CN111441977B - Axial flow fan blade, fan assembly and air conditioner with same - Google Patents

Axial flow fan blade, fan assembly and air conditioner with same Download PDF

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Publication number
CN111441977B
CN111441977B CN202010337597.4A CN202010337597A CN111441977B CN 111441977 B CN111441977 B CN 111441977B CN 202010337597 A CN202010337597 A CN 202010337597A CN 111441977 B CN111441977 B CN 111441977B
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China
Prior art keywords
arc
blade
hub
shaped section
guide
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Application number
CN202010337597.4A
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Chinese (zh)
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CN111441977A (en
Inventor
钱培
刘佳薇
蒋力
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Application filed by Aux Air Conditioning Co Ltd, Ningbo Aux Electric Co Ltd filed Critical Aux Air Conditioning Co Ltd
Priority to CN202010337597.4A priority Critical patent/CN111441977B/en
Publication of CN111441977A publication Critical patent/CN111441977A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/388—Blades characterised by construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • F04D29/547—Ducts having a special shape in order to influence fluid flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention provides an axial flow fan blade, a fan assembly and an air conditioner thereof, wherein the axial flow fan blade comprises a hub, blades and a guide wing structure, and the blades are arranged around the hub; the two side surfaces of the blade are respectively a suction surface and a pressure surface, and the guide wing structure is convexly arranged at one end, far away from the hub, of the pressure surface. According to the axial flow fan blade, the guide wing structure is arranged on the pressure surface of the blade so as to block air flow flowing from the pressure surface of the blade to the top of the blade, and the air flow flowing through the pressure surface of the blade is prevented from flowing back to the side of the suction surface of the blade along the pressure surface from the top of the blade, so that the leakage amount of the air flow at the top of the blade when the fan discharges air is reduced, the air output loss of the fan is reduced, and the air output of the fan is improved.

Description

Axial flow fan blade, fan assembly and air conditioner with same
Technical Field
The invention relates to the technical field of air conditioners, in particular to an axial flow fan blade, a fan assembly and an air conditioner with the same.
Background
At present, an axial flow fan blade and a semi-open type guide ring surrounding the periphery of the axial flow fan blade are widely used in an air conditioner outdoor unit fan system. Because the internal diameter of the guide ring is slightly larger than the maximum diameter of the axial flow fan blade, a gap exists between the inner wall of the guide ring and the top (namely the top of the blade) of the axial flow fan blade, when the fan in the outdoor unit works, air flow in the outdoor unit flows from the front edge to the rear edge of the axial flow fan blade, and easily flows back to the suction side of the blade from the pressure surface of the blade through the top of the blade, so that the air flow flowing into between the top of the blade and the inner wall of the guide ring is prevented from being blown out of the fan through the guide ring, the air flow is leaked at the top of the blade, and the air output of the fan is reduced.
Disclosure of Invention
The invention solves the problems that: how to reduce the leakage of air flow at the blade top when the fan is out.
In order to solve the problems, the invention provides an axial flow fan blade, which comprises a hub, blades and a guide vane structure, wherein the blades are arranged around the hub; the two side surfaces of the blade are respectively a suction surface and a pressure surface, and the guide wing structure is convexly arranged at one end, far away from the hub, of the pressure surface.
The axial flow fan blade and the guide ring are coaxially arranged, and the guide wing structure is in a strip shape and is convexly arranged at one end of the pressure surface, which is far away from the hub; when the axial flow fan blade rotates, when the air flow flows from the pressure surface of the blade to the edge of one end of the pressure surface far away from the hub, the guide wing structure can inhibit the speed component of the air flow flowing from the pressure surface of the blade to the top of the blade along the radial outward direction of the hub, namely, the air flow is blocked from flowing along the radial outward direction of the hub, the air flow flowing through the pressure surface of the blade can be prevented from flowing back to the side of the suction surface of the blade along the pressure surface from the top of the blade, which is equivalent to reducing the leakage quantity of the air flow at the top of the blade when the fan discharges air, so that the air output loss of the fan is reduced, and the air output of the fan is increased; moreover, the guide vane structure reduces the intensity of the tip leakage vortex generated by the leakage of the air flow at the tip, thereby reducing the vortex noise of the tip.
Optionally, the blade has an outer edge, the outer edge being an edge portion of the blade at an end remote from the hub; the guide wing structure is connected with the outer edge.
Therefore, the distance between one end of the guide vane structure in the rotating direction of the hub and the outer edge is 0, so that when the distance between one end of the guide vane structure in the rotating direction of the hub and the outer edge is larger than 0, the air flow is easy to separate at one end of the guide vane structure in the rotating direction of the hub, and flows from the position between the guide vane structure and the outer edge to the top of the blade along the pressure surface of the blade.
Optionally, the outer edge includes a first arcuate segment and a second arcuate segment, a direction from the first arcuate segment to the second arcuate segment being opposite to a rotational direction of the hub; and the curvature of the first arc-shaped section is smaller than that of the second arc-shaped section, and the guide wing structure is positioned at the joint of the first arc-shaped section and the second arc-shaped section.
Therefore, the outer edge of the blade comprises a first arc-shaped section and a second arc-shaped section, and the first arc-shaped section and the second arc-shaped section are connected in a smooth transition manner; the second arc-shaped section with smaller curvature radius is arranged in the guide ring, and the distance between the second arc-shaped section and the inner wall of the guide ring is gradually increased in the direction from the suction surface to the pressure surface of the blade, so that an air outlet channel of the fan has larger volume, and the air outlet quantity of the fan is improved; the guide wing structure is preferably arranged at the joint of the first arc-shaped section and the second arc-shaped section so as to prevent air flow which is easy to flow back to the side where the suction surface is located from the joint of the first arc-shaped section and the second arc-shaped section.
Optionally, the vertical distance from the first arc-shaped section to the hub axis is a fixed value, and the vertical distance from the second arc-shaped section to the hub axis gradually decreases from the connection position of the second arc-shaped section and the first arc-shaped section to the position, away from the connection position, of the second arc-shaped section.
Therefore, when the first arc-shaped section is arranged outside the area surrounded by the guide ring, the blades and the air flow in the outdoor unit have larger contact area, so that the blades can drive more air flow to blow out of the outdoor unit through the guide ring; moreover, the second arc-shaped section with smaller curvature radius than the first arc-shaped section is arranged in the guide ring, and the distance between the second arc-shaped section and the inner wall of the guide ring is gradually increased in the direction from the suction surface to the pressure surface of the blade, so that the air outlet channel of the fan has larger volume, and the air outlet quantity of the fan is improved.
Optionally, the extending direction of the guide wing structure is opposite to the rotating direction of the hub; the guide wing structure is provided with a large end and a small end, and the extending direction of the guide wing structure is the direction from the large end to the small end.
Therefore, the extending direction of the guide wing structure is opposite to the rotating direction of the hub, when the axial flow fan blade rotates, the guide wing structure is impacted by the foreign matters, the large end of one end, which is positioned on the guide wing structure and is the same as the rotating direction of the hub, is contacted with the foreign matters, and the guide wing structure has a certain width at the large end, so that the guide wing structure can bear larger impact resistance and can ensure the stable operation of the axial flow fan blade.
Optionally, the orthographic projection of the guide wing structure on the blade where the guide wing structure is located is in a wing shape; and the distance from the large end to the outer edge is smaller than the distance from the small end to the outer edge.
Therefore, in the extending direction of the guide wing structure, the distance from the guide wing structure to the outer edge of the blade where the guide wing structure is located is gradually increased, so that the speed and the air quantity flowing towards the direction of the hub can be obtained when the air flows along the side surface of the guide wing structure towards one side of the hub, the air flow is prevented from continuing to flow to the top of the blade after leaving the guide wing structure, and the air flow finally leaves the pressure surface and flows out of the outdoor unit towards the direction away from the pressure surface, and the diversion effect of the guide wing structure is guaranteed.
Optionally, an included angle between a line between the large end and the small end and a tangent line at a connection point of the first arc-shaped section and the second arc-shaped section is less than or equal to 30 °.
Therefore, the included angle between the connecting line between the large end and the small end and the tangent line at the joint of the first arc-shaped section and the second arc-shaped section is 0-30 degrees, so that the airflow of the pressure surface is blocked from flowing to the side where the suction surface is located, the airflow is prevented from being separated at the large end of the guide wing structure, and the blocking effect of the guide wing structure on the airflow is ensured.
Optionally, a ratio of a distance from the large end to the small end of the guide wing structure to the outer edge arc length of the blade where the guide wing structure is located is between 0.02 and 0.2.
Therefore, the ratio of the distance from the large end to the small end to the outer edge arc length is between 0.02 and 0.2, so that the guide wing structure can prevent the air flow from flowing to the suction surface from the joint of the first arc-shaped section and the second arc-shaped section, and simultaneously, the rotation of the axial fan blade can not be greatly hindered.
Optionally, a ratio of a height of the protrusion of the guide wing structure to a thickness of the blade at a junction of the first arcuate segment and the second arcuate segment is between 0.5 and 2; wherein the thickness of the blade is the perpendicular distance between the suction surface and the pressure surface.
Therefore, the ratio of the height of the bulge of the guide wing structure on the pressure surface to the thickness of the blade at the joint of the first arc-shaped section and the second arc-shaped section is between 0.5 and 2, so that the guide wing structure has the effect of blocking the airflow from flowing to the suction surface from the joint of the first arc-shaped section and the second arc-shaped section, and simultaneously, the rotation of the axial fan blade is not greatly hindered; and because the guide wing structure has a certain protruding height, the rigidity of the blade at the joint of the first arc-shaped section and the second arc-shaped section is increased, so that the deformation of the blade is prevented.
Optionally, the blade further has a trailing edge, where the trailing edge is an edge part of the blade opposite to the rotation direction of the hub, and one end of the trailing edge is connected to the hub, and the other end of the trailing edge is connected to the second arc segment; the guide wing structures are arranged in a plurality, the guide wing structures are all located between the connection of the first arc-shaped section and the second arc-shaped section and the connection of the rear edge and the outer edge, and the guide wing structures are distributed at intervals along the rotation direction of the hub.
Therefore, the guide wing structures which are distributed at intervals are arranged on the blades so as to prevent air flow on the pressure surface from flowing from the second arc-shaped section to the suction surface, reduce leakage of the air flow at the second arc-shaped section and reduce air output loss of the fan.
Optionally, an included angle of a perpendicular line between the large end or the small end of each adjacent two guide wing structures and the hub axis is greater than or equal to 10 ° and less than or equal to 30 °.
Therefore, in the two adjacent guide wing structures, the value range of an included angle t between the vertical connecting line between the large end (small end) of one guide wing structure and the wheel hub axis and the vertical connecting line between the large end (small end) of the other guide wing structure and the wheel hub axis is 10-30 degrees; the guide wing structure is guaranteed to play a role in blocking airflow from the second arc section to the side where the suction surface is located, and meanwhile, the rotation of the axial fan blade is not greatly blocked.
Optionally, the blade further has a front edge, wherein the front edge is an edge part on the blade in the same rotation direction as the hub, one end of the front edge is connected with the hub, and the other end of the front edge is connected with the first arc-shaped section; and the leading edge has a line shape that is the fastest decreasing line shape.
Therefore, the front edge line type of the axial flow fan blade is the most speed-reducing line (namely cycloid, also called spinning line) so that the flow resistance of the air flow on the front edge is minimum, the centrifugal force generated when the air flow rotates along with the blades can be balanced better, the air flow is restrained from flowing outwards along the radial direction of the hub, the leakage loss of the top of the air flow is reduced, the air output of the fan is improved, and the heat exchange effect of the fan is further improved.
Optionally, an XY coordinate system is established on a plane perpendicular to the hub axis, a straight line where a connecting line between two ends of the front edge is located is taken as an X axis, a straight line perpendicular to the X axis and passing through one end of the front edge connected with the hub is taken as a Y axis, and a linear equation of the front edge is as follows:
Where k is a coefficient, L is a distance between two ends of the front edge on the X axis, θ is an angle between a line between a point on the front edge and an origin of the XY coordinate system and the X axis, X is a vertical distance from the point on the front edge to the Y axis, and Y is a vertical distance from the point on the front edge to the X axis.
Therefore, the front edge is in the shape of the fastest falling line, so that the time of airflow from the blade tip to the blade root along the front edge is shortest, the resistance received by the airflow during flowing is minimum, the centrifugal force generated by the airflow during rotating along with the blades can be balanced better, the airflow is restrained from flowing outwards along the radial direction of the hub, the leakage loss of the blade tip of the airflow is reduced, the air output of the fan is improved, and the heat exchange effect of the fan is further improved.
Optionally, an orthographic projection of a connection of the leading edge and the first arc segment on a plane perpendicular to the hub axis is arc-shaped or elliptical arc-shaped.
Therefore, the connection part of the first arc-shaped section of the outer edge of the blade and the front edge of the blade is rounded, so that the connection part of the first arc-shaped section and the front edge is arc-shaped or elliptical arc-shaped, the safety of the blade is improved, and the blade is prevented from scratching a human body; the arc or the elliptic arc is in smooth transition with the front edge and the first arc section, so that the high-order curvature continuity of the curve of the blade at the blade tip is ensured, the separation of air flow at the blade tip is inhibited, and the aerodynamic performance of the axial flow fan blade is improved.
In order to solve the problems, the invention also provides a fan assembly, which comprises a guide ring and the axial flow fan blade, wherein the axial flow fan blade and the guide ring are coaxially arranged; the air flow flowing into the guide ring flows in from the first air guide part and flows out from the third air guide part, and the inner diameter of the end part of the first air guide part far away from the second air guide part and the inner diameter of the end part of the third air guide part far away from the second air guide part are both larger than the inner diameter of the second air guide part.
The fan assembly has the same advantages as the axial flow fan blade compared with the prior art, and the description is omitted here.
Optionally, the blade has an outer edge, the outer edge includes first arc section and second arc section, the junction of first arc section with second arc section is located the region that first wind-guiding portion encloses.
Therefore, the connection part of the first arc-shaped section and the second arc-shaped section is positioned in the area surrounded by the first air guide part, so that most of the first arc-shaped section is positioned outside the area surrounded by the first air guide part, the blades have larger contact area with the air flow in the outdoor unit, and more air flow can be blown out of the outdoor unit through the guide ring; meanwhile, the first air guide part is used as an inlet guide arc to guide the air flow to flow into the guide ring, and the air flow has a speed component pointing to the axial direction of the hub (namely, radially inwards along the hub) when flowing in the inlet guide arc, so that the air flow can inhibit the flow of the air flow flowing from the pressure surface of the blade to the blade tip, thereby preventing the air flow from generating vortex and blade tip leakage at the joint of the first arc section and the second arc section, and further reducing the leakage amount of the air flow at the blade tip when the fan is out.
Optionally, the front projection of the first wind guiding part on a plane parallel to the axis of the hub is in a horn shape, and the two sections of arcs are respectively positioned at two ends of the front projection of the first wind guiding part in the direction vertical to the axis of the hub; the ratio of the vertical distance from the connecting part of the first arc-shaped section and the second arc-shaped section to the end face of the first air guide part far away from the second air guide part to the radius of the circular arc is between 0.1 and 0.9.
Therefore, the first air guide part is in a horn mouth shape, the connection part of the first arc section and the second arc section is positioned in the area surrounded by the first air guide part, so that when the air flow enters the guide ring by attaching to the inner wall of the first air guide part, the air flow has a radial speed flowing towards the position of the hub, the guide wing structure can further guide the air flow to flow on the pressure surface of the blade so as to balance the rotating centrifugal force of the air flow, the air flow positioned on the pressure surface flows from the outer edge to the side of the suction surface, the leakage quantity of the air flow at the top of the blade when the fan is out is reduced, the air output loss of the fan is reduced, the vortex noise of the top of the blade is reduced, and the air guide efficiency of the axial flow fan blade is improved.
In order to solve the above problems, the present invention further provides an air conditioner, which includes the axial flow fan blade and/or the fan assembly.
The air conditioner has the same advantages as those of the axial flow fan blade or the fan assembly compared with the prior art, and the description is omitted herein.
Drawings
FIG. 1 is a schematic view of axial flow fan blade in an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B;
FIG. 4 is a schematic view of another view angle of axial flow fan blades according to an embodiment of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4 at C;
FIG. 6 is a schematic diagram of a fan assembly in accordance with an embodiment of the present invention;
FIG. 7 is a schematic diagram of a structure of an embodiment of the invention from another perspective of a fan assembly;
FIG. 8 is an enlarged view of a portion of FIG. 7 at D;
FIG. 9 is a schematic view of a blade and hub according to an embodiment of the present invention;
fig. 10 is a schematic structural view of a vane and guide vane structure according to an embodiment of the present invention.
Reference numerals illustrate:
1-axial flow fan blades; 11-leaf; 111-trailing edge; 112-leading edge; 113-an outer edge; 1131-a first arcuate segment; 1132-a second arcuate segment; 12-a hub; 13-guiding wing structure; 131-big end; 132—small end; 2-a guide ring; 21-a first air guide; 22-a second wind guiding part; 23-a third wind guiding part.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the description of the present invention, it should be noted that directions or positional relationships indicated by terms "upper", "lower", "left", "right", "high", "low", etc. are based on the orientation or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1 and 4, the present invention provides an axial flow fan blade 1, which includes a hub 12, blades 11 and a guiding vane structure 13, wherein the blades 11 are disposed around the hub 12 and located in a radial direction of the hub 12; the two sides of the blade 11 are respectively a suction surface and a pressure surface, and the guide wing structure 13 is convexly arranged at one end of the pressure surface, which is far away from the hub 12.
The axial flow fan blade 1 comprises a hub 12 and at least two blades 11 arranged around the hub 12, wherein the blades 11 and the hub 12 can be integrally formed (such as integral casting) or welded, riveted or connected by using fasteners; the hub 12 is columnar, one end of the blade 11 is connected with the hub 12, and the other end extends along the radial direction of the hub 12 in a direction away from the hub 12; the blades 11 are flat or arc-shaped to facilitate wind guiding. The two sides of the blade 11 are respectively a suction surface and a pressure surface, the suction surface of the blade 11 faces the inside of the outdoor unit, the pressure surface of the blade 11 faces the outside of the outdoor unit, when the axial flow fan blade 1 rotates, the blade 11 drives the air flow on the side where the suction surface is located to flow through the pressure surface and flow in a direction away from the pressure surface, and the heat absorbed by the fan from the condenser is blown out of the outdoor unit along with the air flow, which is worth to be explained, in this embodiment, the rotation of the axial flow fan blade 1 refers to the rotation of the axial flow fan blade 1 when the axial flow fan blade 1 operates, ω in fig. 1 is the rotation direction of the hub 12, and is also the rotation direction (or rotation direction) of the axial flow fan blade 1.
The axial flow fan blade 1 and the guide ring 2 are coaxially arranged, and because a gap exists between the top of the blade 11 (namely, one end of the blade 11 far away from the hub 12) and the inner wall of the guide ring 2, when the axial flow fan blade 1 rotates, air flow easily flows back to the side where the suction surface is located from the edge of one end of the pressure surface of the blade 11 far away from the hub 12, and the air flow on the side where the suction surface is located is blocked from flowing to the side where the pressure surface is located through the top of the blade, so that the air flow leaks at the top of the blade, and the air output of the fan is reduced; moreover, the airflow is liable to generate vortex at the tip of the blade, that is, tip leakage vortex is formed, and large noise is generated. This problem is solved by providing the guide vane structure 13 at the end of the pressure surface of the blade 11 remote from the hub 12, specifically, the guide vane structure 13 is in the shape of a bar and is protruded at the edge of the pressure surface remote from the end of the hub 12; the guide vane structure 13 may be connected to an edge of the pressure surface of the blade 11, which is far away from the hub 12, or the guide vane structure 13 may be disposed near an edge of the pressure surface of the blade 11, which is far away from the hub 12, i.e. the guide vane structure 13 is not connected to an edge of the pressure surface, which is far away from the hub 12, but has a certain distance. When the axial flow fan blade 1 rotates, the airflow flowing on the pressure surface of the blade 11 has a velocity component along the radial direction of the hub 12 outwards (i.e. towards the direction away from the hub 12), so that the airflow easily flows away from the hub 12, when the airflow flows to the edge of the pressure surface away from one end of the hub 12, the guide vane structure 13 can block the airflow along the radial direction of the hub 12, prevent the airflow from flowing back to the side of the suction surface of the blade 11 from the top of the blade, and enable the airflow blocked by the guide vane structure 13 to flow along the guide vane structure 13 towards the side of one side of the hub 12 (the guiding effect of the guide vane structure 13 on the airflow), so that the airflow continues to flow along the pressure surface and finally flows out of the outdoor unit; in this way, the leakage amount of the air flow at the top of the blade when the air outlet of the fan is reduced is equivalent to that, so that the air outlet loss of the fan is reduced, the air outlet of the fan is increased, and in addition, the strength of the top leakage vortex formed at the top of the blade is weakened due to the reduction of the leakage amount of the air flow at the top of the blade, so that the noise of the top leakage vortex is reduced; and the air flow on the side of the suction surface is not easy to be blocked by the backflow air flow at the blade tip when flowing to the side of the pressure surface through the blade tip, and after flowing to the side of the pressure surface through the blade tip, the air flow can flow to the pressure surface along the side of the guide wing structure 13 towards one side of the hub 12 under the guiding action of the guide wing structure 13, and finally flows out of the outdoor unit along the pressure surface.
The guide wing structure 13 is arranged at the edge of one end, far away from the hub 12, of the pressure surface of the blade 11 so as to inhibit the speed component of the air flow flowing from the pressure surface of the blade 11 to the blade tip and outwards along the radial direction of the hub 12, namely, the air flow is blocked from flowing along the radial direction of the hub 12, the air flow flowing through the pressure surface of the blade 11 can be prevented from flowing back to the side of the suction surface of the blade 11 along the pressure surface from the blade tip, the leakage amount of the air flow at the blade tip during the air outlet of the fan is reduced, the air outlet loss of the fan is reduced, and the air outlet of the fan is increased; also, the provision of the guide vane structure 13 weakens the strength of the tip leakage vortex generated due to the leakage of the air flow at the tip, thereby reducing the vortex noise at the tip.
Alternatively, as shown in connection with fig. 2 and 6, the blade 11 has an outer edge 113, and the outer edge 113 is an edge portion of the end of the blade 11 away from the hub 12; the guide vane structure 13 is connected to the outer rim 113.
The blade 11 has a leading edge 112 (described in detail later), an outer edge 113, and a trailing edge 111 (described in detail later) which are connected in this order, and the direction from the trailing edge 111 to the leading edge 112 of the blade 11 is the same as the rotational direction of the hub 12, that is, the leading edge 112 is an edge portion of the blade 11 which is the same as the rotational direction of the hub 12, and the trailing edge 111 is an edge portion of the blade 11 which is opposite to the rotational direction of the hub 12. The guide vane structure 13 is preferably connected to the outer edge 113 of the blade 11 such that the distance between the end of the guide vane structure 13 in the rotational direction of the hub 12 and the outer edge 113 is 0, to avoid that when the distance between the end of the guide vane structure 13 in the rotational direction of the hub 12 and the outer edge 113 is greater than 0, the air flow is easily separated at the end of the guide vane structure 13 in the rotational direction of the hub 12 and flows from between the guide vane structure 13 and the outer edge 113 along the pressure surface of the blade 11 to the tip of the blade 11.
Optionally, the outer rim 113 includes a first arc-shaped section 1131 and a second arc-shaped section 1132, and a direction from the first arc-shaped section 1131 to the second arc-shaped section 1132 is opposite to a rotation direction of the hub 12; and the curvature of the first arc-shaped section 1131 is smaller than that of the second arc-shaped section 1132, and the guide wing structure 13 is positioned at the joint of the first arc-shaped section 1131 and the second arc-shaped section 1132.
The outer edge 113 of the blade 11 comprises a first arc-shaped section 1131 and a second arc-shaped section 1132, the first arc-shaped section 1131 and the second arc-shaped section 1132 are in smooth transition connection, and the curvature of the first arc-shaped section 1131 is smaller than that of the second arc-shaped section 1132, that is, the curvature radius of the first arc-shaped section 1131 is larger than that of the second arc-shaped section 1132, wherein the curvature radius is the inverse of the curvature, and the smaller the curvature radius is, the larger the corresponding curvature degree of the arc is; in this way, the second arc-shaped section 1132 with larger bending degree is arranged in the guide ring 2, and the distance between the second arc-shaped section 1132 and the inner wall of the guide ring 2 is gradually increased in the direction from the suction surface to the pressure surface of the blade 11, so that the air outlet channel of the fan has larger volume, and the air outlet quantity of the fan is improved. In a direction opposite to the rotational direction of the hub 12, the radius of curvature of the outer edge 113 of the blade 11 is changed (reduced) at the junction of the first arc-shaped section 1131 and the second arc-shaped section 1132, so that the air flow flowing through the pressure surface of the blade 11 easily flows back to the suction surface side from the junction of the first arc-shaped section 1131 and the second arc-shaped section 1132, and therefore, the guide vane structure 13 is preferably disposed at the junction of the first arc-shaped section 1131 and the second arc-shaped section 1132 to block the air flow flowing through the pressure surface of the blade 11 from flowing back to the suction surface side from the junction of the first arc-shaped section 1131 and the second arc-shaped section 1132, thereby reducing the leakage amount of the air flow flowing through the pressure surface of the blade 11 at the tip of the blade 11.
Optionally, the vertical distance from the first arc-shaped section 1131 to the axis of the hub 12 is constant, and the vertical distance from the second arc-shaped section 1132 to the axis of the hub 12 gradually decreases from the connection between the second arc-shaped section 1132 and the first arc-shaped section 1131 to the distance between the second arc-shaped section 1132 and the connection.
The direction from one end of the second arc-shaped section 1132 connected with the first arc-shaped section 1131 to the other end of the second arc-shaped section 1132 is opposite to the rotation direction of the hub 12, and based on the fact that the curvature of the first arc-shaped section 1131 is smaller than that of the second arc-shaped section 1132, in the direction opposite to the rotation direction of the hub 12, in this embodiment, the vertical distance from the outer edge 113 of the blade 11 to the axis of the hub 12 is gradually reduced from the connection position of the first arc-shaped section 1131 and the second arc-shaped section 1132; specifically, for the orthographic projection of the axial flow fan blade 1 on the plane perpendicular to the axis of the hub 12, the first arc-shaped section 1131 forms a section of arc in the orthographic projection, the diameter of the circle where the arc is located is denoted as d1, and the center of the circle where the arc is located is on the axis of the hub 12; the first arcuate segment 1131 is a constant distance d1/2 from the axis of the hub 12 in a direction opposite to the rotational direction of the hub 12; the second arc-shaped section 1132 has a smooth curve section in the orthographic projection, and the distance between the curve section and the axis of the hub 12 gradually decreases from the end of the second arc-shaped section 1132 connected with the first arc-shaped section 1131 to the end of the second arc-shaped section 1132 away from the first arc-shaped section 1131. The vertical distance from the end, connected with the first arc-shaped section 1131, of the second arc-shaped section 1132 to the axis of the hub 12 is d1/2, and the diameter of the circle where the end, away from the first arc-shaped section 1131, of the second arc-shaped section 1132 is d2, and the vertical distance from the end, away from the first arc-shaped section 1131, of the second arc-shaped section 1132 to the axis of the hub 12 is d2/2, wherein d1 is greater than d2.
The arrangement is that the vertical distance from the first arc section 1131 to the axis of the hub 12 is the largest in the vertical distance from each position on the outer edge 113 of the vane 11 to the axis of the hub 12, so that when the first arc section 1131 is arranged outside the area surrounded by the guide ring 2, the vane 1 has larger contact area with the air flow inside the outdoor unit, and the vane 1 can drive more air flow to blow out of the outdoor unit through the guide ring 2; moreover, the second arc-shaped section 1132 with a bending degree larger than that of the first arc-shaped section 1131 is arranged in the guide ring 2, and the distance between the second arc-shaped section 1132 and the inner wall of the guide ring 2 is gradually increased in the direction from the suction surface to the pressure surface of the blade 11, so that the air outlet channel of the fan has a larger volume, and the air outlet quantity of the fan is improved.
Alternatively, as shown in connection with fig. 2, the extending direction of the guide wing structure 13 is opposite to the rotating direction of the hub 12; the guiding wing structure 13 has a large end 131 and a small end 132, and the extending direction of the guiding wing structure 13 is the direction from the large end 131 to the small end 132.
The width of the guide vane structure 13 at the large end 131 is greater than the width of the guide vane structure 13 at the small end 132, wherein the width of the guide vane structure 13 refers to the dimension of the guide vane structure 13 in the radial direction of the hub 12; the direction from the large end 131 to the small end 132 of the guide wing structure 13 is opposite to the rotation direction of the hub 12, so when the axial flow fan blade 1 rotates, when the guide wing structure 13 is impacted by foreign matters (such as gravel and insects), the large end 131 at the end of the guide wing structure 13 with the same rotation direction as the hub 12 is firstly contacted with the foreign matters, and the guide wing structure 13 has a certain width at the large end 131, so that the axial flow fan blade 1 can bear larger impact resistance and can be ensured to stably run.
Optionally, the front projection of the guiding wing structure 13 on the blade 11 where it is located is wing-shaped; and the distance from the large end 131 to the outer edge 113 is smaller than the distance from the small end 132 to the outer edge 113.
In the extending direction of the guide vane structure 13, the distance from the guide vane structure 13 to the outer edge 113 of the blade 11 where the guide vane structure is located is gradually increased, and correspondingly, the vertical distance from the guide vane structure 13 to the axis of the hub 12 is gradually reduced, so that the air flow can obtain the speed and the air quantity flowing towards the hub 12 when flowing along the side surface of the guide vane structure 13 towards one side of the hub 12, the air flow is prevented from continuing to flow to the top of the blade after leaving the guide vane structure 13, and the air flow finally leaves the pressure surface and flows out of the outdoor unit in the direction away from the pressure surface, and the guiding function of the guide vane structure 13 is ensured.
Optionally, as shown in connection with fig. 2, the line between the large end 131 and the small end 132 may have an angle of less than or equal to 30 ° with the tangent line at the junction of the first curved segment 1131 and the second curved segment 1132.
The guide vane structure 13 has an airfoil shape in front projection on the vane 11. In the orthographic projection, the large end 131 of the guiding wing structure 13 is an arc section in the orthographic projection, and the small end 132 of the guiding wing structure 13 is a sharp point in the orthographic projection; since the direction from the large end 131 to the small end 132 is opposite to the rotation direction of the hub 12, the large end 131 of the guide wing structure 13 is also the front end of the guide wing structure 13, and the small end 132 of the guide wing structure 13 is also the rear end of the guide wing structure 13; the point may be referred to as the rear end point of the orthographic projection of the guide wing structure 13, and the point on the arc segment with the largest distance from the rear end point is referred to as the front end point of the orthographic projection; while the connection between the large end 131 and the small end 132 refers to the connection between the front end point and the rear end point. The value range of the included angle beta between the connecting line between the large end 131 and the small end 132 and the tangent line at the connecting position of the first arc-shaped section 1131 and the second arc-shaped section 1132 is 0-30 degrees; if the included angle β is too large (greater than 30 °), the airflow is easily separated at the large end 131 of the guiding vane structure 13, so that a part of the airflow flows to one side of the guiding vane structure 13 facing the hub 12, and another part of the airflow flows to one side of the guiding vane structure 13 facing away from the hub 12 and flows from the top of the blade 11 to the side of the suction surface of the blade 11, so that the blocking effect of the guiding vane structure 13 on the airflow (i.e., the blocking airflow flowing along the radially outward direction of the hub 12) is weakened; therefore, the included angle beta is 0-30 degrees, so that the air flow is prevented from being separated at the large end 131 of the guide wing structure 13, the blocking effect of the guide wing structure 13 on the air flow is guaranteed, and the leakage amount of the air flow at the blade top is reduced when the fan outputs air.
Alternatively, as shown in connection with fig. 1 and 2, the ratio of the distance from the large end 131 to the small end 132 of the guiding vane structure 13 to the arc length of the outer edge 113 of the vane 11 where the guiding vane structure 13 is located is between 0.02 and 0.2.
According to the foregoing, the connection line between the large end 131 and the small end 132 of the guiding wing structure 13 is the connection line between the front end point and the rear end point of the front projection of the guiding wing structure 13 on the blade 11, the distance from the large end 131 to the small end 132 refers to the length b of the connection line between the front end point and the rear end point, the arc length of the outer edge 113 is the sum S of the arc lengths of the first arc segment 1131 and the second arc segment 1132, and the ratio of b to S is between 0.02 and 0.2. If the ratio of b to S is smaller than 0.02, the effect of blocking the backflow of the air flow of the guide wing structure 13 to the side where the suction surface is located is poor; the guide vane structure 13 has a certain weight, so that the weight of the blade 11 at the top of the blade is increased, and if the ratio of b to S is greater than 0.2, the volume and the weight of the guide vane structure 13 are increased, so that the resistance brought by the guide vane structure 13 is increased when the axial flow fan blade 1 rotates; therefore, the ratio of b to S is between 0.02 and 0.2, so as to ensure that the guide vane structure 13 has the function of blocking the airflow from flowing from the junction of the first arc-shaped section 1131 and the second arc-shaped section 1132 to the suction surface, and meanwhile, the rotation of the axial fan blade 1 is not greatly blocked.
Optionally, as shown in connection with fig. 4 and 5, the ratio of the height of the protrusion of the guide vane structure 13 to the thickness of the blade 11 at the junction of the first arc-shaped section 1131 and the second arc-shaped section 1132 is between 0.5 and 2; wherein the thickness of the blade 11 is the perpendicular distance between the suction surface and the pressure surface.
The height of the protrusion of the guide vane structure 13 on the pressure surface of the vane 11 is denoted as h1, the thickness of the vane 11 at the joint of the first arc-shaped section 1131 and the second arc-shaped section 1132 is denoted as h2, and the ratio of h1 to h2 is between 0.5 and 2, wherein the height of the protrusion of the guide vane structure 13 refers to the vertical distance from one side of the guide vane structure 13 away from the pressure surface to the joint of the guide vane structure 13 and the pressure surface; if the ratio of h1 to h2 is smaller than 0.5, the protrusion height h1 of the guide wing structure 13 on the pressure surface is too small to effectively prevent the air flow from flowing back to the side where the suction surface of the blade 11 is located; because the guide vane structure 13 has a certain weight, the weight of the blade 11 at the top of the blade is increased, if the ratio of h1 to h2 is larger than 2, the protrusion height h1 of the guide vane structure 13 on the pressure surface is overlarge, the volume and the weight of the guide vane structure 13 can be increased, and the resistance brought by the guide vane structure 13 is increased when the axial flow fan blade 1 rotates; therefore, the ratio of h1 to h2 is between 0.5 and 2, so that the guide wing structure 13 has the function of blocking the air flow from the joint of the first arc-shaped section 1131 and the second arc-shaped section 1132 to the suction surface, and simultaneously, the rotation of the axial fan blade 1 is not greatly blocked; and, since the guide wing structure 13 has a certain protruding height, the rigidity of the blade 11 at the connection of the first arc-shaped section 1131 and the second arc-shaped section 1132 is increased, so as to prevent the deformation of the blade 11.
Optionally, as shown in fig. 6, 9 and 10, the blade 11 further has a trailing edge 111, where the trailing edge 111 is an edge portion of the blade 11 opposite to the rotation direction of the hub 12, and one end of the trailing edge 111 is connected to the hub 12, and the other end is connected to the second arc segment 1132; the plurality of guide wing structures 13 are arranged, the plurality of guide wing structures 13 are located between the connection of the first arc-shaped section 1131 and the second arc-shaped section 1132 and the connection of the rear edge 111 and the outer edge 113, and the plurality of guide wing structures 13 are distributed at intervals along the rotation direction of the hub 12.
In this embodiment, the guide vane structure 13 is provided with a plurality of guide vane structures, because the radius of curvature of the outer edge 113 of the blade 11 is changed (reduced) at the connection point of the first arc segment 1131 and the second arc segment 1132, so that the leakage of the tip of the air flow easily occurs between the connection point of the first arc segment 1131 and the second arc segment 1132 and the connection point of the trailing edge 111 and the outer edge 113, and therefore, the plurality of guide vane structures 13 are all arranged between the connection point of the first arc segment 1131 and the second arc segment 1132 and the connection point of the trailing edge 111 and the outer edge 113, so that when the axial flow fan blade 1 rotates, the guide vane structure 13 can prevent the air flow flowing along the pressure surface of the blade 11 to the end of the blade 11 far from the hub 12 from flowing back to the suction surface via the tip. The plurality of guide wing structures 13 are distributed at intervals along the rotation direction of the hub 12, namely, a space exists between two adjacent guide wing structures 13; so as to avoid the interference easily caused by the connection of two adjacent guide vane structures 13, and the blockage of the flow passage, thereby leading to larger air resistance when the axial flow fan blade 1 rotates.
Further, the guide wing structures 13 are equally spaced between the connection of the first arc-shaped section 1131 and the second arc-shaped section 1132 and the connection of the trailing edge 111 and the outer edge 113; if the spacing between two adjacent guide wing structures 13 is inconsistent in the plurality of guide wing structures 13, the stability of the blade 11 during rotation is not facilitated; therefore, the plurality of guide vane structures 13 are preferably distributed at equal intervals, and the large ends 131 of the plurality of guide vane structures 13 are all arranged at the second arc-shaped section 1132 of the outer edge 113, so that the air flow flowing on the pressure surface of the blade 11 is better prevented from flowing back to the side of the suction surface from the second arc-shaped section 1132, the leakage amount of the air flow at the second arc-shaped section 1132 is further reduced, the loss of the air output of the fan is reduced, and the air output of the fan is increased; moreover, the strength of the generated tip leakage vortex is further weakened, and the vortex noise of the tip leakage vortex is reduced.
Alternatively, as shown in connection with fig. 9 and 10, the included angle between the vertical line between the large end 131 or the small end 132 of each adjacent two of the guide wing structures 13 and the axis of the hub 12 is greater than or equal to 10 ° and less than or equal to 30 °.
On the basis that the plurality of guide wing structures 13 are arranged, the value range of the included angle t between the vertical connecting line between the large end 131 (the small end 132) of one guide wing structure 13 and the axis of the hub 12 and the vertical connecting line between the large end 131 (the small end 132) of the other guide wing structure 13 and the axis of the hub 12 in the two adjacent guide wing structures 13 is 10-30 degrees; if the included angle t is too small (smaller than 10 degrees), the distance between the adjacent guide vane structures 13 is too small, the adjacent guide vane structures are easy to interfere with each other, a flow passage is blocked, and the air resistance is larger when the axial flow fan blade 1 rotates; if the included angle t is too large (greater than 30 °), the distance between the adjacent guiding wing structures 13 is too large, and due to the size limitation of the blades 11, part of the guiding wing structures 13 easily exceed the pressure surface of the blades 11, so that the guiding wing structures 13 are influenced to guide the airflow on the pressure surface. The angle t is therefore preferably between 10 ° and 30 °.
Optionally, as shown in fig. 6 and 9, the blade 11 further has a front edge 112, where the front edge 112 is an edge portion of the blade 11 in the same rotation direction as the hub 12, and one end of the front edge 112 is connected to the hub 12, and the other end is connected to the first arc segment 1131; and the line shape of the leading edge 112 is the most rapidly decreasing line shape.
When the axial flow fan blade 1 rotates, the front edge 112 on the blade 11 is contacted with air flow formed when the fan rotates, and the air flow flows from the pressure surface to the rear edge 111 through the front edge 112 and leaves the pressure surface in a direction away from the pressure surface so as to flow out of the fan; the line shape of the front edge 112 is in a most speed-reducing line (i.e. cycloid, also called a spinning line) shape, so that the time for the air flow to flow from the blade tip (i.e. the end of the front edge 112 connected with the first arc-shaped section 1131) to the blade root (i.e. the end of the front edge 112 connected with the hub 12) along the front edge 112 is shortest, and the resistance to the air flow is smallest, so that the centrifugal force generated when the air flow rotates along with the blade 11 can be balanced better, the air flow is restrained from flowing outwards along the hub 12 in the radial direction, the leakage loss of the blade top of the air flow is reduced, the air output of the fan is improved, and the heat exchange effect of the fan is improved.
Alternatively, as shown in fig. 9, an XY coordinate system is established on a plane perpendicular to the axis of the hub 12, with a straight line where a line connecting both ends of the leading edge 112 is located being an X-axis, and a straight line perpendicular to the X-axis and passing through one end of the leading edge 112 connected to the hub 12 being a Y-axis, the linear equation of the leading edge 112 is:
Where k is a coefficient, L is a distance between two ends of the leading edge 112 on the X-axis, θ is an angle between a line connecting the point on the leading edge 112 and the origin of the XY coordinate system and the X-axis, X is a perpendicular distance from the point on the leading edge 112 to the Y-axis, and Y is a perpendicular distance from the point on the leading edge 112 to the X-axis.
The front projection of the front edge 112 on the XY plane in fig. 9 is an arc segment, two ends of the front edge 112 are two endpoints of the arc segment in the front projection, that is, the X axis is also a straight line where a connecting line between the two endpoints of the arc segment is located, and the distance L between the two ends of the front edge 112 is the length of the connecting line between the two endpoints of the arc segment. In the linear equation for the leading edge 112, k is a coefficient ranging from 0.1 to 10; the positive direction of the X axis is the direction from the end of the front edge 112 connected with the hub 12 to the end of the front edge 112 connected with the first arc-shaped section 1131, the positive direction of the Y axis is the direction from the end of the front edge 112 connected with the hub 12 to the side of the blade 11, the intersection point of the Y axis and the X axis is the origin of an XY coordinate system, and the included angle between the Y axis and the X axis is 90 degrees; the abscissa of a point on the leading edge 112 is x and the ordinate of the point is y. In this way, the leading edge 112 is in the most-speed descending line shape, so that the time for the airflow to flow from the blade tip to the blade root along the leading edge 112 is the shortest, the resistance to the airflow is the smallest, the centrifugal force generated when the airflow rotates along with the blade 11 can be balanced better, the airflow is restrained from flowing outwards along the radial direction of the hub 12, the leakage loss of the top of the airflow is reduced, the air output of the fan is improved, and the heat exchange effect of the fan is further improved. And because the front edge 112 inhibits the air flow from flowing radially outwards along the hub 12, the air flow obtains a radially inwards speed component when flowing through the front edge 112, so that the air flow flowing through the pressure surface is not easy to flow back to the side of the suction surface from the first arc-shaped section 1131, and when the air flow flows between the connection of the first arc-shaped section 1131 and the second arc-shaped section 1132 and the connection of the rear edge 111 and the outer edge 113, the guide wing structure 13 can block and guide the air flow, so that the air flow finally flows out of the outdoor unit smoothly.
Alternatively, as shown in connection with FIGS. 1,3, and 6, the front projection of the connection of the leading edge 112 to the first arcuate segment 1131 in a plane perpendicular to the axis of the hub 12 is arcuate or elliptical.
In this embodiment, the connection between the first arc section 1131 of the outer edge 113 of the blade 1 and the front edge 112 of the blade 1 is rounded, so that the connection between the first arc section 1131 and the front edge 112 is arc-shaped or elliptical arc-shaped, so as to improve the safety of the blade 11 and prevent the blade 11 from scratching the human body; and the circular arc or the elliptical arc is in smooth transition with the front edge 112 and the first arc section 1131 so as to ensure the high-order curvature continuity of the curve of the blade 11 at the blade tip and inhibit the separation of air flow at the blade tip, thereby improving the aerodynamic performance of the axial flow fan blade 1.
The invention also provides a fan assembly, which comprises the guide ring 2 and the axial flow fan blade 1, wherein the axial flow fan blade 1 and the guide ring 2 are coaxially arranged; the guide ring 2 comprises a first air guide part 21, a second air guide part 22 and a third air guide part 23 which are sequentially connected, the air flow flowing into the guide ring 2 flows in from the first air guide part 21 and flows out from the third air guide part 23, and the inner diameter of the end part of the first air guide part 21 far away from the second air guide part 22 and the inner diameter of the end part of the third air guide part 23 far away from the second air guide part 22 are both larger than the inner diameter of the second air guide part 22.
When the axial flow fan blade 1 rotates, the air flow sequentially passes through the first air guide part 21, the second air guide part 22 and the third air guide part 23, and finally flows out of the outdoor unit; the inner diameter of the end part of the first air guiding part 21 far away from the second air guiding part 22 and the inner diameter of the end part of the third air guiding part 23 far away from the second air guiding part 22 are larger than the inner diameter of the second air guiding part 22, so that more air flows enter the second air guiding part 22 from the first air guiding part 21 and then flow out from the third air guiding part 23. According to the fan assembly, the axial flow fan blades 1 and the guide rings 2 are coaxially arranged, the guide wing structures 13 are arranged on the pressure surfaces of the blades 11 of the axial flow fan blades 1, so that the speed components of the air flow flowing from the pressure surfaces of the blades 11 to the top of the blades along the radial direction of the hub 12 are restrained, namely the air flow is prevented from flowing along the radial direction of the hub 12, the air flow flowing through the pressure surfaces of the blades 11 can be prevented from flowing back to the side of the suction surface of the blades 11 along the pressure surfaces, the leakage quantity of the air flow at the top of the blades when the fan is discharged is reduced, the air outlet loss of the fan is reduced, and the air outlet quantity of the fan is increased; also, the provision of the guide vane structure 13 weakens the strength of the tip leakage vortex generated due to the leakage of the air flow at the tip, thereby reducing the vortex noise at the tip.
Alternatively, as shown in fig. 7 and 8, the blade 11 has an outer edge 113, where the outer edge 113 includes a first arc-shaped section 1131 and a second arc-shaped section 1132, and the connection between the first arc-shaped section 1131 and the second arc-shaped section 1132 is located in the area surrounded by the first wind guiding portion 21.
The connection between the first arc-shaped section 1131 and the second arc-shaped section 1132 is located in the area surrounded by the first wind guiding part 21, and the connection between the first arc-shaped section 1131 and the second arc-shaped section 1132 is provided with the guiding wing structure 13, that is, the guiding wing structure 13 is located in the area surrounded by the first wind guiding part 21, so that when the airflow flows back to the side of the suction surface through the gap between the blade tip and the guiding ring 2 at the edge of the pressure surface of the blade 11, which is far away from one end of the hub 12, the guiding wing structure 13 can inhibit the velocity component of the airflow flowing from the pressure surface of the blade 11 to the blade tip along the radial outward direction of the hub 12, that is, the airflow is blocked from flowing along the radial outward direction of the hub 12, The air flow is prevented from flowing back to the side of the suction surface of the blade 11 from the gap between the blade top and the inner wall of the first air guiding part 21, and further the air flow flowing into the gap between the blade top and the inner wall of the first air guiding part 21 from the side of the suction surface of the blade 11 is prevented from being blocked by the flowing back air flow and can not smoothly flow out of the outdoor unit, so that the leakage amount of the air flow at the blade top during the air outlet of the fan can be further reduced. Moreover, the first wind guiding part 21 and the third wind guiding part 23 are bell mouth-shaped, and because the flow path of the air flow in the guide ring 2 sequentially passes through the first wind guiding part 21, the second wind guiding part 22 and the third wind guiding part 23, the first wind guiding part 21 serves as an inlet guide arc to guide the air flow to flow into the guide ring 2, the third wind guiding part 23 serves as an outlet guide arc to guide the air flow to flow out of the guide ring 2, and the air flow has a velocity component pointing to the axis direction of the hub 12 (namely, radially inwards along the hub 12) when flowing towards the outlet guide arc in the inlet guide arc, so that the air flow can inhibit the flow of the air flow flowing from the pressure surface of the blade 11 to the blade top, thereby preventing the air flow from generating vortex and blade top leakage at the joint of the first arc section 1131 and the second arc section 1132, so as to reduce the leakage of air flow at the top of the blade when the fan is out; When the airflow enters the third wind guiding part 23 with a horn mouth shape, the airflow has a velocity component radially outwards along the hub 12 when flowing in the outlet guide arc, so that the airflow is radially outwards diffused along the hub 12 at the third wind guiding part 23 to leave the guide ring 2, and the air pressure of the airflow is reduced, so that no airflow leakage occurs. In this way, the guide wing structure 13 is arranged at the joint of the first arc-shaped section 1131 and the second arc-shaped section 1132 in the area surrounded by the first air guiding part 21, so that the leakage amount of air flow at the top of the blade 11 when the fan outputs air is further reduced, and the air output of the fan is ensured. In addition, since the connection position of the first arc-shaped section 1131 and the second arc-shaped section 1132 is located in the area surrounded by the first air guiding part 21, most of the first arc-shaped section 1131 is located outside the area surrounded by the first air guiding part 21, and the air flow inside the outdoor unit and the blade 1 have larger contact area, so that the blade 1 can drive more air flow to blow out of the outdoor unit through the guide ring 2; In the direction opposite to the rotation direction of the hub 12, the second arc-shaped section 1132 with the gradually increased curvature radius is arranged in the guide ring 2, and in the direction from the suction surface to the pressure surface of the blade 11, the distance between the second arc-shaped section 1132 and the inner wall of the guide ring 2 is gradually increased, so that the air outlet channel of the fan has a larger volume, and the air outlet quantity of the fan is improved.
Alternatively, as shown in fig. 6 and 7, the front projection of the first wind guiding portion 21 on a plane parallel to the axis of the hub 12 has two sections of circular arcs, and the two sections of circular arcs are respectively located at two ends of the front projection of the first wind guiding portion 21 in the direction perpendicular to the axis of the hub 12; the ratio of the perpendicular distance from the connection position of the first arc-shaped section 1131 and the second arc-shaped section 1132 to the end surface of the first air guiding part 21 far from the second air guiding part 22 to the radius of the arc is between 0.1 and 0.9.
The first wind guiding part 21 is horn mouth-shaped, the vertical distance from the connection position of the first arc section 1131 and the second arc section 1132 to the end face of the first wind guiding part 21 far away from the second wind guiding part 22 is equal to the ratio of the radius R of the end arc of the orthographic projection of the first wind guiding part 21 on the plane parallel to the axis of the hub 12 to 0.1-0.9, so that the connection position of the first arc section 1131 and the second arc section 1132 is positioned in the area surrounded by the first wind guiding part 21, when the air flow enters the guide ring 2 by abutting against the inner wall of the first wind guiding part 21, the air flow has a radial speed flowing towards the position of the hub 12, so that the guide wing structure 13 can further guide the air flow on the pressure surface of the blade 11 to balance the rotating centrifugal force of the air flow, the air flow on the pressure surface of the blade 11 is further blocked from the outer edge 113 to the side of the suction surface, the leakage quantity of the air flow at the top of the blade is reduced, the air outlet quantity of the fan is reduced, the air outlet quantity loss of the fan is reduced, the vortex noise of the blade top of the fan is reduced, and the wind guiding efficiency of the blade top is improved.
The invention also provides an air conditioner which comprises the axial flow fan blade 1 and/or the fan assembly.
According to the air conditioner, the axial flow fan blade 1 and the guide ring 2 which are coaxially arranged are arranged on the fan assembly, and the guide wing structure 13 is arranged on the pressure surface of the blade 11 of the axial flow fan blade 1 so as to inhibit the radial outward speed component of the air flow flowing from the pressure surface of the blade 11 to the blade top along the hub 12, namely, the air flow is prevented from flowing along the hub 12 in the radial outward direction, so that the air flow flowing through the pressure surface of the blade 11 can be prevented from flowing back to the side of the suction surface of the blade 11 along the pressure surface, the leakage quantity of the air flow at the blade top during the air outlet of the fan is reduced, the air outlet loss of the fan is reduced, and the air outlet quantity of the fan is increased; also, the provision of the guide vane structure 13 weakens the strength of the tip leakage vortex generated due to the leakage of the air flow at the tip, thereby reducing the vortex noise at the tip.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims (15)

1. An axial flow fan blade (1) is characterized by comprising a hub (12), blades (11) and a guide wing structure (13), wherein the blades (11) are arranged around the hub (12); the two side surfaces of the blade (11) are respectively a suction surface and a pressure surface, and the guide wing structure (13) is convexly arranged at one end, far away from the hub (12), of the pressure surface; the blade (11) has an outer edge (113), the outer edge (113) being an edge portion of the blade (11) at an end remote from the hub (12); the guide wing structure (13) is connected with the outer edge (113); the extending direction of the guide wing structure (13) is opposite to the rotating direction of the hub (12), wherein the guide wing structure (13) is provided with a large end (131) and a small end (132), and the extending direction of the guide wing structure (13) is the direction from the large end (131) to the small end (132); the orthographic projection of the guide wing structure (13) on the blade (11) where the guide wing structure is positioned is wing-shaped; and the distance from the large end (131) to the outer edge (113) is smaller than the distance from the small end (132) to the outer edge (113).
2. The axial flow fan blade (1) according to claim 1, wherein the outer edge (113) comprises a first arc-shaped section (1131) and a second arc-shaped section (1132), and the direction from the first arc-shaped section (1131) to the second arc-shaped section (1132) is opposite to the rotation direction of the hub (12); and the curvature of the first arc-shaped section (1131) is smaller than that of the second arc-shaped section (1132), and the guide wing structure (13) is positioned at the joint of the first arc-shaped section (1131) and the second arc-shaped section (1132).
3. The axial flow fan blade (1) according to claim 2, wherein a vertical distance from the first arc-shaped section (1131) to the axis of the hub (12) is a constant value, and a vertical distance from the second arc-shaped section (1132) to the axis of the hub (12) gradually decreases from a connection point of the second arc-shaped section (1132) and the first arc-shaped section (1131) to a position of the second arc-shaped section (1132) away from the connection point.
4. The axial flow fan blade (1) according to claim 2, wherein an included angle between a connecting line between the large end (131) and the small end (132) and a tangent line at a connection position of the first arc-shaped section (1131) and the second arc-shaped section (1132) is less than or equal to 30 °.
5. The axial flow fan blade (1) according to claim 2, characterized in that the ratio of the distance from the large end (131) to the small end (132) of the guide vane structure (13) to the arc length of the outer edge (113) of the blade (11) where the guide vane structure (13) is located is between 0.02 and 0.2.
6. The axial flow fan blade (1) according to claim 2, characterized in that the ratio of the protruding height of the guiding wing structure (13) to the thickness of the blade (11) at the junction of the first arc-shaped section (1131) and the second arc-shaped section (1132) is comprised between 0.5 and 2; wherein the thickness of the blade (11) is the perpendicular distance between the suction surface and the pressure surface.
7. The axial flow fan blade (1) according to claim 2, wherein the blade (11) further has a trailing edge (111), the trailing edge (111) is an edge portion of the blade (11) opposite to the rotation direction of the hub (12), one end of the trailing edge (111) is connected to the hub (12), and the other end is connected to the second arc segment (1132); the guide wing structure (13) is provided with a plurality of guide wing structures (13), the plurality of guide wing structures (13) are all located between the junction of the first arc-shaped section (1131) and the second arc-shaped section (1132) and the junction of the trailing edge (111) and the outer edge (113), and the plurality of guide wing structures (13) are distributed at intervals along the rotation direction of the hub (12).
8. The axial flow fan blade (1) according to claim 7, wherein an included angle of a perpendicular line between the large end (131) or the small end (132) of two adjacent guide wing structures (13) and the axis of the hub (12) is greater than or equal to 10 ° and less than or equal to 30 °.
9. The axial flow fan blade (1) according to any one of claims 2 to 8, wherein the blade (11) further has a front edge (112), the front edge (112) is an edge portion of the blade (11) having the same rotation direction as the hub (12), one end of the front edge (112) is connected to the hub (12), and the other end is connected to the first arc segment (1131); and the leading edge (112) has a line shape that is the most rapidly decreasing line shape.
10. The axial fan blade (1) according to claim 9, wherein an XY coordinate system is established on a plane perpendicular to the axis of the hub (12), a straight line where a line connecting both ends of the leading edge (112) is located is an X-axis, a straight line perpendicular to the X-axis and passing through an end of the leading edge (112) connected to the hub (12) is a Y-axis, and a linear equation of the leading edge (112) is:
，；
Wherein, As the coefficient of the light-emitting diode,For the distance between the two ends of the leading edge (112) on the X-axis,Is the angle between the X axis and the line between the point on the leading edge (112) and the origin of the XY coordinate system,For the vertical distance of the point on the leading edge (112) to the Y-axis,Is the perpendicular distance from the point on the leading edge (112) to the X-axis.
11. The axial fan blade (1) according to claim 9, characterized in that the front projection of the connection of the leading edge (112) with the first arc-shaped section (1131) on a plane perpendicular to the axis of the hub (12) is circular or elliptical.
12. A fan assembly, characterized by comprising a guide ring (2) and an axial flow fan blade (1) according to any one of claims 1-11, the axial flow fan blade (1) being coaxially arranged with the guide ring (2); the air flow flowing into the air guiding ring (2) flows in from the first air guiding part (21) and flows out from the third air guiding part (23), the first air guiding part (21) is far away from the inner diameter of the end part of the second air guiding part (22) and the inner diameter of the end part of the third air guiding part (23) is far away from the second air guiding part (22) are both larger than the inner diameter of the second air guiding part (22).
13. The fan assembly of claim 12, wherein the blade (11) has an outer edge (113), the outer edge (113) including a first arcuate segment (1131) and a second arcuate segment (1132), the junction of the first arcuate segment (1131) and the second arcuate segment (1132) being located within the area enclosed by the first air guide (21).
14. The fan assembly according to claim 13, wherein the first wind guiding portion (21) is bell-mouth shaped, and an orthographic projection thereof on a plane parallel to the axis of the hub (12) has two circular arcs, and the two circular arcs are respectively located at two ends of the orthographic projection of the first wind guiding portion (21) in a direction perpendicular to the axis of the hub (12); the ratio of the vertical distance from the connection part of the first arc-shaped section (1131) and the second arc-shaped section (1132) to the end surface of the first air guiding part (21) far away from the second air guiding part (22) to the radius of the circular arc is between 0.1 and 0.9.
15. An air conditioner comprising an axial flow fan blade (1) according to any one of claims 1-11 and/or a fan assembly according to any one of claims 12-14.
CN202010337597.4A 2020-04-26 2020-04-26 Axial flow fan blade, fan assembly and air conditioner with same Active CN111441977B (en)

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CN114688049B (en) * 2020-12-25 2024-02-20 广东美的白色家电技术创新中心有限公司 Fan assembly and air conditioner
CN113757171B (en) * 2021-10-13 2023-08-25 珠海格力电器股份有限公司 Blade assembly, axial flow fan and design method of small blade tip wing
CN115264599B (en) * 2022-08-04 2024-07-19 珠海格力电器股份有限公司 Fan and air conditioner

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