direction of the airflow flowing out of the blade 30. After the airflow is pushed by the blade 30 during the rotation of the fan 100, the airflow can flow out of the air outlet duct A more smoothly through the curved trailing edge 304, reducing the generation of airflow separation and vortex.

[0143] In this way, the leading edge 303 of the blade 30 extends along a straight line, and the trailing edge 304 of the blade 30 extends along a curve, which can superimpose to improve the air supply uniformity and stability of the fan 100.

[0144] In an embodiment that can be combined with any of the above embodiments, in the axial cross section of the fan 100, a first connection line Ld is formed between the air outlet end 2021 of the suction part 202 and the outer peripheral end of the first air guide part 101, and the first connection line Ld intersects the axis o-o of the fan 100.

[0145] After the airflow flows into the air outlet duct A from the suction part 202, part of the airflow will flow out of the air outlet duct A along the outer peripheral end of the first air guide part 101. The first connection line Ld intersects the axis o-o of the fan 100, so that the airflow entering the air outlet duct A from the suction part 202 can be diverted without directly flowing out of the fan 100 along the axial direction. As introduced above, if the airflow directly flows out of the outer peripheral end of the first air guide part 101 without being accelerated by the blade 30, the air suction performance of the fan 100 will be reduced.

[0146] In an embodiment that can be combined with any of the above embodiments, a plurality of through holes are arranged on the blade 30.

[0147] A plurality of through holes are arranged on the blade 30. These through holes on the blade 30 can be regarded as acoustic filters. When sound waves pass through the blade 30 with a plurality of through holes, the sound waves will rub and collide with the inner walls of the through holes, resulting in the dissipation of sound wave energy. The certain acoustic damping effect of the through holes can absorb and dissipate part of the sound wave energy generated by the airflow, thereby reducing the propagation of noise during the rotation of the fan 100.

[0148] In some embodiments, the diameter of the through hole is D1, where 0.5mm < D1 < 2.5mm.

[0149] The diameter of the through hole should not be too large, otherwise the acoustic damping effect of the through hole will be weakened, resulting in poor noise reduction effect of the fan 100. However, the diameter of the through hole should not be too small, otherwise the sound waves will not be able to pass through the through hole. Therefore, the diameter range of 0.5mm to 2.5mm can both enhance the acoustic damping effect of the through hole and reduce the negative effects of excessive damping.

[0150] Specifically, the diameter of the through hole can be 2mm.

[0151] In some embodiments, the spacing between the centers of two adjacent through holes is H3, where 4 cm < H3 < 6 cm.

[0152] The appropriate center spacing H3 between adjacent through holes can effectively reduce the acoustic interference between the through holes, so that the through holes can independently play their acoustic damping role. If H3 is too small, the sound waves between adjacent through holes can superimpose or cancel each other, affecting the noise reduction effect. If H3 is too large, the uniformity of the overall acoustic damping can be reduced.

[0153] Therefore, by setting the center spacing H3 between two adjacent through holes in the range of 4 cm to 6 cm, the multiple through holes can obtain a more optimal noise reduction effect, and the noise generated by the fan 100 rotating is lower.

[0154] The embodiments of the present application also provide an air treatment device, which has the beneficial effects of the fan 100 in any of the above embodiments, and will not be described herein again.

[0155] The air treatment device can be any one of an air purifier, a humidifier, a dehumidifier, an air supply device, and a bladeless purification fan. The fan can be a component for driving airflow in the air purifier, the humidifier, the dehumidifier, the air supply device, and the bladeless purification fan, etc. The fan drives the airflow to flow, so that the airflow is treated by purification, humidification, dehumidification, etc.

[0156] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A fan, characterized by, Comprising: a first air guide member comprising a first air guide surface; a second air guide member comprising a second air guide surface, the first air guide surface and the second air guide surface being spaced apart; a plurality of blades connected between the first air guide surface and the second air guide surface; wherein the first air guide surface is formed as a curved surface convex or concave along a radial direction of the fan; and / or the second air guide surface is formed as a curved surface convex or concave along the radial direction of the fan.

2. The fan according to claim 1, wherein the first air guide member comprises a shaft mounting portion and a first air guide portion connected to a peripheral side of the shaft mounting portion, the first air guide portion comprising the first air guide surface, the first air guide portion being curvedly extended relative to an axial direction of the fan; the second air guide member is spaced apart from the first air guide member along the axial direction, the second air guide member comprising a suction portion for sucking air and a second air guide portion connected to a peripheral side of the suction portion, the second air guide portion comprising the second air guide surface, the second air guide portion being curvedly extended relative to the axial direction.

3. The fan according to claim 1, wherein in an axial cross section of the fan, a length L1 of a cross line of the first air guide surface is less than or equal to a length L2 of a cross line of the second air guide surface.

4. The fan according to claim 1, wherein in the axial cross section of the fan, the cross line of the first air guide surface and the cross line of the second air guide surface are both curved lines.

5. The fan according to claim 4, wherein the cross line of the first air guide surface comprises a first curved line; the cross line of the second air guide surface comprises a second curved line; a radius of curvature R1 of the first curved line is substantially equal to a radius of curvature R2 of the second curved line.

6. The fan according to claim 2, wherein in the axial cross section of the fan, a connection between the second air guide portion and the suction portion is formed with a first tangent line tangent to the second air guide surface, and an outer peripheral end of the second air guide portion is formed with a second tangent line tangent to the second air guide surface; the first tangent line forms a first included angle θ1 with an axis of the fan, and the second tangent line forms a second included angle θ2 with the axis, wherein θ1 > θ2.

7. The fan according to claim 6, wherein 10° < θ1 - θ2 < 20°.

8. The fan according to claim 2, wherein in the axial cross section of the fan, the connection between the second air guide portion and the suction portion is formed with a first tangent line tangent to the second air guide surface, and a connection between the first air guide portion and the shaft mounting portion is formed with a third tangent line tangent to the first air guide surface; the first tangent line forms a first included angle θ1 with an axis of the fan, and the third tangent line forms a third included angle θ3 with the axis, wherein θ3 ≥ θ1.

9. The fan according to claim 2, wherein in a radial direction of the fan, an air outlet end of the suction portion and the axis of the fan have a first spacing H1, and an outer peripheral end of the first air guide portion and the axis have a second spacing H2, wherein H1 < H2.

10. A fan, characterized by Comprising: The first air guide member includes a first air guide portion extending obliquely toward the radial outside of the fan; The second air guide member includes a second air guide portion extending obliquely toward the radial outside of the fan, and the first air guide portion and the second air guide portion are arranged at intervals; A plurality of blades are connected between the first air guide portion and the second air guide portion; The first air guide portion has an obliquely extending extension length L3, and the second air guide portion has an obliquely extending extension length L4, and L3≤L4.

11. The fan according to claim 10, wherein The first air guide member includes a shaft mounting portion, and the first air guide portion is connected to the peripheral side of the shaft mounting portion; The second air guide member includes an air suction portion for sucking air, and the second air guide portion is connected to the peripheral side of the air suction portion.

12. The fan according to claim 10, wherein In an axial cross section of the fan, the first air guide portion and the second air guide portion each extend along a straight line; or In an axial cross section of the fan, one of the first air guide portion and the second air guide portion extends along a straight line, and the other extends along a curved line; or In an axial cross section of the fan, the first air guide portion and the second air guide portion each extend along a curved line.

13. The fan according to claim 11, wherein In the radial direction of the fan, the air outlet end of the air suction portion and the axis of the fan have a first interval H1, and the outer peripheral end of the first air guide portion and the axis have a second interval H2, and H1 14. The fan according to claim 10, wherein The inclination angle θ4 of the first air guide portion is greater than or equal to the inclination angle θ5 of the second air guide portion, and the inclination angles are the included angles between the first air guide portion or the second air guide portion and the axis of the fan. including:

15. A fan, comprising: The first air guide member includes a first air guide portion; The second air guide member includes a second air guide portion, and the first air guide portion and the second air guide portion are arranged at intervals; A plurality of blades are connected between the first air guide portion and the second air guide portion; In the radial direction of the fan, the end of the second air guide portion close to the upstream side of the fan and the axis of the fan have a first interval H1, and the outer peripheral end of the first air guide portion and the axis have a second interval H2, and H1 16. The fan according to claim 15, wherein The first air guide member includes a shaft mounting portion, and the first air guide portion is connected to the peripheral side of the shaft mounting portion; The second air guide member includes an air suction portion for sucking air, and the second air guide portion is connected to the peripheral side of the air suction portion.

17. The fan according to claim 15, wherein In an axial cross section of the fan, the first air guide portion and the second air guide portion each extend along a straight line; or In an axial cross section of the fan, one of the first air guide portion and the second air guide portion extends along a straight line, and the other extends along a curved line; or In an axial cross section of the fan, the first air guide portion and the second air guide portion each extend along a curved line. ​ ​ 18. The fan according to claim 15, wherein in an axial cross section of the fan, the first air guide portion extends by a length L3 and the second air guide portion extends by a length L4, wherein L3≤L4.

19. The fan according to claim 15, wherein an inclination angle θ4 of the first air guide portion is greater than or equal to an inclination angle θ5 of the second air guide portion, the inclination angles being angles between the first air guide portion or the second air guide portion and an axis of the fan.

20. The fan according to any one of claims 2, 6 to 19, wherein in an axial cross section of the fan, a first connecting line is formed between an end of the second air guide portion close to an upstream side of the fan and an outer peripheral end of the first air guide portion, the first connecting line intersecting the axis of the fan.

21. A fan, comprising: including: a first air guide member including a first air guide portion; a second air guide member including a second air guide portion, the first air guide portion and the second air guide portion being spaced apart; a plurality of blades connected between the first air guide portion and the second air guide portion; an inclination angle θ4 of the first air guide portion is greater than or equal to an inclination angle θ5 of the second air guide portion, the inclination angles being angles between the first air guide portion or the second air guide portion and an axis of the fan.

22. An air treatment device, characterised in that, including: the fan according to any one of claims 1 to 21.

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