Fan and air treatment device

Abstract

A fan includes: a first air guide member including a first air guide surface; a second air guide member including a second air guide surface, where the first air guide surface is spaced apart from the second air guide surface; and a plurality of blades connected between the first air guide surface and the second air guide surface. The first air guide surface is configured as a curved surface that protrudes outward or recesses inward along a radial direction of the fan, and / or the second air guide surface is configured as a curved surface that protrudes outward or recesses inward along the radial direction of the fan.

Description

CROSS REFERENCE TO THE RELATED APPLICATIONS

[0001] This application is based upon and claims priority to Chinese Patent Application No. 202520172820.2, filed on January 25, 2025, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of household appliances, and in particular, to a fan and an air treatment device.BACKGROUND

[0003] In the related art, it is difficult for an air treatment device to form stable upward airflow when the fan sucks air. This impairs the air supply performance of the fan, thereby reducing the air treatment efficiency of the air treatment device.SUMMARY

[0004] Embodiments of the present disclosure provide a fan, which can stably suck air to improve the air supply efficiency of the fan, thereby enhancing the purification efficiency of the air treatment device.

[0005] An embodiment in a first aspect of the present disclosure provides a fan, including: a first air guide member including a first air guide surface; a second air guide member including a second air guide surface, where the first air guide surface is spaced apart from the second air guide surface; and a plurality of blades connected between the first air guide surface and the second air guide surface. The first air guide surface is configured as a curved surface that protrudes outward or recesses inward along a radial direction of the fan, and / or the second air guide surface is configured as a curved surface that protrudes outward or recesses inward along the radial direction of the fan.

[0006] In a possible implementation of the first aspect, the first air guide member includes a rotary shaft mounting portion and a first air guide portion connected to a peripheral side of the rotary shaft mounting portion; the first air guide portion includes the first air guide surface; the first air guide portion bends and extends 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 includes a suction portion configured to suck air and a second air guide portion connected to a peripheral side of the suction portion; the second air guide portion includes the second air guide surface; and the second air guide portion bends and extends relative to the axial direction.

[0007] In a possible implementation of the first aspect, in an axial cross-section of the fan, a length L1 of a section line of the first air guide surface is less than or equal to a length L2 of a section line of the second air guide surface.

[0008] In a possible implementation of the first aspect, in an axial cross-section of the fan, a section line of the first air guide surface and a section line of the second air guide surface are curved lines.

[0009] In a possible implementation of the first aspect, the section line of the first air guide surface includes a first curved line; the section line of the second air guide surface includes a second curved line; and a radius of curvature R1 of the first curved line is substantially the same as a radius of curvature R2 of the second curved line.

[0010] In a possible implementation of the first aspect, in an axial cross-section of the fan, a junction between the second air guide portion and the suction portion is provided with a first tangent line tangent to the second air guide surface, and an outer peripheral end of the second air guide portion is provided with a second tangent line tangent to the second air guide surface; and

[0011] a first included angle θ1 is formed between the first tangent line and an axis of the fan, and a second included angle θ2 is formed between the second tangent line and the axis, where θ1>θ2.

[0012] In a possible implementation of the first aspect, 10°<θ1-θ2< 20°.

[0013] In a possible implementation of the first aspect, in an axial cross-section of the fan, a junction between the second air guide portion and the suction portion is provided with a first tangent line tangent to the second air guide surface, and a junction between the first air guide portion and the rotary shaft mounting portion is provided with a third tangent line tangent to the first air guide surface; and

[0014] a first included angle θ1 is formed between the first tangent line and an axis of the fan, and an included angle θ3 is formed between the third tangent line and the axis, where θ3≥θ1.

[0015] In a possible implementation of the first aspect, along the radial direction of the fan, a first spacing H1 is formed between an air outlet end of the suction portion and an axis of the fan, and a second spacing H2 is formed between an outer peripheral end of the first air guide portion and the axis, where H1< H2.

[0016] An embodiment in a second aspect of the present disclosure provides a fan, including: a first air guide member including a first air guide portion extending obliquely outward along a radial direction of the fan; a second air guide member including a second air guide portion extending obliquely outward along the radial direction of the fan, where the first air guide portion is spaced apart from the second air guide portion; and a plurality of blades connected between the first air guide portion and the second air guide portion. The first air guide portion has an obliquely extended length of L3, and the second air guide portion has an obliquely extended length of L4, where L3≤ L4.

[0017] In a possible implementation of the second aspect, the first air guide member includes a rotary shaft mounting portion, and the first air guide portion is connected to a peripheral side of the rotary shaft mounting portion; and

[0018] the second air guide member includes a suction portion configured to suck air, and the second air guide portion is connected to a peripheral side of the suction portion.

[0019] In a possible implementation of the second aspect, in an axial cross-section of the fan, the first air guide portion and the second air guide portion extend along straight lines, respectively; or,

[0020] in the axial cross-section of the fan, one of the first air guide portion and the second air guide portion extends along a straight line, while the other of the first air guide portion and the second air guide portion extends along a curved line; or,

[0021] in the axial cross-section of the fan, the first air guide portion and the second air guide portion extend along curved lines, respectively.

[0022] In a possible implementation of the second aspect, along the radial direction of the fan, a first spacing H1 is formed between an air outlet end of the suction portion and an axis of the fan, and a second spacing H2 is formed between an outer peripheral end of the first air guide portion and the axis, where H1< H2.

[0023] In a possible implementation of the second aspect, 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, where the inclination angle is an included angle between the first air guide portion or the second air guide portion and the axis of the fan.

[0024] A third aspect of the present disclosure provides a fan, including: a first air guide member including a first air guide portion; a second air guide member including a second air guide portion, where the first air guide portion is spaced apart from the second air guide portion; and a plurality of blades connected between the first air guide portion and the second air guide portion. Along a radial direction of the fan, a first spacing H1 is formed between an end of the second air guide portion adjacent to an upstream side of the fan and an axis of the fan, and a second spacing H2 is formed between an outer peripheral end of the first air guide portion and the axis, where H1< H2.

[0025] In a possible implementation of the third aspect, the first air guide member includes a shaft mounting portion, and the first air guide portion is connected to a peripheral side of the shaft mounting portion; and

[0026] the second air guide member includes a suction portion configured to suck air, and the second air guide portion is connected to a peripheral side of the suction portion.

[0027] In a possible implementation of the third aspect, in an axial cross-section of the fan, the first air guide portion and the second air guide portion extend along straight lines, respectively; or,

[0028] in the axial cross-section of the fan, one of the first air guide portion and the second air guide portion extends along a straight line, while the other of the first air guide portion and the second air guide portion extends along a curved line; or,

[0029] in the axial cross-section of the fan, the first air guide portion and the second air guide portion extend along curved lines, respectively.

[0030] In a possible implementation of the third aspect, in an axial cross-section of the fan, the first air guide portion has an extended length of L3, and the second air guide portion has an extended length of L4, L3≤ L4.

[0031] In a possible implementation of the third aspect, 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, where the inclination angle is an included angle between the first air guide portion or the second air guide portion and the axis of the fan.

[0032] In a possible implementation of the third aspect, in an axial cross-section of the fan, a first connecting line is formed between an end of the second air guide portion adjacent to an upstream side of the fan and an outer peripheral end of the first air guide portion, and the first connecting line intersects with an axis of the fan.

[0033] A fourth aspect of the present disclosure provides a fan, including: a first air guide member including a first air guide portion; a second air guide member including a second air guide portion, where the first air guide portion is spaced apart from the second air guide portion; and 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, where the inclination angle is an included angle between the first air guide portion or the second air guide portion and an axis of the fan.

[0034] A fifth aspect of the present disclosure provides an air treatment device, including the fan provided by any of the above aspects.

[0035] Compared with the prior art, the present disclosure has the following beneficial effects:

[0036] According to the fan provided by the embodiments of the present disclosure, at least one of the first air guide surface and the second air guide surface that are connected to the blades is configured as a curved surface. Since the airflow is more likely to form the Coanda effect on the curved surface, vortices and turbulence in the air outlet duct can be reduced, and the airflow can be sucked into and discharged from the fan more stably, thereby improving air supply performance of the fan.

[0037] Additional aspects and advantages of the present disclosure will be partly provided in the following description, and partly become evident in the following description or understood through the practice of the present disclosure.BRIEF DESCRIPTION OF THE DRAWINGS

[0038] To describe the technical solutions in the embodiments of the present disclosure more clearly, the drawings required for describing the embodiments are briefly described below. Apparently, the drawings in the following description show merely some embodiments of the present disclosure, and those of ordinary skill in the art may still derive other drawings from these drawings without creative efforts.

[0039] FIG. 1 is a first cross-sectional view of a fan according to an embodiment of the present disclosure;

[0040] FIG. 2 is a second cross-sectional view of a fan according to an embodiment of the present disclosure;

[0041] FIG. 3 is a third cross-sectional view of a fan according to an embodiment of the present disclosure;

[0042] FIG. 4 is a fourth cross-sectional view of a fan according to an embodiment of the present disclosure; and

[0043] FIG. 5 is a schematic partial view of a blade in a fan according to an embodiment of the present disclosure.Reference numerals

[0044] 100-fan;

[0045] 10-first air guide member, 101-first air guide portion, 1011-first air guide surface, 1012-first curved line, and 102-rotary shaft mounting portion;

[0046] 20-second air guide member, 201-second air guide portion, 2011-second air guide surface, 2012-second curved line, 202-suction portion, and 2021-air outlet end;

[0047] A-air outlet duct;

[0048] 30-blade, 301-root, 302-tip, 303-leading edge, and 304-trailing edge;

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

[0050] 50-inner shell; and

[0051] 60-driving member, and 601-drive shaft.DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] The technical solutions in the embodiments of the present disclosure are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely some rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0053] In the present disclosure, orientations or positional relationships indicated by terms such as ''upper'', ''lower'', ''left'', ''right'', ''front'', ''rear'', ''top'', ''bottom'', ''inside'', ''outside'', ''vertical'', ''horizontal'', ''transverse'', ''longitudinal'' are all based on what are illustrated in the drawings. These terms are mainly intended to better describe the present disclosure and embodiments thereof, rather than to define that the devices, elements or components indicated must have the specific orientation or be constructed and operated in the specific orientation.

[0054] Besides, some of the terms mentioned above may be used to indicate other meanings in addition to indicating the orientations or positional relations. For example, the term "upper" may also be used to indicate an attachment relationship or a connection relationship in some cases. Those of ordinary skill in the art may understand specific meanings of these terms in the present disclosure based on a specific situation.

[0055] In addition, the meanings of the terms ''mount'', ''dispose'', ''provide'', and ''connect'' should be understood in a broad sense. For example, ''connection'' may be a fixed connection, a removable connection, or integration; may be a mechanical connection or an electrical connection; may be a direct connection or an indirect connection implemented by using an intermediate medium; or may be intercommunication between two components, elements or components. Those of ordinary skill in the art may understand specific meanings of the foregoing terms in the present disclosure based on a specific situation.

[0056] In addition, terms such as ''first'' and ''second'' are primarily used to distinguish different devices, elements or components (the specific types and structures may be the same or different) and are not intended to indicate or imply the relative importance or quantity of the devices, elements and components referred to. In the description of the present disclosure, unless otherwise specified, "a plurality of" means two or more.

[0057] Referring to FIGS. 1-4, an embodiment of the present disclosure provides the fan 100. The fan 100 includes the first air guide member 10, the second air guide member 20, and the blade 30 connected to the first air guide member 10 and the second air guide member 20. The first air guide member 10 is configured to connect the driving member 60. The driving member 60 is configured to drive the first air guide member 10 to rotate, thereby driving the entire fan 100 to rotate, and driving air around the fan 100 to flow.

[0058] The first air guide member 10 includes the first air guide surface 1011. The second air guide member includes the second air guide surface 2011. The second air guide surface 2011 is spaced apart from the first air guide surface 1011 along an axial direction of the fan 100. In this embodiment of the present disclosure, a space between the first air guide surface 1011 and the second air guide surface 2011 is called the air outlet duct A.

[0059] The blade 30 is connected between the first air guide surface 1011 and the second air guide portion 201. A plurality of blades 30 are disposed at intervals along a circumferential direction of the fan 100. Understandably, that the blade 30 is connected between the first air guide surface 1011 and the second air guide portion 201 refers to some or all blades 30 in the plurality of blades 30 are connected between the first air guide surface 1011 and the second air guide portion 201. When the fan 100 rotates, the blade 30 pressurizes and propels the airflow upward and outward, thereby accelerating a pressure and a flow velocity of the airflow, and enabling the airflow to flow out rapidly and achieve a relatively high head.

[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 are curved surfaces. Or, the first air guide surface 1011 is a curved surface, while a shape of the second air guide surface 2011 is not limited in this embodiment of the present disclosure. Or the second air guide surface 2011 is a curved surface, while a shape of the first air guide surface 1011 is not limited in this embodiment of the present disclosure.

[0061] In some embodiments, the first air guide surface 1011 is a curved surface that protrudes outward along a radial direction of the fan 100, and the second air guide surface 2011 is a curved surface that recesses inward along the radial direction of the fan 100.

[0062] In some embodiments, the first air guide surface 1011 is a curved surface that recesses inward along a radial direction of the fan 100, and the second air guide surface 2011 is a curved surface that protrudes outward along the radial direction of the fan 100.

[0063] Understandably, in addition to the blade 30 configured to propel the airflow, the first air guide surface 1011 is configured to guide the airflow. When the first air guide surface 1011 is configured as the curved surface, the airflow is more likely to form the Coanda effect on the first air guide surface 1011. The Coanda effect refers to the phenomenon that a fluid tends to flow along the curved surface when passing over it. When the airflow flows along the curved first air guide surface 1011, the airflow is likely to form the Coanda effect, and flow along the curved surface of the first air guide surface 1011, such that the first air guide surface 1011 can guide the airflow more effectively, improving the aerodynamic efficiency of the fan 100. Furthermore, this further reduces separation of the airflow on the first air guide surface 1011, i.e., reduces the vortices and turbulence, thereby lowering aerodynamic noise.

[0064] In addition, the second air guide surface 2011 is also configured to guide the airflow. When the airflow flows along the curved second air guide surface 2011, the airflow is likely to form the Coanda effect, and flows along the curved surface of the second air guide surface 2011, such that the second air guide surface 2011 can guide the airflow more effectively, improving the aerodynamic efficiency of the fan 100. Furthermore, this further reduces separation of the airflow on the second air guide surface 2011, i.e., reduces the vortices and turbulence, thereby lowering aerodynamic noise.

[0065] Therefore, according to the fan 100 provided by the embodiment of the present disclosure, at least one of the first air guide surface 1011 and the second air guide surface 2011 that are connected to the blade 30 is configured as a curved surface. Since the airflow is more likely to form the Coanda effect on the curved surface, vortices and turbulence in the air outlet duct can be reduced, and the airflow can be sucked into and discharged from the fan 100 more stably, thereby improving air supply performance of the fan 100.

[0066] In some embodiments, as shown in FIG. 1, the fan 100 includes the outer shell 40. A top of the outer shell 40 is typically provided with the air outlet 401, so as to facilitate top air supply of the fan 100. Both the first air guide member 10 and the second air guide member 20 are disposed in the outer shell 40. Along the axial direction of the fan 100, the second air guide member 20 is farther away from the air outlet 401 than the first air guide member 10. A mounting opening for the second air guide member 20 is formed in a bottom of the outer shell 40. The mounting opening for the second air guide member 20 is also configured for air intake.

[0067] In some embodiments, as shown in FIG. 1, the fan 100 includes the inner shell 50. The inner shell 50 is connected to the outer shell 40, and configured to mount the driving member 60. A part of a region between the inner shell 50 and the outer shell 40 forms the air supply duct B. The air supply duct B communicates with the air outlet 401. The air outlet duct A communicates with the air supply duct B.

[0068] In some embodiments, as shown in FIG. 2, the first air guide member 10 includes the rotary shaft mounting portion 102. The rotary shaft mounting portion 102 includes a mounting shaft hole. The mounting shaft hole is configured to connect the drive shaft 601 of the driving member 60. Since the fan 100 is connected to the driving member 60, the fan 100 has the axial direction and the radial direction. The axial direction of the fan 100 is an extension direction for an axis of the rotary shaft mounting portion 102 / the mounting shaft hole, while the radial direction is a direction perpendicular or substantially perpendicular to the axial direction.

[0069] Understandably, to enhance the stable mounting and efficient driving connection between the fan 100 and the driving member 60, the rotary shaft mounting portion 102 is configured as a radially extending structure.

[0070] As shown in FIG. 2, the first air guide member 10 includes the first air guide portion 101. The first air guide portion 101 is configured as an annular structure. The first air guide portion 101 is connected to a peripheral side of the rotary shaft mounting portion 102, i.e., the first air guide portion 101 surrounds an outer periphery of the rotary shaft mounting portion 102.

[0071] As shown in FIG. 2, the second air guide member 20 includes the suction portion 202. The suction portion 202 includes a suction port. The suction port is configured to suck the airflow around the fan 100.

[0072] As shown in FIG. 2, the second air guide member 20 includes the second air guide portion 201. The second air guide portion 201 is configured as an annular structure. The second air guide portion 201 is connected to a peripheral side of the suction portion 202, i.e., the second air guide portion 201 surrounds an outer periphery of the suction portion 202.

[0073] For ease of description, as shown in FIG. 2, in this embodiment of the present disclosure, a space between the first air guide portion 101 and the second air guide portion 201 is called the air outlet duct A.

[0074] In some embodiments, while extending outward along the radial direction from a junction with the rotary shaft mounting portion 102, the first air guide portion 101 extends away from the second air guide member 20. While extending along the above direction, the first air guide portion 101 further bends and extends to form a bent structure relative to the axial direction of the fan 100. The first air guide portion 101 functions to guide the airflow to flow upward.

[0075] As shown in FIG. 2, the first air guide portion 101 includes the first air guide surface 1011 connected to the blade 30. Since the first air guide portion 101 bends and extends, the first air guide surface 1011 is configured as the curved surface that protrudes outward or recesses inward along the radial direction.

[0076] In some embodiments, as shown in FIG. 2, while extending outward along the radial direction from a junction with the suction portion 202, the second air guide portion 201 extends adjacent to the first air guide member 10. While extending along the above direction, the second air guide portion 201 further bends and extends to form a bent structure relative to the axial direction of the fan 100. The second air guide portion 201 functions to guide the airflow to flow upward.

[0077] As shown in FIG. 2, the second air guide portion 201 includes the second air guide surface 2011 connected to the blade 30. Since the second air guide portion 201 bends and extends, the second air guide surface 2011 is configured as the curved surface that protrudes outward along the radial direction.

[0078] In some embodiments, the first air guide portion 101 and the second air guide portion 201 each have a curvilinear extending structure.

[0079] In some embodiments, the first air guide portion 101 has a curvilinear extending structure, while the second air guide portion 201 has other structural forms. For example, the second air guide portion 201 has a linear extending structure.

[0080] In some embodiments, the second air guide portion 201 has a curvilinear extending structure, and the first air guide portion 101 has other structural forms. For example, the first air guide portion 101 has a linear extending structure.

[0081] Understandably, as long as at least one of the first air guide portion 101 and the second air guide portion 201 has the curvilinear extending structure, i.e., at least one of the first air guide surface 1011 and the second air guide surface 2011 is configured as the curved surface, the airflow sucked from the suction portion 202 can form the Coanda effect along the curved air guide surface, and can be desirably guided. The air can be sucked from the suction portion 202 and discharged from the air outlet duct more stably, reducing 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 is to be noted that due to a centrifugal force of the fan 100 during rotation, the airflow through the second air guide surface 2011 has a greater flow rate. Furthermore, since the second air guide surface 2011 is closer to the suction portion 202, the second air guide surface 2011 configured as the curved surface can further enhance stability of the airflow flowing along the curved surface, and can reduce backflow of the air on the suction portion 202, thereby improving the air suction efficiency of the fan 100. A stable pressure difference can be maintained between two axial sides of the fan 100, thereby enhancing the overall performance and ventilation effect of the fan 100.

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

[0084] In some embodiments, since the first air guide surface 1011 is the curved surface, the first air guide surface 1011 has a section line in the axial cross-section of the fan 100. The section line is understood as a contour line formed by the first air guide surface 1011 in the axial cross-section. The section line of the first air guide surface 1011 has a length of L1.

[0085] In some embodiments, since the second air guide surface 2011 is the curved surface, the second air guide surface 2011 has a section line in the axial cross-section of the fan 100. The section line is understood as a contour line formed by the second air guide surface 2011 in the axial cross-section. The section line of the second air guide surface 2011 has a length of L2, L1≤ L2.

[0086] The length L2 of the section line formed by the second air guide surface 2011 is greater than the length L1 of the section line formed by the first air guide surface 1011, such that the second air guide surface 2011 can further guide the airflow toward the first air guide member 10 along the sufficiently long second air guide surface 2011, i.e., guide the airflow upward, to reduce contact between the airflow flowing out from the fan 100 and the outer shell 40 of the fan 100, thereby minimizing the noise.

[0087] Further, since the second air guide surface 2011 is closer to the suction portion 202, the greater length L2 of the section line formed by the second air guide surface 2011 can further increase a flowing length of the airflow along the second air guide surface 2011, such that a stable flowing path of the airflow is longer to reduce the backflow of the airflow from the suction portion 202. The stable pressure difference can be maintained between the two axial sides of the fan 100, thereby enhancing the stability of the airflow.

[0088] It is to be noted that due to the centrifugal force of the fan 100 during rotation, a flow rate of airflow contacting the second air guide surface 2011 is greater than a flow rate of airflow contacting the first air guide surface 1011. With the greater length L2 of the second curved line 2012 than the length L1 of the first curved line 1012, the guiding effect of the fan 100 for the airflow can further be improved.

[0089] In some embodiments, as shown in FIG. 2, in the axial cross-section of the fan 100, the section line of the first air guide surface 1011 includes the first curved line 1012, and the section line of the second air guide surface 2011 includes the second curved line 2012.

[0090] The first curved line 1012 has the radius of curvature R1, and the second curved line 2012 has the radius of curvature R2. The R1 is substantially the same as the R2. That the R1 is substantially the same as the R2 means that the R1 is the same as the R2, or the R1 is approximately the same as the R2.

[0091] Since the radius of curvature R1 of the first curved line 1012 is substantially the same as the radius of curvature R2 of the second curved line 2012, a spacing between the first air guide portion 101 and the second air guide portion 201 is uniform. The airflow can be more stable to flow through the air outlet duct A, reducing turbulence possibly caused by a significant difference in the width of the air outlet duct A, thereby increasing the flow rate of the airflow to pass through the fan 100 and improving the overall aerodynamic efficiency of the fan 100.

[0092] In some embodiments, as shown in FIG. 3, in an axial cross-section of the fan 100, the first tangent line La tangent to the second air guide surface 2011 is formed. The first tangent line La passes through a junction point between the suction portion 202 and the second air guide portion 201. In the axial cross-section, the second tangent line Lb tangent to the second air guide surface 2011 is further formed. The second tangent line Lb passes through an outer end of the second air guide portion 201, i.e., the second tangent line Lb passes through a free end or an air outlet end of the second air guide portion 201.

[0093] The first included angle θ1 is formed between the first tangent line La and the axis o-o of the fan 100, and the second included angle θ2 is formed between the second tangent line Lb and the axis o-o of the fan 100, θ1>θ2. In this way, the second air guide surface 2011 tends to extend upward. Meanwhile, the outer peripheral end of the second air guide surface 2011 tends to deflect toward the axis o-o of the fan 100. That is, the second air guide surface 2011 tends to extend toward the air outlet 401 on the top of the fan 100, and the airflow is deflected to some extent when flowing along the second air guide surface 2011.

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

[0095] It is to be noted that due to the centrifugal force of the fan 100 during rotation, a flow rate and a flow velocity of airflow contacting the second air guide surface 2011 are greater than a flow rate and a flow velocity of airflow contacting the first air guide surface 1011. This can be understood as that compared with the first air guide surface 1011, the flow guiding effect of the second air guide surface 2011 is more pronounced. Therefore, the extension direction of the second air guide surface 2011 is defined as above, so as to achieve a more obvious guiding effect for the airflow toward the air outlet 401.

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

[0097] In this way, the curvature of the second air guide surface 2011 can change within a moderately small range, such that when the airflow flows along the second air guide surface 2011, its flow direction changes gently, thereby reducing air pockets that are easily caused by excessive changes in the flow direction of the airflow. Such air pockets would reduce the air output of the fan 100.

[0098] Exemplarily, a difference between the first included angle θ1 and the second included angle θ2 is 10°, 13°, 15°, 17°, or 20°.

[0099] In some embodiments, as shown in FIG. 3, in an axial cross-section of the fan 100, the third tangent line Lc tangent to the first air guide surface 1011 is formed. The third tangent line Lc passes through a junction point between the rotary shaft mounting portion 102 and the first air guide portion 101.

[0100] The third included angle θ3 is formed between the third tangent line Lc and the axis o-o of the fan 100, θ3≥θ1.

[0101] Understandably, since the second air guide surface 2011 is closer to the suction portion 202, and θ3≥θ1, such that the bending angle formed at a junction between the second air guide surface 2011 and the suction portion 202 relatively small, reducing the energy loss caused by abrupt direction change of the air sucked into the air outlet duct A. Meanwhile, the air outlet duct A between the first air guide surface 1011 and the second air guide surface 2011 is also gradually narrowed from an air inlet side to an air outlet side, i.e., the airflow therein is gradually compressed, such that the stable pressure difference is formed between the two axial sides of the fan 100, thereby enhancing the air supply efficiency and overall performance of the fan 100.

[0102] Further, to limit the extent of narrowing of the air outlet duct A, a difference between the third included angle and the first included angle is further limited. Exemplarily, 0°<θ3 - θ1< 5°.

[0103] The present disclosure provides the fan 100. As shown in FIG. 4, the fan 100 includes the first air guide member 10, the second air guide member 20, and a plurality of blades 30. The first air guide member 10 includes the first air guide portion 101. The second air guide member 20 includes the second air guide portion 201.

[0104] In this embodiment, the first air guide portion 101 in the fan 100 obliquely extends outward along a radial direction of the fan 100, and the second air guide portion 201 obliquely extends outward along the radial direction of the fan.

[0105] Specifically, while extending outward along the radial direction, the second air guide portion 201 further inclines relative to an axial direction of the fan 100. A specific inclination and extension direction is to gradually move away from the suction portion 202 of the fan 100, i.e., to incline upward. While extending outward along the radial direction of the fan 100, the second air guide portion 201 further inclines relative to the axial direction of the fan 100. A specific inclination and extension direction is to gradually move adjacent to the air outlet 401 of the fan 100, i.e., to incline upward.

[0106] The first air guide portion 101 has an obliquely extended length of L3, and the second air guide portion 201 has an obliquely extended length of L4, L3≤ L4.

[0107] It is to be noted that inclination and extension of the first air guide portion 101 and the second air guide portion 201 refer to directions for extension tendencies of the first air guide portion 101 and the second air guide portion 201, and do not limit specific shapes of the first air guide portion 101 and the second air guide portion 201.

[0108] It is to be noted that due to a centrifugal force of the fan 100 during rotation, a flow rate and a flow velocity of airflow contacting the second air guide portion 201 are greater than a flow rate and a flow velocity of airflow contacting the first air guide portion 101. When the airflow flows through a surface of an object, it needs to overcome friction. Since the flow velocity of the airflow contacting the first air guide portion 101 is less than the flow velocity of the airflow contacting the second air guide surface 2011, the capability of the airflow for overcoming the friction is relatively weak, and the airflow is more prone to form a plurality of tiny vortices on the first air guide portion 101. These vortices cause backflow outside the suction portion 202 and reduce the overall flow velocity of the airflow.

[0109] In this embodiment, with the smaller extended length L3 of the first air guide portion 101, a contact area between the airflow and the first air guide portion 101 can be reduced, thereby reducing vortices. Therefore, the airflow can flow out of the air outlet duct A more smoothly, and the air output of the fan 100 is further enhanced.

[0110] In addition, the obliquely extended length L4 of the second air guide portion 201 in this embodiment is greater, such that the second air guide member 20 can further guide the airflow toward the air outlet 401 along the sufficiently long second air guide surface 2011, and a stable pressure difference is formed between two axial sides of the fan 100, thereby enhancing the air supply efficiency of the fan 100.

[0111] A linear velocity of the airflow flowing through the surface of the object is expressed as: v = ωr, where v denotes the linear velocity, ω denotes an angular velocity, and r denotes a distance from the object to a center of rotation.

[0112] The fan 100 generates the angular velocity during rotation. With the greater extended length of the second air guide portion 201, an outer peripheral end of the second air guide portion 201 is farther from axis o-o of the fan 100 than an outer peripheral end of the first air guide portion 101, i.e., the linear velocity of the airflow at the outer peripheral end of the second air guide portion 201 is significantly greater than the linear velocity of the airflow at the outer peripheral end of the first air guide portion 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 portion 201 are higher, thereby improving the overall air supply efficiency of the fan 100.

[0113] In some embodiments, in an axial cross-section of the fan 100, the first air guide portion 101 and the second air guide portion 201 extend along straight lines, respectively.

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

[0115] In some embodiments, in the axial cross-section of the fan 100, the first air guide portion 101 and the second air guide portion 201 extend along curved surfaces, respectively.

[0116] The technical effect on the solution in which the first air guide portion 101 and / or the second air guide portion 201 extend along the curved line will not be repeated herein.

[0117] In some embodiments, an inclination angle θ4 of the first air guide portion 101 is greater than or equal to an inclination angle θ5 of the second air guide portion 201. The inclination angle is an included angle between the first air guide portion 101 or the second air guide portion 201 and the axis of the fan 100. The technical effect on the solution in which the inclination angle θ4 of the first air guide portion 101 is greater than or equal to the inclination angle θ5 of the second air guide portion 201 refers to the technical effect on θ3>θ1 in FIG. 3 of the above embodiment, and will not be repeated herein.

[0118] Understandably, in the axial cross-section of the fan 100, when the first air guide portion 101 or the second air guide portion 201 is configured as an obliquely extended straight line, the inclination angle refers to an included angle between any position of the first air guide portion 101 or the second air guide portion 201 and the axis o-o of the fan 100. In the axial cross-section of the fan 100, when the first air guide portion 101 or the second air guide portion 201 is configured as an obliquely extended curved line, the inclination angle refers to an included angle between any end portion (with reference to the above embodiment of the present disclosure and the embodiment corresponding to FIG. 3) or a tangent line of any position of the first air guide portion 101 or the second air guide portion 201 and the axis o-o of the fan 100.

[0119] An embodiment of the present disclosure provides the fan 100. As shown in FIG. 4, it includes the first air guide member 10, the second air guide member 20, and a plurality of blades 30. The first air guide member 10 includes the first air guide portion 101. The second air guide member 20 includes the second air guide portion 201.

[0120] In the embodiment, shapes of the first air guide portion 101 and the second air guide portion 201 are not specifically limited by the fan 100. The first air guide portion 101 and the second air guide portion 201 obliquely extend along a straight line, and also bend and extend.

[0121] Along a radial direction of the fan 100, the first spacing H1 is formed between an end of the second air guide portion 201 adjacent to an upstream side of the fan 100 and axis o-o of the fan 100, and the second spacing H2 is formed between an outer peripheral end of the first air guide portion 101 and the axis o-o, H1< H2.

[0122] The end of the second air guide portion 201 adjacent to the upstream side of the fan 100 is an end of the second air guide portion 201 relatively adjacent to an air suction side. Understandably, the upstream side and the downstream side are associated with an air flowing direction, and the air typically flows from the upstream side to the downstream side.

[0123] Specifically, since the second air guide portion 201 is connected to the suction portion 202, the end of the second air guide portion 201 adjacent to the upstream side of the fan 100 is the air outlet end 2021 of the suction portion 202.

[0124] The suction portion 202 is configured as a hollow cylindrical structure. The air outlet end 2021 of the suction portion 202 is an end adjacent to the first air guide member 10. The air outlet end 2021 of the suction portion 202 is connected to the second air guide portion 201.

[0125] H1< H2, i.e., the air outlet end 2021 of the suction portion 202 and an outer peripheral end of the first air guide portion 101 are displaced along the radial direction of the fan 100, and the outer peripheral end of the first air guide portion 101 is farther from the axis o-o.

[0126] It is to be noted that after the airflow flows into the air outlet duct A from the suction portion 202, a part of the airflow will flow out of the air outlet duct A along the outer peripheral end of the first air guide portion 101. Since the air outlet end 2021 of the suction portion 202 and the outer peripheral end of the first air guide portion 101 are displaced in the radial direction of the fan 100, and the outer peripheral end of the first air guide portion 101 is farther from the axis o-o, the airflow can be reduced to directly flow out of the outer peripheral end of the first air guide portion 101 from the air outlet end 2021 of the suction portion 202, i.e., the airflow is reduced to directly pass through between the first air guide member 10 and the second air guide member 20 without being pushed and accelerated by the blades 30. Understandably, if the airflow directly flows out from the outer peripheral end of the first air guide portion 101 without being accelerated by the blades 30, the air supply efficiency of the fan 100 will be reduced.

[0127] By displacing the air outlet end 2021 of the suction portion 202 and the outer peripheral end of the first air guide portion 101 in the radial direction of the fan 100, after the airflow flows into the air outlet duct A, the airflow is deflected to some extent, reducing direct passage of the airflow. The airflow contacts the blades 30 more efficiently and is pushed and accelerated by the blades 30, such that a pressure difference between two sides of the fan 100 is relatively stable, enhancing the air suction capacity of the fan 100.

[0128] In the above embodiment, in an axial cross-section of the fan 100, as shown in FIG. 4, the first air guide portion 101 extends along a straight line, and the second air guide portion 201 extends along a straight line. Or, in the axial cross-section of the fan 100, one of the first air guide portion 101 and the second air guide portion 201 extends along a straight line, while the other of the first air guide portion 101 and the second air guide portion 201 extends along a curved line. Or, in the axial cross-section of the fan 100, the first air guide portion 101 and the second air guide portion 201 extend along curved lines, respectively.

[0129] In some implementations, in an axial cross-section of the fan 100, the first air guide portion 101 has an extended length of L3, and the second air guide portion 201 has an extended length of L4, where L3≤ L4. The technical effect on L3≤ L4 refers to the technical effect on L3≤ L4 in the above embodiment, and will not be repeated herein.

[0130] In some implementations, an inclination angle θ4 of the first air guide portion 101 is greater than or equal to an inclination angle θ5 of the second air guide portion 201. The inclination angle is an included angle between the first air guide portion 101 or the second air guide portion 201 and an axis of the fan 100. The technical effect on the solution in which the inclination angle θ4 of the first air guide portion 101 is greater than or equal to the inclination angle θ5 of the second air guide portion 201 refers to the technical effect on θ3>θ1 in FIG. 3 of the above embodiment, and will not be repeated herein.

[0131] Understandably, in the axial cross-section of the fan 100, when the first air guide portion 101 or the second air guide portion 201 is configured as an obliquely extended straight line, the inclination angle refers to an included angle between any position of the first air guide portion 101 or the second air guide portion 201 and the axis o-o of the fan 100. In the axial cross-section of the fan 100, when the first air guide portion 101 or the second air guide portion 201 is configured as an obliquely extended curved line, the inclination angle refers to an included angle between any end portion (with reference to the above embodiment of the present disclosure and the embodiment corresponding to FIG. 3) or a tangent line of any position of the first air guide portion 101 or the second air guide portion 201 and the axis o-o of the fan 100.

[0132] In any of the above embodiments of the present disclosure relating to the fan 100, as shown in FIG. 4, along the radial direction of the fan 100, the first spacing H1 is formed between the air outlet end 2021 of the suction portion 202 and the axis o-o of the fan 100, and the second spacing H2 is formed between the outer peripheral end of the first air guide portion 101 and the axis o-o, H1< H2. The beneficial effect refers to any of the above embodiments of the present disclosure relating to the fan 100, and will not be repeated herein.

[0133] An embodiment of the present disclosure provides the fan 100. As shown in FIG. 4, it includes the first air guide member 10, the second air guide member 20, and a plurality of blades 30. The first air guide member 10 includes the first air guide portion 101. The second air guide member 20 includes the second air guide portion 201.

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

[0135] Understandably, since the second air guide portion 201 is closer to a suction portion, and θ4>θ5, such that the bending angle formed at a junction between the second air guide surface 2011 and the suction portion 202 is relatively small, reducing the energy loss caused by abrupt direction change of the air sucked into air outlet duct A. Meanwhile, the air outlet duct A between the first air guide surface 1011 and the second air guide surface 2011 is gradually narrowed from an air inlet side to an air outlet side, i.e., the airflow therein is gradually compressed, such that a stable pressure difference is formed between two axial sides of the fan 100, thereby enhancing the air supply efficiency and overall performance of the fan 100.

[0136] Further, to limit the extent of narrowing of the air outlet duct A, a difference between the θ4 and the θ5 is further limited. Exemplarily, 0°<θ4 - θ5< 5°.

[0137] It is to be noted that the limiting relationship relating to that the inclination angle θ4 of the first air guide portion 101 is greater than or equal to the inclination angle θ5 of the second air guide portion 201 is also incorporated into the fan 100 provided in the above embodiment of the present disclosure, and the beneficial effect thereof will not be repeated herein.

[0138] In an embodiment that can be incorporated into any of the above embodiments, as shown in FIG. 5, the plurality of blades 30 each include the root 301 connected to the first air guide surface 1011 and the tip 302 connected to the second air guide surface 2011. A connection length between the root 301 and the first air guide surface 1011 is L5, and a connection length between the tip 302 and the second air guide surface 2011 is L6, L5> L6.

[0139] To enable the airflow between the blades 30 to flow upward more smoothly, with L5> L6, the airflow can obtain a greater thrust on the root 301 of the blade 30 when passing through the blade 30. This enhances the axial lift of the airflow, thereby improving the head and air supply efficiency of the fan 100.

[0140] In an embodiment that can be incorporated into any of the above embodiments, as shown in FIG. 5, the blade 30 includes the leading edge 303 configured to receive the airflow and the trailing edge 304 configured to discharge the airflow. The leading edge 303 extends along a straight line, and the trailing edge 304 extends along a curved line.

[0141] The leading edge 303 of the blade 30 extends along the straight line, which can improve the airflow cutting efficiency of the blade 30 on the airflow receiving side. The straight leading edge 303 can contact the airflow from the suction portion 202 more directly and effectively, improve the attachment efficiency of the airflow along the blade 30, and reduce the disturbance and energy loss of the airflow on the leading edge 303 of the blade 30.

[0142] The trailing edge 304 of the blade 30 extends along the curved line, which can optimize the flow velocity and direction of the airflow from the blade 30. During rotation of the fan 100, after the blade 30 propels the airflow, the airflow can flow out of the air outlet duct A more smoothly through the curved trailing edge 304, reducing the flow separation and vortices.

[0143] In this way, the configuration that the leading edge 303 of the blade 30 extends along the straight line, and the trailing edge 304 of the blade 30 extends along the curved line can improve the air supply uniformity and stability of the fan 100.

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

[0145] After the airflow flows into the air outlet duct A from the suction portion 202, a part of the airflow will flow out of the air outlet duct A along the outer peripheral end of the first air guide portion 101. The first connecting line Ld intersects with the axis o-o of the fan 100, such that the airflow entering the air outlet duct A from the suction portion 202 can be deflected, rather than axially and directly flowing out of the fan 100. As described above, if the airflow directly flows out from the outer peripheral end of the first air guide portion 101 without being accelerated by the blades 30, the air suction performance of the fan 100 will be reduced.

[0146] In an embodiment that can be incorporated into any of the above embodiments, a plurality of through holes are formed in the blade 30.

[0147] The plurality of through holes are formed in the blade 30. These through holes in the blades 30 are regarded as acoustic filters. When sound waves pass through the blade 30 provided with the plurality of through holes, the sound waves will undergo friction and collision with inner walls of the through holes, resulting in dissipation of sound energy. The through holes have a certain acoustic damping effect, which can absorb and dissipate a part of the sound energy generated by the airflow, thereby reducing propagation of noise during the rotation of the fan 100.

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

[0149] The diameter of the through hole should not be excessively large. Otherwise, the acoustic damping effect of the through hole is weakened, leading to poor noise reduction performance of the fan 100. However, the diameter of the through hole should not be excessively small either, since the excessively small diameter will prevent the sound waves from passing through the through hole. Therefore, the diameter in the range from 0.5 mm to 2.5 mm not only enhances the acoustic damping effect of the through hole, but also reduces the negative impact caused by excessive damping.

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

[0151] In some embodiments, a center distance between two adjacent through holes is H3, where 4 cm < H3< 6 cm.

[0152] The appropriate center distance H3 between adjacent through holes can effectively reduce acoustic interference between the through holes, enabling the through holes to exert their acoustic damping effect independently. If the H3 is too small, the sound waves between adjacent through holes are superimposed or counteracted with each other, affecting the noise reduction effect. If the H3 is too large, the uniformity of the overall acoustic damping is reduced.

[0153] In this way, by setting the center distance H3 between two adjacent through holes in the range of 4 cm to 6 cm, the plurality of through holes can achieve a better noise reduction effect, resulting in lower noise during the rotation of the fan 100.

[0154] An embodiment of the present disclosure further provides an air treatment device. The air treatment device possesses the beneficial effects of the fan 100 in any of the above embodiments, and will not be repeated herein.

[0155] The air treatment device is any one of an air purifier, a humidifier, a dehumidifier, an air supply device, and a bladeless purification fan. The fan is a component configured to drive airflow to flow in the air purifier, the humidifier, the dehumidifier, the air supply device, and the bladeless purification fan. The fan is configured to drive the airflow to flow, such that the airflow is purified, humidified, or dehumidified.

[0156] Finally, it should be noted that the above embodiments are merely used to explain the technical solutions of the present disclosure, but are not intended to limit the present disclosure. Although the present disclosure is described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions on some or all technical features therein. These modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. 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, wherein the first air guide surface is spaced apart from the second air guide surface; anda plurality of blades connected between the first air guide surface and the second air guide surface;wherein the first air guide surface is configured as a first curved surface and protrudes outward or recesses inward along a radial direction of the fan, and / or the second air guide surface is configured as a second curved surface and protrudes outward or recesses inward along the radial direction of the fan.

2. The fan according to claim 1, whereinthe first air guide member comprises a rotary shaft mounting portion and a first air guide portion connected to a peripheral side of the rotary shaft mounting portion; the first air guide portion comprises the first air guide surface; and the first air guide portion bends and extends relative to an axial direction of the fan; andthe second air guide member is spaced apart from the first air guide member along the axial direction; the second air guide member comprises a suction portion configured to suck air and a second air guide portion connected to a peripheral side of the suction portion; the second air guide portion comprises the second air guide surface; and the second air guide portion bends and extends relative to the axial direction.

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

4. The fan according to claim 1, whereinin an axial cross-section of the fan, a section line of the first air guide surface and a section line of the second air guide surface are curved lines, and have substantially equal curvatures.

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

6. The fan according to claim 5, wherein10°<θ1-θ2< 20°.

7. The fan according to claim 2, whereinin an axial cross-section of the fan, a junction between the second air guide portion and the suction portion is provided with a first tangent line tangent to the second air guide surface, and a junction between the first air guide portion and the rotary shaft mounting portion is provided with a third tangent line tangent to the first air guide surface; anda first included angle θ1 is formed between the first tangent line and an axis of the fan, and a third included angle θ3 is formed between the third tangent line and the axis, wherein θ3≥θ1.

8. The fan according to claim 2, whereinalong the radial direction of the fan, a first spacing H1 is formed between an air outlet end of the suction portion and an axis of the fan, and a second spacing H2 is formed between an outer peripheral end of the first air guide portion and the axis, wherein H1< H2.

9. The fan according to claim 2, whereinin an axial cross-section of the fan, a first connecting line is formed between an end of the second air guide portion adjacent to an upstream side of the fan and an outer peripheral end of the first air guide portion, and the first connecting line intersects with an axis of the fan.

10. A fan, comprising:a first air guide member comprising a first air guide portion extending obliquely outward along a radial direction of the fan;a second air guide member comprising a second air guide portion extending obliquely outward along the radial direction of the fan, wherein the first air guide portion is spaced apart from the second air guide portion; anda plurality of blades connected between the first air guide portion and the second air guide portion;wherein the first air guide portion has an obliquely extended length of L3, and the second air guide portion has an obliquely extended length of L4, wherein L3≤ L4.

11. The fan according to claim 10, whereinthe first air guide member comprises a rotary shaft mounting portion, and the first air guide portion is connected to a peripheral side of the rotary shaft mounting portion; andthe second air guide member comprises a suction portion configured to suck air, and the second air guide portion is connected to a peripheral side of the suction portion.

12. The fan according to claim 10, whereinin an axial cross-section of the fan, the first air guide portion and the second air guide portion extend along straight lines, respectively; or,in the axial cross-section of the fan, one of the first air guide portion and the second air guide portion extends along a straight line, while the other of the first air guide portion and the second air guide portion extends along a curved line; or,in the axial cross-section of the fan, the first air guide portion and the second air guide portion extend along curved lines, respectively.

13. The fan according to claim 11, whereinalong the radial direction of the fan, a first spacing H1 is formed between an air outlet end of the suction portion and an axis of the fan, and a second spacing H2 is formed between an outer peripheral end of the first air guide portion and the axis, wherein H1< H2.

14. The fan according to claim 10, whereinan 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, wherein the inclination angle θ4 is formed between the first air guide portion and an axis of the fan, and the inclination angle θ5 is formed between the second air guide portion and the axis of the fan.

15. A fan, comprising:a first air guide member comprising a first air guide portion;a second air guide member comprising a second air guide portion, wherein the first air guide portion is spaced apart from the second air guide portion; anda plurality of blades connected between the first air guide portion and the second air guide portion;wherein along a radial direction of the fan, a first spacing H1 is formed between an end of the second air guide portion adjacent to an upstream side of the fan and an axis of the fan, and a second spacing H2 is formed between an outer peripheral end of the first air guide portion and the axis, wherein H1< H2.

16. The fan according to claim 15, whereinthe first air guide member comprises a shaft mounting portion, and the first air guide portion is connected to a peripheral side of the shaft mounting portion; andthe second air guide member comprises a suction portion configured to suck air, and the second air guide portion is connected to a peripheral side of the suction portion.

17. The fan according to claim 15, whereinin an axial cross-section of the fan, the first air guide portion and the second air guide portion extend along straight lines, respectively; or,in the axial cross-section of the fan, one of the first air guide portion and the second air guide portion extends along a straight line, while the other of the first air guide portion and the second air guide portion extends along a curved line; or,in the axial cross-section of the fan, the first air guide portion and the second air guide portion extend along curved lines, respectively.

18. The fan according to claim 15, whereinin an axial cross-section of the fan, the first air guide portion has an extended length of L3, and the second air guide portion has an extended length of L4, wherein L3≤ L4.

19. The fan according to claim 15, whereinan 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, wherein the inclination angle θ4 is formed between the first air guide portion and the axis of the fan, and the inclination angle θ5 is formed between the second air guide portion and the axis of the fan.

Images